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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
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)
Passive Radiator Bass Diaphragm Rubber Speaker Vibration Plate for DIY Speakers
[Passive Radiator] 🔊 Oval, Square & Round Passive Radiator Bass Diaphragm Rubber Speaker Vibration Plate for DIY Speakers Deep Bass Enhancement • Passive Design • No External Power Required • Ideal for DIY Speaker Projects The Rubber Passive Radiator Bass Diaphragm is a high-quality auxiliary bass vibration plate designed to significantly improve the low-frequency response of speaker systems. Available in Oval, Square, and Round shapes with multiple sizes, this passive radiator enhances bass performance without requiring additional power or amplifier channels. Unlike conventional speakers, a passive radiator does not contain a voice coil or magnet. Instead, it utilizes the air pressure generated by the active speaker driver to vibrate, producing deeper, richer bass while minimizing distortion and unwanted cabinet resonance. Manufactured using premium rubber and durable ABS materials, these passive radiators provide excellent flexibility, durability, and long service life. They are ideal for upgrading Bluetooth speakers, portable speakers, multimedia speakers, subwoofers, soundbars, and custom DIY audio projects. Whether you're repairing an existing speaker or building a custom enclosure, these passive bass diaphragms help deliver powerful low-frequency performance while maintaining compact enclosure sizes. ⭐ Features Premium quality rubber passive radiator Available in Oval, Square & Round shapes Produces deep and powerful bass response No power supply or wiring required Improves low-frequency performance Reduces speaker distortion Durable rubber suspension Lightweight and compact design Easy to install Ideal for DIY speaker upgrades and repairs 📋 Technical Specifications Product Type: Passive Radiator Bass Diaphragm Material: Rubber + ABS Plastic+Metal Shape: Oval / Square / Round (Depending on Selected Variant) Available Sizes: Multiple Sizes (2040 to 6090 Series) Operation: Passive (No Voice Coil or Magnet) Power Requirement: None Installation Type: Speaker Cabinet Mount Application: Low Frequency Bass Enhancement Color: Black 🔧 Applications Suitable for: Bluetooth Speakers Portable Speakers DIY Speaker Projects Multimedia Speakers Home Audio Systems Bookshelf Speakers Soundbars Subwoofers Wireless Speakers Audio System Repairs Custom Speaker Cabinets DIY Audio Enclosures 📦 Package Includes 1 × Passive Radiator Bass Diaphragm (Size & Shape as Selected) ⚠️ Note This is a passive radiator only and does not contain a voice coil, magnet, or electrical terminals. Product images are for reference only. The actual product may vary slightly in appearance depending on the selected size, shape, or manufacturing 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)
Passive Diaphragm Radiator Speaker Accessories Showcase Speaker Repair Parts
[Passive Radiator] Product Description: Model: 88 48 Low Frequency Vibration Plate Type: Sound film, diaphragm Material: Rubber Size: 88*48mm Net weight: 35 grams The bass radiator is also called a passive speaker. It is used to replace the inverted tube. The subwoofer made with the radiator has the following advantages compared with the traditional inverted subwoofer. The low frequency diving depth is equal to the back type, but the speed is the same. In this sense, it is faster than the inverted type, using the advantage of a certain closed box, and at the same time completely eliminating the disadvantage of the inverted structure-that is, the wind noise brought by the inverted nozzle. Package Includes: 1 x Passive Diaphragm Radiator Speaker Accessories Showcase Speaker Repair Parts
Rubber Passive Radiator Bass Vibration Plates
[Passive Radiator] The Oval Shape Passive Radiator Bass Diaphragm Rubber Speaker Plate is designed to enhance the low-frequency bass response of speaker systems without requiring additional power. Made from high-quality flexible rubber, this passive radiator works by using the air pressure generated inside the speaker enclosure to produce deep and powerful bass vibrations. Passive radiators act as an alternative to traditional bass reflex ports. Instead of allowing air to escape through a port, the radiator diaphragm vibrates in response to internal air pressure from the active driver, resulting in stronger bass performance, reduced distortion, and improved overall sound quality. These DIY speaker passive radiators are ideal for portable speakers, Bluetooth speakers, subwoofers, home audio systems, and custom speaker enclosures. Their lightweight yet durable construction ensures long-lasting operation and easy installation in a wide variety of audio projects. Available in sizes 4080, these passive radiators allow builders and audio enthusiasts to choose the right size for their speaker design and enclosure. Perfect for DIY speaker upgrades, custom audio builds, and professional speaker system enhancements, this rubber bass vibration plate delivers powerful bass performance without increasing power consumption. ⭐ Key Features Durable Rubber Construction for long-lasting use Enhances Bass Performance and low-frequency response Passive Operation – No Power Required Improves Sound Clarity and reduces distortion Lightweight and Compact Design Available in Sizes 4080 Ideal for DIY speaker projects and audio upgrades Easy to integrate into speaker enclosures 🔧 Technical Specifications Product Type: Passive Radiator / Bass Diaphragm Plate Shape: Oval Material: High-quality Rubber Function: Passive Bass Radiator Operation: Air-pressure driven vibration Available Sizes: 4080variants Installation Type: Speaker enclosure mounting Application: Audio speakers & subwoofer systems 🎯 Applications DIY speaker projects Portable Bluetooth speakers Home theater systems Subwoofer speaker boxes Custom speaker cabinets Audio system upgrades 📦 Package Includes 1 × Oval Shape Passive Radiator Bass Diaphragm Plate
20S 2Amps Active Balancer Equalizer for Lithium Battery Pack
[Lithium Battery Protection Board] The NEEY 20S 2A Active Balancer Equalizer is an intelligent battery balancing module designed for 20 series Lithium battery packs. It uses active energy transfer technology to redistribute energy from higher-voltage cells to lower-voltage cells, ensuring the entire battery pack remains balanced during operation. Unlike passive balancers that dissipate excess energy as heat, this active balancing system transfers energy between cells, improving battery efficiency, performance, and lifespan. With up to 2A balancing current, the module quickly corrects voltage differences between cells, preventing issues such as cell overcharge, deep discharge, and imbalance. This makes it ideal for solar energy storage systems, electric vehicles, DIY battery packs, power walls, and industrial energy storage solutions. The NEEY active balancer provides reliable and efficient balancing to maintain stable battery pack performance in demanding applications. 🔹 Key Features Supports upto 20S Lithium battery packs Active energy transfer balancing technology Maximum 2A balancing current Improves battery efficiency and lifespan Reduces cell voltage imbalance Low heat generation compared to passive balancing Stable operation across wide temperature range Easy installation with long balance wires 🔹 Technical Specifications Parameter Specification Brand / Model NEEY 20S2A Battery Type Lithium Battery Strings 20S Balancing Method Active Balancing Maximum Balance Current 2A Operating Voltage Range 2.8V – 3.65V per cell Adjacent Cell Difference ≥0.1V (0.5–0.7A balancing) Maximum Balance Current 2A when voltage difference ≥0.2V Working Temperature -20°C to 60°C 🔹 Product Dimensions Size: 95 × 92 × 8 mm Weight: 135 g Balance Wire Length: 60 cm 🔹 Applications Solar energy storage systems LiFePO4 battery packs Electric vehicles (EV) E-bikes and electric scooters Energy storage systems (ESS) DIY lithium battery packs Industrial power systems 🔹 Package Includes 1 × NEEY 20S 2A Active Balancer Unit 1 × Balance Wire Harness (60 cm)
4s 2a Lifepo4 li-ion Active Lithium Battery Equalizer Balance Board BMS
[Lithium Battery Protection Board] The 4S 2A Active Balancer Equalizer is designed to keep lithium battery cells balanced during both charging and discharging. It continuously monitors the voltage of each cell in the battery pack. When a voltage difference appears, the module transfers energy from higher-voltage cells to lower-voltage cells. As a result, all cells remain balanced and the battery pack works more efficiently. Unlike passive balancing systems, this module does not waste energy as heat. Instead, it redistributes energy between cells. Therefore, the battery pack becomes more efficient and lasts longer. In addition, the balancer automatically starts working when the voltage difference between adjacent cells reaches 0.1V. The balancing process continues until the difference drops to about 0.03V. Because of this smart balancing system, the battery pack stays stable and reliable. This module is suitable for 4S lithium battery packs, including both LiFePO4 and Li-ion batteries. It is commonly used in solar energy storage systems, electric vehicles, and DIY battery projects. 🔹 Key Features Supports 4S LiFePO4 and Li-ion battery packs Active energy transfer balancing Maximum balancing current up to 2A Improves battery efficiency and lifespan Reduces voltage differences between cells Low heat generation compared to passive balancers Automatic balancing during charging and discharging 🔹 Technical Specifications Parameter Specification Battery Type LiFePO4 / Li-ion Battery Series 4S Balance Method Active balancing Maximum Balance Current 2A Operating Voltage Range 2.0V – 4.5V Balance Start Voltage Difference ≥ 0.1V Maximum Balance Current Condition ≥ 0.2V difference Balance Stop Difference ~0.03V Operating Temperature -20°C to 60°C 🔹 Applications This active balancer is suitable for many battery systems, such as: Solar battery packs DIY lithium battery packs Electric scooters and bikes Energy storage systems Backup power systems 🔹 Package Includes 1 × 4S 2A Active Balancer Module
Daly Lifepo4 8S 24V 30A Battery Management System
[Lithium Battery Protection Board] Daly Lifepo4 8S 24V 30A Battery Management System Circuit is an 8Cell in Series 24V circuit power tool mostly used for solar lighting. It is designed for lithium Batteries for charging and protection from overcharge, and Over-discharge. The battery protection board, as the name suggests battery protection board is mainly rechargeable and protects the integrated circuit board. Lithium batteries (rechargeable type) need protection, which is determined by their own characteristics. As the Orange lithium battery, its material determines itself can not be overcharged, overcharged, overcurrent, short circuit, or ultra-high temperature charge and discharge, so lithium battery lithium components will always follow A protective plate with a sampling resistor, and a current fuse. Features: State of charge calculations. Cell over-voltage and under-voltage protection. Intelligent battery balancing (passive). Fully sealed waterproof technology, with waterproof, dustproof, shockproof, anti-squeezing, and other protective functions Cable Size (AWG): 12 Charge Current(A) :30A Length (mm): 80 Width (mm): 60 Height (mm): 10 Model: 8S 24V 30A Over Discharge Detect(V) : 2.2±0.1 Over Discharge Release(V): 2.7±0.1 Overcharge Detect Voltage(V): 3.75±0.05 overcharge Release Voltage(V): 3.55±0.05 Weight (g):: 86 Operating Temperature (°C) :-20 to 70 Shipping Weight0.165 kgShipping Dimensions16 × 11 × 6 cm Package Includes: 1 x Daly Lifepo4 8S 24V 30A Battery Management System
Out of stockAluminum Heat Sink for TO-220 Mosfet Transistor
[Aluminium Heat Sink] A heat sink is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device. It allows the regulation of the device's temperature at an optimal level. In computers, heat sinks are use to cool central processing units or graphics processors. If heat dissipation ability of the component itself is insufficient to maintain it's temperature; then Heat sinks are use with high-power semiconductor devices. An Aluminum heatsink is the most widely used product for thermal solutions. Features: Excellent corrosion resistance Low weight Non-magnetic Easy to recycle Great addition to your hobby craft tool kit. Perfect Product for your safety and Lab supply. Good for many applications include industrial, laboratory, personal, and hobbies. Package includes This is the pack of 1 piece of 2cm x 1.5cm Aluminium heatsink for TO-220 Mosfet transistor
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.
Out of stockHigh Current Active Alarm Buzzer Driver Module
[Current Sensor] A High Current Active Alarm Buzzer Driver Module is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric. Just like what you are viewing now, it is 5V DC Electronic Part Active Buzzer Module. Using top quality material, it is durable in use. What’s more? This active buzzer rings out as long as it is electrified. Compared with a passive buzzer, it is a bit expensive but easier to control. Typical uses of buzzers include alarm devices, timers, and confirmation of user input such as a mouse click or keystroke. A good choice for you all! Features: An active buzzer with a concussion internal source- so long as it will be called an energized. The program easy to control- SCM can let a high-low sound- while passive buzzer did not. Operating voltage 3.3V-5V PCB Dimension: 3.1cm*1.3cm. Color: Blue Easy to use Package Includes : 1 x High Current Active Alarm Buzzer Driver Module
PIR Motion Sensor Detector Module HC-SR501
[IR and PIR Sensors] If you want to build a device that is used to detect sense motion and almost always used to detect whether a human has moved in or out of the sensors range. Then this Sensor is needed for you. you can buy this sensor from https://roboman.in/ at a reasonable price The PIR Motion Sensor Detector Module HC SR501 allows you to sense motion. It is almost always used to detect the motion of a human body within the sensor’s range. It is often referred to using “PIR”, “Pyroelectric”, “Passive Infrared” and “IR Motion” sensors. The module has an onboard pyroelectric sensor, conditioning circuitry, and a dome-shaped Fresnel lens. It has a delay time adjustment Potentiometer and sensitivity adjustment Potentiometer. Compatible with ARDUINO, RASPBERRY PI, AVR, PIC, 8051, etc. Note: The Product is available in two colors Blue and Green, therefore packing you may get any one of them. Circuit Diagram of PIR Sensor With Arduino: Features : Infrared Sensor with Control Circuit Board The Sensitivity and Holding Time are adjustable. Blockade time: 2.5s (Default) Sensitive Setting: Turn to Right, Distance Increases (About 7M); Turn to Left, Distance Reduce (About 3M) Time Setting: Turn to Right, Time Increases (About 200S); Turn to Left, Time Reduce (About 5S). Package Includes : 1 x PIR Motion Sensor Detector Module HC SR501