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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
Solderless 800-pin Breadboard
Solderless 800 tie-point breadboard for larger circuits.
G.Skill Trident Z5 RGB 32 GB (2×16) DDR5 6000
Sweet-spot AM5 kit at 6000 MT/s, CL30. Tall RGB heatspreader — check clearance with large air coolers.
Only 2 leftKingston Fury Renegade 64 GB DDR5-6000 (single)
64 GB DDR5 stick, 6000 MT/s, CL32. For workstations / VMs / large datasets — pair two for 128 GB total.
Out of stockAudio-Technica ATH-M50x
Studio reference closed-back, 45mm large-aperture drivers. Pro mixing standard.
KLEVV FIT V 16GB 5600MHz CL30 DDR5 Gaming Desktop RAM
[Memory] KLEVV FIT V 16GB 5600MHz CL30 DDR5 High-Performance Desktop Memory Low-profile high-speed DDR5 memory built with SK Hynix premium DRAM dies. Features low latency CL30 timings, pure aluminum heat spreader, and on-die ECC error correction. ⭐ Key Features - SK Hynix Original DRAM ICs for maximum stability and overclocking headroom - Ultra-low 33mm module height fits under any large dual-tower air cooler - Intel XMP 3.0 & AMD EXPO one-click overclock profiles - On-die ECC (ODECC) for data integrity 📋 Technical Specifications - Capacity: 16GB (1x 16GB) - Speed: DDR5 5600 MHz - Latency: CL30-36-36-76 - Voltage: 1.25V - Form Factor: 288-Pin DDR5 UDIMM 📦 Package Includes - 1 x KLEVV FIT V 16GB DDR5 5600MHz RAM Module
26650 Battery Holder / Battery Spacer 2×1 – 26.3mm Bore Diameter
[Lithium Battery Holder] 26650 Battery Holder / Battery Spacer 2×1 – 26.3mm Bore Diameter The 26650 Battery Holder / Battery Spacer 2×1 is a cylindrical battery spacer designed to securely arrange 26650 lithium-ion battery cells while building multi-cell battery packs. Made from flame-retardant ABS+PC material, it provides a strong and stable structure while allowing air circulation around the cells. The holder features interlocking slots on the edges, allowing multiple spacers to be joined together to create different battery-pack sizes and configurations. After welding nickel strips, the assembled battery pack can achieve a solid and reliable structure without requiring additional connecting hardware. ⭐ Key Features Designed for 26650 cylindrical lithium-ion cells 2 × 1 configuration 26.3mm bore diameter Made from flame-retardant ABS+PC material High-temperature resistant construction Crack-resistant design Interlocking slots for connecting multiple spacers Allows flexible battery-pack configurations Provides mechanical support for battery cells Helps maintain proper spacing between cells Suitable for high-current battery-pack construction Helps improve battery-pack stability and reliability Allows airflow around the cells for heat dissipation 📋 Technical Specifications Product Type: Battery Holder / Battery Spacer Compatible Cell: 26650 cylindrical battery Configuration: 2 × 1 Number of Cells: 2 Bore Diameter: 26.3mm Material: Flame-retardant ABS+PC Construction: Interlocking modular design Mounting: Multiple spacers can be joined together Application: Lithium battery pack assembly Cell Type: Cylindrical Li-ion cells 🔧 Applications 26650 lithium-ion battery packs E-bike battery packs Electric scooter battery packs Electric vehicle battery packs Power-tool battery packs DIY high-current battery packs UPS battery systems Solar energy storage packs Portable power stations Robotics battery packs Custom lithium battery assemblies 🛠️ How to Use The spacer is designed to hold two 26650 cells in a 2×1 arrangement. Multiple spacers can be connected through the slots provided around the edges to create larger battery-pack configurations. For a complete battery pack: Cell → Spacer → Nickel Strip Welding → Additional Spacers → Battery Pack For mechanical support, spacers can be positioned at the top and bottom of the cells. Important: For each individual battery cell, 2 spacers are recommended—one at the top and one at the bottom. 💡 Advantages Simple Assembly: Easy to arrange cylindrical cells. Flexible Design: Multiple spacers can be interconnected to create different pack shapes. Strong Construction: Helps keep cells firmly positioned. Heat Dissipation: Provides spacing between cells and allows airflow. Reliable Battery Pack: Helps make the completed pack mechanically stable. Suitable for Complex Packs: Useful for custom battery configurations, including e-bike and high-current applications. ⚠️ Important Notes This product is only a battery holder/spacer; batteries are not included. The 26.3mm bore is intended for compatible 26650 cells. Check your actual cell diameter before purchase. Do not force oversized cells into the holder. Battery cells should be properly insulated and securely assembled. Use suitable nickel strip and an appropriate spot-welding method. Use a suitable BMS/protection system for the completed lithium battery pack. Battery cells should be properly matched before assembling a multi-cell pack. 2 spacers are recommended per individual cell, one on each end. Keep the battery assembly away from excessive heat, moisture and physical damage. 📦 Package Includes 1 × 26650 Battery Holder / Battery Spacer – 2×1, 26.3mm Bore Diameter Note: Battery cells, nickel strips and BMS are not included.
UPS Rocker Switch Red 6 Pin ON-OFF-ON with Indicator
[Mechanical Switches] UPS Rocker Switch Red 6 Pin ON-OFF-ON with Indicator – BR34 The UPS Rocker Switch Red 6 Pin ON-OFF-ON with Indicator (BR34) is a durable rocker switch designed for reliable switching applications. It features a 6-pin DPDT configuration, copper contacts and a large rocker design with an indicator light for convenient operation and status indication. With a rated voltage of up to 250V and a rated current of 6A, it is suitable for UPS systems, power strips, stabilizers, water dispensers, coffee machines, automobiles, USB hubs, machinery and other electrical equipment. ⭐ Key Features 6-pin rocker switch ON-OFF-ON switching function DPDT switch configuration Red color Built-in indicator Copper contact construction Illuminated design Large rocker size Rated current up to 6A Rated voltage up to 250V Durable construction Suitable for panel-mount applications Indicator helps provide visual switching/status indication 📋 Technical Specifications Model: BR34 Switch Type: Rocker Switch Switch Function: ON-OFF-ON Number of Pins: 6 Switch Throw Type: DPDT Rated Voltage: 250V Rated Current: 6A Illuminated: Yes / With Indicator Indicator: Built-in indicator Contact Plating: Copper Material: Copper and Iron Color: Red Size: Big Rocker Mechanical Life: Up to 5 years Mounting: Panel Mount Application: Electrical and electronic equipment 🔧 Applications UPS systems Power strips Voltage stabilizers Water dispensers Coffee machines Automobiles USB hubs Electrical machinery DIY electrical projects Control panels Power switching applications 🛠️ Installation Ensure the power supply is switched OFF before installation. Identify the correct terminals according to the required DPDT switching configuration. Connect the wires securely to the appropriate terminals. Ensure the connected load does not exceed the 6A rated current. Mount the switch firmly into the appropriate panel cutout. Verify the indicator wiring and rating before connection. 📦 Package Includes 1 × UPS Rocker Switch Red 6 Pin ON-OFF-ON with Indicator Model: BR34 ⚠️ Precautions Do not exceed the rated 250V / 6A specification. Switch OFF the power supply before installation or wiring. Ensure proper insulation of all electrical connections. Use suitable wiring according to the connected load. Verify the indicator voltage specification before connecting it to the circuit. Verify the pin configuration before connecting the switch. Do not directly connect the indicator to a voltage for which it is not rated.
UPS Rocker Switch Black 6 Pin ON-OFF-ON
[Mechanical Switches] UPS Rocker Switch Black 6 Pin ON-OFF-ON – BR34 The UPS Rocker Switch Black 6 Pin ON-OFF-ON (BR34) is a durable rocker switch designed for reliable switching applications. It features a 6-pin DPDT configuration, copper contacts and a large rocker design for convenient operation. With a rated voltage of up to 250V and a rated current of 6A, it can be used in power strips, stabilizers, water dispensers, coffee machines, automobiles, USB hubs, machinery and other electrical equipment. ⭐ Key Features 6-pin rocker switch ON-OFF-ON switching function DPDT switch configuration Black color Copper contact construction Non-illuminated design Large rocker size Rated current up to 6A Rated voltage up to 250V Durable construction Suitable for panel-mount applications 📋 Technical Specifications Model: BR34 Switch Type: Rocker Switch Switch Function: ON-OFF-ON Number of Pins: 6 Switch Throw Type: DPDT Rated Voltage: 250V Rated Current: 6A Illuminated: No / Non-Illuminated Contact Plating: Copper Material: Copper and Iron Color: Black Size: Big Rocker Mechanical Life: Up to 5 years Mounting: Panel Mount Application: Electrical and electronic equipment 🔧 Applications UPS systems Power strips Voltage stabilizers Water dispensers Coffee machines Automobiles USB hubs Electrical machinery DIY electrical projects Control panels Power switching applications 🛠️ Installation Ensure the power supply is switched OFF before installation. Identify the correct terminals according to the required DPDT switching configuration. Connect the wires securely to the appropriate terminals. Ensure the connected load does not exceed the 6A rated current. Mount the switch firmly into the appropriate panel cutout. 📦 Package Includes 1 × UPS Rocker Switch Black 6 Pin ON-OFF-ON ⚠️ Precautions Do not exceed the rated 250V / 6A specification. Switch OFF the power supply before installation or wiring. Ensure proper insulation of all electrical connections. Use suitable wiring according to the connected load. This is a non-illuminated switch. Verify the pin configuration before connecting the switch to your circuit.
3-in-1 Aluminum Heat Sink Set for Raspberry Pi 3
[Aluminium Heat Sink] ❄️ 3-in-1 Aluminum Heat Sink Set for Raspberry Pi 3 High-Quality Aluminum • Self-Adhesive Thermal Tape • Improved Cooling • Easy Installation The 3-in-1 Aluminum Heat Sink Set for Raspberry Pi 3 is a premium cooling accessory designed to improve heat dissipation and maintain stable operating temperatures for Raspberry Pi boards. Manufactured from high-quality aluminum, these heat sinks efficiently transfer heat away from critical components, helping improve performance and extend the life of your Raspberry Pi. The kit includes three aluminum heat sinks of different sizes to cool the processor, Ethernet/LAN controller, and other heat-generating ICs. Each heat sink comes pre-installed with a high-performance thermal adhesive backing, allowing quick and secure installation without the need for additional thermal paste or glue. By reducing operating temperatures, the heat sinks help prevent thermal throttling during continuous operation, making them ideal for overclocking, media centers, home servers, IoT applications, industrial automation, and embedded systems. ⭐ Features Premium-quality aluminum construction Excellent thermal conductivity Self-adhesive thermal tape for easy installation No thermal paste required Lightweight and durable Improves heat dissipation Reduces processor temperature Helps prevent thermal throttling Ideal for continuous operation and overclocking Designed specifically for Raspberry Pi boards Corrosion-resistant aluminum finish Easy peel-and-stick installation 📋 Technical Specifications Product Type: Aluminum Heat Sink Set Compatibility: Raspberry Pi 3 Model A, A+, B, B+ Material: Aluminum Color: Silver Quantity: 3 Heat Sinks Mounting Method: Self-Adhesive Thermal Tape Thermal Interface: Pre-applied Thermal Adhesive Cooling Type: Passive Cooling Weight: Lightweight Installation: Peel-and-Stick 🔧 Applications Suitable for: Raspberry Pi 3 Model B Raspberry Pi 3 Model B+ Raspberry Pi 3 Model A+ Raspberry Pi 3 Model A Raspberry Pi Media Center Home Automation Projects IoT Devices Embedded Systems Robotics Projects Industrial Controllers NAS Servers Retro Gaming Consoles AI Edge Computing Educational Projects DIY Electronics 📦 Package Includes 1 × Large Aluminum Heat Sink (CPU) 1 × Medium Aluminum Heat Sink (LAN/Ethernet Controller) 1 × Small Aluminum Heat Sink (Additional IC / Spare)
Out of stock146074 3.7V 10000mAh Rechargeable Lithium Polymer (Li-Po) Battery Cell for Power Bank & Electronic Devices
[LiPo Cell] The 146074 3.7V 10000mAh Lithium Polymer Rechargeable Battery Cell is a high-capacity flat Li-Po battery designed for portable electronic devices and power bank applications. With a large 10000mAh capacity, it provides long-lasting power while maintaining a compact and lightweight design. This lithium polymer cell is widely used in DIY power banks, Bluetooth speakers, tablets, GPS devices, IoT systems, portable electronics, and backup power systems. The battery includes protection circuitry compatibility and provides stable voltage output for reliable performance in demanding applications. 🔹 Key Features High capacity 10000mAh lithium polymer battery Nominal voltage 3.7V Lightweight and compact flat design Rechargeable Li-Po chemistry High energy density Stable discharge performance Suitable for portable electronics and DIY power banks 🔹 Technical Specifications Battery Type: Lithium Polymer (Li-Po) Model: 146074 Nominal Voltage: 3.7V Fully Charged Voltage: 4.2V Rated Capacity: 10000mAh Actual Capacity: 90-92% of Rated Capacity Cell Type: Flat pouch cell Charging Method: CC-CV (Constant Current / Constant Voltage) Charge Voltage: 4.2V Discharge Cut-off Voltage: 3.0V Rechargeable: Yes 🔹 Applications Power banks DIY battery packs Bluetooth speakers Portable electronics IoT devices GPS devices Tablets and handheld devices Backup power systems ⚠ Safety Instructions Do not short circuit battery terminals. Do not overcharge above 4.2V. Do not discharge below 3.0V. Use only compatible Li-Po charger or protection board. Do not puncture or expose battery to fire or heat. Do not charge unattended. Store in a cool and dry place. 🔹 Package Includes 1 × 146074 3.7V 10000mAh Lithium Polymer Battery Cell ⚠ Battery color and label may vary depending on stock batch.
7S 20A BMS for 18650 Lithium-Ion Battery Pack – Protection Board with Connector
[Lithium Battery Protection Board] The BMS NMC 7S 20A Same Port is an advanced Battery Management System designed for high-performance 25.9V lithium NMC battery packs. Engineered with integrated protection features and a compact PCB layout, this BMS offers robust electrical safety while minimizing design complexity with its single port for both charging and discharging. This Data sheet is for Lichtronics 7S 20A NMC PCM/BMS Charging Voltage -DC:29.4-30V CC/CV Max continuous charging current – 20A Over charge detection voltage – 4.25±0.05V Over discharge detection voltage – 2.8±0.08V Over current detection current – 40A Operating Temperature -45°C –+65°C Storage Temperature -45°C — +85°C Product Data Sheet Key Features Same Port Design: Combines charging and discharging through a single port for streamlined connections. 20A Continuous Discharge: Supports mid-range power devices with stable performance. Multiple Safety Protections: Overcharge Protection Over-discharge Protection Overcurrent & Short Circuit Cut-off Temperature Detection Passive Balancing: Ensures equal charge across cells for longer battery life. Compact and Lightweight Design: Ideal for tight enclosures or portable builds. Connector Included: Easily connect to standard 7S battery configurations. Technical Specifications Specification Details Battery Chemistry Lithium NMC (3.7V/cell) Configuration 7S (7 Cells in Series) Nominal Voltage 25.9V Charge Cut-off Voltage 29.4V (4.2V per cell) Discharge Cut-off ~17.5V (2.5V per cell) Max Continuous Current 20A Port Type Same port for charge/discharge PCB Size Compact footprint Balance Current 30-60 mA Applications Electric Bikes & Scooters Solar Lighting & Backup Power Portable DIY Power Systems Battery Replacements & Packs Energy Storage & IoT Solutions The PCM NMC 07S/20A SAME PORT (SLCT) is a Protection Circuit Module (PCM) designed for lithium nickel manganese cobalt (NMC) battery packs configured in a 7-series (07S) setup. This module provides overcharge, over-discharge, overcurrent, and short-circuit protection to safeguard the battery and enhance its lifespan. It is rated for a maximum continuous current of 20A, allowing higher current flow for larger applications. The "SAME PORT" feature suggests that both charging and discharging can occur through the same port, simplifying the battery management system. The "SLCT" (selectable) feature likely refers to adjustable settings for specific battery configurations or protections. 📦 Package Includes 1 × 7S 20A BMS Protection Board (with connector)
High Temperature Kapton Tape 50mm 33 Mtr – Premium Polyimide Insulation Tape up to 300°C
[Kapton Tapes] The High Temperature Kapton Tape 50mm x 33M – Premium Polyimide Insulation Tape up to 300°C is a professional-grade heat-resistant tape designed for demanding industrial, electronics, and engineering applications. Manufactured from high-quality polyimide film with a silicone adhesive, this tape delivers outstanding thermal stability, chemical resistance, and electrical insulation—making it an essential tool for soldering, 3D printing, lithium battery assembly, transformer insulation, and PCB wave solder masking.With a broad temperature tolerance reaching up to 300°C, this Kapton tape ensures secure performance without melting, shrinking, or leaving residue. Its 50mm width and long 33-meter roll provide excellent coverage for large surfaces, making it ideal for laboratories, manufacturing units, repair technicians, and DIY electronics enthusiasts. ✅ Features: Premium polyimide Kapton tape with silicone adhesive High temperature resistance up to 300°C Excellent for PCB solder masking, 3D printer heated beds, and battery insulation Provides strong electrical insulation and chemical stability Leaves no residue when removed after heating Ideal for industrial, laboratory, and DIY electronics Tear-resistant, flame-retardant, and long-lasting performance 50mm wide and 33-meter roll for large-area insulation and protection Package Includes: 1 x High Temperature Kapton Tape 50mm 33 Mtr – Premium Polyimide Insulation Tape up to 300°C
TPA3116D2 XH-M543 120W Dual Channel High Power Original Digital Power Amplifier Board
[Amplifier Board] Build your own music system with 120 watts of stereo output. TPA3116D2 XH-M548 Dual Channel 120W Digital Power Amplifier Board is newly designed digital audio amplifier board with fine quality is practical to install and use also has good performance. It features high-efficiency class D audio power amplifier with the latest and original TPA3116D2 core technology the BTL bridge circuit is more efficient than before. This product uses the double power supply transformer with a dynamic power supply range from 12V to 24V with high efficiency small quiescent current. Additionally, it is equipped with Perfect protection functions like overvoltage protection and output current limit. Features: A strong TPA3116D2 chip is a digital power amplifier chip, with low idle loss characteristics, makes it work well and quickly. Onboard, front-facing IC to improve the input sensitivity, high-definition sound quality. It can be used for car vehicle computer speaker, family audio and video, and empty square. This product has the characteristics of loud sound, the capacitance is large, excellent sound quality. There is no solder joint on the back of the circuit board, the chip capacitors, and the solder board together, so there is no possibility of short circuit. Package Includes: 1 x TPA3116D2 XH-M543 120W Dual Channel High Power Digital Power Amplifier Board
Kapton 25mm x 33m High Temperature Resistant Tape
[Kapton Tapes] Kapton tape is a polyimide film first developed by DuPont in the 1960s. It remains stable at an extremely wide range of temperatures from -269˚C to 260˚C and has been an industry-standard due to its excellent electrical, thermal, chemical and mechanical properties. This enables the film to withstand extreme temperatures, vibration, and other demanding environments. This Kapton 50mm x 33m High-Temperature Resistant Tape for 3D Printers is a polyester film tape with a high-temperature resistant adhesive. Primarily used to hold transfer sheets in place while sublimating onto a variety of items and hold the polymer plate on the heating platen in the hot foil stamping. Excellent heat & solvent resistance. Minimal shrinkage after baking and clean removal. Due to Kapton tape’s large range of temperature stability and electrical isolation ability, it is used during the manufacturing and final assembly of electronic components. It acts as a protective layer that isolates and prevents the electrostatic discharge of sensitive components, also protecting and restraining components during high temp applications and reflow soldering procedures. ABS and Kapton adhere extremely well to one another, making Kapton tape a perfect 3D printing bed surface layer. It is usually applied to a glass or aluminum bed surface, where extruded ABS filament adheres to the surface. Specification and Features: Material: Polyimide Spindle Type: Roll Tape Length: 33m TapeWidth: 25mm Colour: Metallic Brown Temperature Range: 200ºC High-quality product from a well-known brand Package Includes: 1 x Kapton 25mm x 33m High-Temperature Resistant Tape for 3D Printers Note: Product Images are shown for illustrative purposes only and may differ from the actual product
Crocodile Alligator Clip 50 mm Black and Red
Description: An alligator clip, also called a spring clip, creates a temporary electrical connection using a simple mechanical design.It gets its name because the jaws resemble an alligator or crocodile’s mouth, opening and closing to grip objects securely.The clip works like a spring-loaded clothespin that uses tapered, serrated jaws to hold wires or metal parts tightly.A spring pushes the jaws together, allowing the clip to grip objects and maintain a reliable electrical connection.Manufacturers design these clips for electronics testing, enabling quick connections without soldering or permanent joints.One jaw usually connects to a wire by crimping or soldering for efficient current transfer.Some clips use a bent jaw forming the inner contact of a 15 mm to 4 mm female banana jack.This design allows a fast, non-permanent connection between test circuits and laboratory instruments.A plastic cover or boot surrounds the clip to prevent short circuits and protect users from accidental shocks.Engineers and students use these clips widely in testing, prototyping, and educational experiments. Applications: Technicians use small clips (15 mm–40 mm) in electrical laboratories, schools, and college labs for quick test connections.Large clips, called automotive clips or battery clamps, use solid copper for low resistance and strong current flow.Users connect these large clips with thick insulated copper cables between automobile batteries or heavy electrical systems.Hobbyists and professionals rely on these clips for safe, reusable, and efficient electrical connections. Product Example: Check the Crocodile Alligator Clip 50 mm – Red and Black, made from durable stainless steel with a protective plastic shroud.Its spring-loaded jaws open wide to grip different wire sizes securely during testing or circuit connection.The serrated teeth ensure a strong, slip-free grip that maintains stable electrical contact during operation. Package Includes: 1 × Crocodile Alligator Clip 50 mm (Black and Red)
Wuzhi Audio ZK-MT21 Bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W 2.1 Channel Power Audio Stereo Amplifier Tone Board Bass AMP AUX
[Amplifier Board] Tip: Only when the audio input is sufficient and the power supply voltage/current is sufficient, there will be sufficient output power. The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power. Please make sure that the power of the adapter power supply is greater than the actual working power of the amplifier! You can check our others amplifier boards here. FAQ: 1. How to choose a power supply? The power supply with the board is very important. The ripple of the selected power supply must be small. A power supply with a large ripple will cause the bottom noise of the power amplifier board to become larger and there will be current noise. The higher the voltage, the greater the current, and the more adequate the output power. The power supply is 12V1A and can be equipped with 3-4inch speakers. If it is above 19V 5A, there is no problem with 8-10 inches, and the power supply must be highly regarded. If the voltage is too low, the amplified sound will easily cause sound distortion. If the current is too low, the speaker will pull down the voltage, which will result in abnormal operation or poor sound quality. It is recommended to use a power supply of 18V19V24V with a current above 5A. If you only have 9V12V or 1A 2A power supply, it can be used but the power is low. When the volume is selected close to the maximum, it may be distorted and affect the sound quality. 2. How to choose a speaker? Regarding speaker types: commonly used speakers are generally 4-8 ohms, which can be used. The left and right channel speakers need to be connected to full-range speakers or mid- to high-frequency speakers, and the power is between 20W-100W. The subwoofer speaker cannot be connected to an ordinary speaker, and a speaker with a subwoofer speaker must be connected with a power between 20-100. The dive frequency of the subwoofer speaker must be at least 50 Hz. If your speaker has a low power, such as between 20W-50W, it can be used. You need a lower power supply voltage to prevent the speaker from burning after amplifying the sound. For example, choose a power supply below 15V. If you are a 50W-100W speaker, don't worry about the problem of speaker burnout. You can choose a 12-24V power supply. The higher the selected voltage, the greater the sound or power that can be output. The speaker power should not exceed 100W, otherwise it will affect the sound quality. 3. Introduction to audio input mode This audio power amplifier module has two audio input methods: one is Bluetooth input, the other is AUX input, Bluetooth mode is preferred. Bluetooth can be connected in any mode. As long as the Bluetooth connection is successful, it is in Bluetooth mode, and the Bluetooth mode supports automatic connection back. When Bluetooth is not connected, AUX plug-in is in AUX mode. It should be note that when using AUX mode, you need to confirm that the Bluetooth connection of this module has been disconnected. 4. How to adjust the main volume? The MAIN—VOLUME knob adjusts the main volume. Right-handed main volume increases, left-handed main volume decreases. The main volume affects the volume of the left and right channels and the subwoofer. 5. How to adjust the left and right channel high and low sounds? The R&L CHANNEL—BASS knob controls the bass, right-turning bass enhancement, left-turning bass attenuation. When the knob is in the rightmost position, the bass is neither enhanced nor attenuated. The R&L CHANNEL—TREBLE knob controls the treble, the right-handed treble is enhanced, and the left-handed treble is attenuated. When the knob is in the middle position, the high pitch is neither enhanced nor attenuated. Note when adjusting the treble and bass: when the treble or bass is adjusted to the maximum by turning right, if the sound is distorted, the gain of the treble or bass adjustment is too large. You need to turn the treble or bass knob to the left to lower the gain or turn the right Turn the MAIN-VOLUME knob to the left to reduce the total volume. 6. How to adjust the subwoofer? SUBWOOFER—VOLUME knob is used to control the volume of the subwoofer. Right-handed volume increases, and left-handed volume decreases. The SUBWOOFER—FREQ knob controls the cutoff frequency of the subwoofer. The right-hand frequency increases, and the left-hand frequency decreases. The frequency adjustment range is 20HZ-200HZ. 7. The voice is small and okay. When the voice becomes louder, the voice becomes muddy? The sound is distorted, please turn down the total volume or change to a higher voltage adapter power supply. 8. The sound is small, but when the sound becomes louder, the sound freezes? If the input power is insufficient, the power supply itself is protected against intermittent power failure. Please replace it with a higher-power power supply; or if the power is too large, the power amplifier board will generate serious heat and thermal protection has occurred. Reduce power usage or enhance heat dissipation. 9. What factors are related to the sound quality? The sound quality is not only related to the power amplifier module, but also related to the power supply, sound source, and the entire audio system. Basically, every aspect of the audio system will affect the sound quality, among which the main links are the audio transmission line, the audio power supply, the tone circuit, the power amplifier circuit, the speakers and the surrounding environment. The sound quality is the best only when the sound source, power supply, amplifier module and speakers are matched. Feature: Product Name: 2.1 channel audio amplifier module Product Model: ZK-MT21 Bluetooth Version: 5.0 (no shielding, 15 meters) Input Sensitivity: 500mV Audio Input: AUX + Bluetooth Channel: 2.1 Chip Solution: Domestic power amplifier chip Power Range: DC 12-20 V / 5A above (Do not connect to 24V battery pack) Adapter Speaker: 20-100 W, 4-8 Ω Output Power: Left and right channels <50W, Subwoofer <100W Protection Mechanism: Anti reverse connection. Overheat. Overcurrent. Short circuit Product Dimensions: 93mm*90mm*22mm Package Weight : about 185g (packaging) Package Includes: 1 x ZK-MT21 bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W 2.1 Channel Power Audio Stereo Amplifier Tone Board Bass AMP AUX
16A 250V AC DPST ON-OFF Rocker Switch
[Mechanical Switches] This is a basic DPST ON-OFF Rocker Switch for your projects. No screws required, it simply clips into place. This is a two-pin switch that is easy to use, simply cut one of the two power wires and solder each of the ends to the unit. This 16A 250V AC DPST ON-OFF Rocker Switch is perfect for controlling power to electronic circuits, robots, etc. We have carefully selected the best On/Off Rocker Switch with a high load rating and the perfect size to for all general-purpose On/Off applications. This rocker switch has two positions – one on position and another off position. The rocker switch stays in the one till it is pressed and changed to the other position. It has two large pins on the backside to which wires can be soldered and connected to your circuit. The On/Off Rocker Switch is the simplest and easiest power control switch for your project. It comes with tabs on the top and bottom which secure it onto an enclosure without the need for any screws. On and Off positions are clearly marked which help users identify the current switch position during usage. This switch is great to turn on/off and control DC Motors in Robotics, Car and Motorcycle DC Motors, DC Motors in Industrial Machines, Water Dispensers, etc. We have sourced the best switch with a high load rating of 16A at 250VAC which should be suitable for most applications. Please note: 1. Switching Mode: ON-OFF 2. Structure: DPST Features: Positions Marked on the rocker: I, O (On and Off) for easy identification Long Switching Life: 50000-100000 cycles Easy installation, No Screws or Nuts required Used widely for on/off power control, car, motorcycle, boat, some machines, water dispenser, etc. Package Includes: 1 x 16A 250V AC DPST ON-OFF Rocker Switch
RS-775 DC 12V-24V High Speed Metal Large Torque 5000-10000 RPM DC Motor With Ball Bearing
[General DC Motor] Operating Voltage: 12V(Recommended Voltage is 12v, Although the motor can run on 24v but we don't recommend it using it on 24V) No-load Current: 0.6A Maximum Current: 2A No Load Speed RPM @12V: Approx ~5000/6000 RPM No Load Speed RPM @24V: Approx ~11000/12000 RPM Mounting Screw Hole Diameter: ~4 mm Distance between Screw Holes: ~33 mm Diameter of the Motor: 41mm(Without metal clip) Length of the Motor (Body): 67mm Length of shaft: ~16-20 mm(Veries with Every Lot but usually lies in this bracket) Motor Shaft Diameter: 5mm Main Color: Silver Tone Note: This is a generic DIY Motor, finishing, weight and size may vary in each stock. Product Images are shown for illustrative purposes only and may differ from the actual products. We suggest you buy a few quantities before going for bulk or contact customer support for current stock images. Note:- There is no surety of the presence of an inbuilt fan inside the motor body as it varies with every new stock and we ship it randomly according to availability.
Push Button SPST ON-OFF Switch RED
[Mechanical Switches] The Push Button SPST ON-OFF Switch (Red) is a durable and reliable panel mount power control switch designed for electrical and electronic circuits. It features a Single Pole Single Throw (SPST) configuration that allows users to easily turn a circuit ON or OFF using a simple push operation. This switch uses a non-momentary (latching) mechanism, meaning the switch stays in its current state until pressed again. When pressed once, the circuit turns ON, and when pressed again, it switches OFF. This makes it perfect for applications where continuous power control is required. With a rated voltage of 250V AC and current capacity of 3A, the switch is suitable for a wide range of electronics, DIY projects, robotics systems, power supplies, and industrial control panels. The switch is designed for panel mounting, allowing secure installation in enclosures, equipment housings, and control boxes. Its bright red button provides clear visibility and easy identification, while the compact size makes it suitable for both small and large electronic projects. This push button switch is widely used in DIY electronics projects, Arduino systems, industrial machines, appliances, and control circuits where a simple and reliable ON/OFF switching solution is needed. ⭐ Key Features SPST (Single Pole Single Throw) configuration Push ON / Push OFF latching mechanism Non-momentary push button switch Panel mount installation Compact and lightweight design Bright red actuator button Easy wiring with 2 pins Suitable for electronics, robotics, and industrial applications 🔧 Technical Specifications Rated Voltage: 250V AC Rated Current: 3A Number of Pins: 2 Switch Type: Non-Momentary Push Button Action Type: Push ON / Push OFF (Latching) Configuration Type: SPST (Single Pole Single Throw) Mounting Type: Panel Mount Button Color: Red Terminal Type: Pin / Solder Terminal 🎯 Applications DIY electronics projects Arduino and microcontroller circuits Robotics systems Industrial control panels Power supply switching Appliances and electrical devices Automation equipment 📦 Package Includes 1 × Push Button SPST ON-OFF Switch Red
1-Channel 5V Relay Module for Arduino
[Relays] This is 1 Channel 5V Relay Board Module For Arduino PIC AVR DSP ARM. A wide range of microcontrollers such as Arduino, AVR, PIC, ARM and so on can control it. Each one needs 15mA – 20mA driver current and Equipped with high current relay: DC 5V / 10A, AC 250V / 10A Standard interface that can be compatible with microcontroller. Specification and Features :- 1 channel 5v relay board Operating Voltage : 5V Max Current : 20mA Relay Contact Current Capacity at AC250V: 10A Relay Contact Current Capacity at DC5V: 10A One normally closed contact and one normally open contact Triode drive, increasing relay coil High impedance controller pin Pull-down circuit for avoidance of malfunction Power supply indicator lamp Control indicator lamp Indicator for Relay output status Can Be controlled various appliances & other Equipment With Large current. Standard TTL Level logic controlled (AVR, Arduino, 8051, PIC, ARM) The module is compliant with international safety standards, control and load areas isolation trenches; * Product Images are shown for illustrative purposes only and may differ from actual product.
Digital Multi Servo Tester ESC RC Consistency CCPM Master Speed Control
[Servo Motor] Digital Multi Servo Tester ESC RC Consistency CCPM Master Speed Control offers 3 modes to check servos or ESC. The Manual Mode allows you to turn the knob to different speeds and check the reaction time. The Neutral mode makes the servo go back to the neutral point. The Automatic ’’Window Wiper’’ Mode makes the servo swing like a window wiper in the largest angle possible. Plus, this servo tester can connect to up to 3 servos simultaneously. You can also connect up to 3 ESCs to test and compare their reaction time respectively. Click and order now! Operation Modes :- Automatic mode:- Operates servos to their end point and back “window wiper” mode: Make the servo swing like window wipers in the biggest angle Manual mode:- Turn the knob with different speed, check the reaction time Neutral / Center mode:- Centers servos to their neutral position Ideal for when setting servos up in a model Features of Digital Multi Servo Tester ESC RC Consistency CCPM Master Speed Control :- Digital Multi Servo Tester ESC RC Consistency CCPM Master Speed Control Operating Voltage: DC 4.8-6V Offer 3 modes to check servos or ESC The Manual Mode allows you to turn the knob to different speeds and check the reaction time The Neutral mode makes the servo go back to the neutral point The Automatic ’’Window Wiper’’ Mode makes the servo swing like a window wiper in the largest angle possible Connect to up to 3 servos simultaneously Connect up to 3 ESCs to test and compare their reaction time respectively Built with LED indicators Output signal: 1.5ms±0.5ms Size: 36.5 x 31.0 x 22mm
2 Channel 5V Relay Module with Optocoupler
[Relays] This is a 5V, 10A 2-Channel Relay interface board. It can be used to control various appliances, and other equipments with large current. It can be controlled directly with 3.3V or 5V logic signals from a microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic). It has a 1×4 (2.54mm pitch) pin header for connecting power (5V and 0V), and for controlling the 2 relays. The pins are marked on the PCB:- GND – Connect 0V to this pin. IN1 – Controls relay 1, active Low Relay will turn on when this input goes below about 2.0V IN2 – Controls relay 2, active Low Relay will turn on when this input goes below about 2.0V VCC – Connect 5V to this pin. Is used to power the opto couplers Specification:- High current relay, AC250V 10A, DC5V 10A 2 LEDs to indicate when relays are on Works with logic level signals from 3.3V or 5V devices Opto isolation circuitry * Product Images are shown for illustrative purposes only and may differ from actual product.
18650 Battery Spacer Holder 3×1 – High-Strength Lithium-Ion Cell Bracket for Pack Building
[Lithium Battery Holder] The 18650 3×1 Lithium-Ion Battery Cell Spacer Holder is a high-strength, durable cell bracket designed for building safe, stable, and professional-grade battery packs. This spacer securely holds three 18650 cells in a 3×1 configuration, ensuring proper spacing for heat dissipation, vibration resistance, and long battery life. Made from high-quality ABS material, the holder provides excellent insulation and structural stability, making it ideal for battery pack assembly in DIY projects, e-bikes, power banks, solar street lights, robotics, UPS systems, and energy storage projects.Perfect for spot welding setups, the modular design allows easy stacking and expansion to create larger battery packs with consistent alignment and safety. ✅ Features High-quality 3×1 spacer holder for 18650 lithium-ion cells Provides secure fit and stable structure for battery pack assembly Ensures proper spacing for heat dissipation and long cell life Made from durable, high-temperature ABS plastic Ideal for DIY battery packs, e-bikes, solar lights, power banks & UPS systems Perfect for spot welding and series/parallel battery configuration Modular design allows easy expansion for large battery packs Prevents cell movement, vibration damage, and short circuits Note: Battery is not included, you need to buy it separately. Package Includes: 1 x 18650 Battery Spacer Holder 3×1 – High-Strength Lithium-Ion Cell Bracket for Pack Building
Small Aluminium Heat Sink for TO-220 Package
[Aluminium Heat Sink] Small Aluminium Heat Sink for TO-220 Package The Small Aluminium Heat Sink for TO-220 Package is a compact passive cooling component designed for TO-220 package transistors, voltage regulators, MOSFETs, and other low-power semiconductor devices. It helps transfer heat away from the electronic component and dissipate it into the surrounding air, helping maintain a safer operating temperature. A matching product listing confirms that this heatsink is intended for low-power dissipation and includes a mounting hole for securing a transistor or voltage regulator. Its compact size makes it particularly useful where PCB space is limited. The heatsink is made from aluminium and has a 1mm material thickness, with overall dimensions of 15 × 9 × 19mm. ⭐ Key Features Designed for TO-220 package components Made from aluminium Compact and lightweight construction Suitable for low-power heat dissipation Helps reduce semiconductor operating temperature Mounting hole for securing compatible components Suitable for transistors, voltage regulators and similar devices Easy to install on electronic components Ideal for PCB and DIY electronics projects 📋 Technical Specifications Product Type: Aluminium Heat Sink Application: TO-220 Package Material: Aluminium Length: 15mm Width: 9mm Height: 19mm Thickness: 1mm Dimensions: 15 × 9 × 19mm Weight: Approximately 1g Mounting: Screw Mount Heat Dissipation: Passive / Natural Convection Application Type: Low-Power Semiconductor Cooling The dimensions and approximately 1g weight are listed by the corresponding product listing. 🔧 Applications TO-220 Transistors Voltage Regulators MOSFETs Power Transistors Linear Regulators Small Power Supply Circuits Arduino Projects DIY Electronics PCB Projects Embedded Electronics General Semiconductor Cooling 🛠️ Installation Place the heatsink against the heat-producing surface of the compatible TO-220 component and secure it through the mounting hole using an appropriate screw and nut. For improved thermal transfer, a suitable thermal interface material or thermal compound can be used between the component and heatsink where appropriate. Ensure that the heatsink does not accidentally create an electrical short between component terminals or other PCB traces. 📦 Package Includes 1 × Small Aluminium Heat Sink for TO-220 Package ⚠️ Precautions Use only with components that are mechanically compatible with the heatsink. Ensure the heatsink is securely mounted. Check for possible electrical contact between the heatsink and component terminals. Use thermal compound or an appropriate thermal interface where required. This is intended for low-power heat dissipation; higher-power applications may require a larger heatsink or forced-air cooling.