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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
Only 1 leftIOT Smarthome Kit
MCU: ESP8266/ESP32. Modules: 1–4 channel relay (optocoupled preferred), PIR, LDR, DHT. Control: app/web dashboard. Protocols: MQTT/HTTP. Power: 5V input. Properly isolated AC relay use.
HLK-5M05 Hi-Link 5V 5W AC to DC Power Supply Module Isolated SMPS PCB Mount
[AC DC Power Supply Module] The HLK-5M05 Hi-Link 5V 5W AC to DC Power Supply Module is a compact isolated switching power supply designed for converting high-voltage AC input into a stable 5V DC output. It is widely used in embedded systems, automation projects, smart home devices, and industrial electronics. Unlike traditional transformer-based power supplies, this module integrates advanced switching power technology into a compact PCB-mount design. As a result, it offers high efficiency, low heat generation, and reliable long-term performance. In addition, the module supports a wide input voltage range from 90V AC to 264V AC, making it suitable for global power standards. Furthermore, the isolated design improves safety and helps protect connected electronic circuits. The HLK-5M05 includes built-in short-circuit, overload, and overcurrent protection, ensuring safe and stable operation. Moreover, its low ripple and low noise output make it suitable for sensitive electronic devices and microcontroller circuits. Because of its ultra-compact size and PCB mounting capability, the module is easy to integrate into custom electronic products and DIY projects. Therefore, it is commonly used in IoT systems, smart switches, automation controllers, industrial instruments, and communication equipment. 🔹 Key Features Stable 5V DC output 5W isolated switching power supply Wide AC input voltage support Compact PCB mount design Low ripple and low noise output Built-in overload and short-circuit protection High efficiency and reliability UL and CE compliant design Low no-load power consumption Suitable for industrial and DIY applications 🔹 Technical Specifications Model: HLK-5M05 Product Type: AC to DC Switching Power Supply Module Input Voltage: 90V – 264V AC Rated Input Voltage: 100V – 240V AC Output Voltage: 5V DC Output Power: 5W Maximum Output Current: 1000mA Short-Term Peak Current: ≥1200mA Input Frequency: 50/60Hz Maximum Input Current: ≤0.2A Efficiency at 220V AC: ≥70% Efficiency at 110V AC: ≥69% Ripple & Noise: ≤70mVp-p Voltage Regulation: ±0.2% Load Regulation: ±0.5% Isolation Type: High Isolation Cooling Method: Natural Air Cooling Working Temperature: -20°C to +60°C Storage Temperature: -40°C to +80°C Relative Humidity: 5% – 95% RH Mounting Type: PCB Mount Safety Protection: Overload & Short-Circuit Protection 🔹 Applications This AC to DC module is suitable for many electronic and industrial applications, including: Smart home systems IoT devices Automation controllers Industrial control systems Communication equipment DIY electronics projects Embedded systems Power supply circuits 🔹 Package Includes 1 × HLK-5M05 Hi-Link 5V 5W AC to DC Power Supply Module
Out of stock0.28 inch DC 100V 100A LED Digital Ammeter-Voltmeter With Shunt
[Ammeter and Voltmeter] This is 0.28 inch DC 100V 100A LED Digital Ammeter–Voltmeter With Shunt. This meter will measure up to 100 VDC with a 0.1-volt resolution. One thing to note is, this meter has 2 wiring harnesses. One harness is to provide power for the meters, that’s the 2 poles with a RED and a BLACK lead. Small size, portable, the magnitudes of voltage, and current are displayed on the same screen at the same time. This can be supplied anywhere from 6 volts DC up to 30 VDC. This is a separate power supply that is isolated from the source, it is possible to use the same supply but it seems to affect the amp meter reading. The 3 wire harness is used for a ground that connects directly to the battery or supply ground of the load. Note: There are different wiring variants with the same working functionality is available which will be shipped randomly. If the input voltage is more than 5V then please use the buck converter. Features : It measures up to 100V and 100A DC. Very handy and small in size. It requires a power supply of 5V. 100% Brand new and high quality. Package Includes: 1 x Dual LED Panel Ampere Voltage Meter. 1 x Current Shunt.
Out of stockHi Link HLK 5M05 5V/5W Switch Power Supply Module
[Power Supply] HLK-5M05 5V/5W Switch Power Supply Module is plastic enclosed PCB mounted isolated switching step-down power supply module. It can supply 5V DC from 120V AC – 230V AC and has a power rating of 5 Watt. This makes it perfect for small projects that need a 5 volt supply from mains. This power supply module replaces lots of parts from the traditional power supply like diodes, voltage regulator and transformers. Therefore there are many advantages for these modules, such as low-temperature rise, low power, high efficiency, high reliability, high-security isolation etc. This Power Supply Module voltage source is a switching source, so you do not have to worry about fluctuations in voltage grid. It is designed to be mounted on the PCB and is the ideal solution to power pads that you take. It is widely used in a smart home, automation and control, communication equipment, instrumentation and other industries. Features: Meet UL, CE requirements, Ultra-thin, ultra-small All voltage input (AC: 90 ~ 264V) Low ripple and low noise Output overload and short circuit protection High efficiency, high power density The product is designed to meet the requirements of EMC and Safety Test Low power consumption, environmental protection, no-load loss <0.1W Environmental conditions: Technical indicators: Single bit Working temperature: – 20-60 +degree Storage temperature: + 80-40 -degree Relative humidity: 5-95% The cooling way: Natural cooling The atmospheric pressure: 80-106Kpa The altitude: 2000M or less. Package Includes: 1 x HLK-5M05 5V/5W Switch Power Supply Module
250W High Power Constant voltage Current Adjustable Aluminum Substrate LED Driver Module
[Step UP Buck Converter] The 250W High Power DC-DC Boost Converter with Constant Voltage & Constant Current Control is a versatile and efficient power module designed for demanding applications such as LED driving, battery charging, and power supply systems. Built on an aluminum substrate for superior heat dissipation, this module ensures stable performance even under high load conditions. It supports adjustable output voltage (10V–50V) and current control up to 6A (10A peak), making it ideal for precision applications. With high efficiency up to 96%, premium components, and dual potentiometer control, this module delivers reliable and customizable power output for both hobbyists and professionals. Key Features ⚡ High Power Output (Up to 250W)Supports high-power applications with stable voltage and current control. 🔧 Adjustable Voltage & CurrentFine-tune output using onboard multi-turn potentiometers for accurate control. 🔥 Aluminum Substrate Heat DissipationIntegrated heat sink design ensures continuous operation under heavy load. 📈 High Efficiency (92%–96%)Minimizes power loss and improves system performance. 🧠 Stable Constant Current OutputLow temperature drift (<1%) ensures reliable performance for LED applications. 🔌 Wide Application SupportSuitable for LED drivers, battery charging, solar systems, and DIY power supplies. Specifications Specification Description Module Type Non-Isolated Boost Converter Output Voltage 10V – 50V (Adjustable) Output Current Up to 6A (10A peak) Constant Current Range 0.2A – 6A Output Power Up to 250W Efficiency 92% – 96% Input Voltage 10V – 40V Static Current 10mA Mounting 4 × 3mm Screw Holes Cooling Aluminum Substrate Applications 💡 High Power LED Driver🔋 Battery Charging (Li-ion, Lead Acid, etc.)☀️ Solar Power Regulation🚗 Vehicle Power Supply Systems🔧 DIY Adjustable Power Supply💻 Laptop & Portable Device Power Usage Instructions Connect VIN+ / VIN- to input power supply Connect OUT+ / OUT- to load Adjust RV1 (Voltage) as per requirement Adjust RV2 (Current) based on load ⚠️ Always set voltage/current before connecting load Precautions Do not reverse input/output polarity Ensure proper heat dissipation at high load Input voltage must be at least 2V lower than output Avoid exceeding maximum current/power limits Do not adjust current using short circuit method Package Includes 1 × 250W High Power DC-DC Boost Converter Constant Voltage & Current Module
USB QC3.0 QC2.0 DC to DC Buck Converter Charging Module Fast Quick Charger
[Step Down Buck Converter] This module accepts a 6-24V Input and supports USB QC3 Charging on the output. It takes care of regulating the signals on the USB Data transer lines and offers fast charging when a compatible device is connected. Great for adding USB charging in your next project. Supports: QC2.0, QC3.0, MTK PE1.1/2.0, FOR Apple, FOR Samsung AFC,FOR Huawei FCP, FOR Spreadtrum SFCP Input voltage: DC 6~30V Output voltage: default 5V, adjust range 3~12V according to fast charging protocol Output capacity: single-port rated current 2.4A, Rated power 24W Protection measures: Output overvoltage protection, limit the output voltage does not exceed 13V (in the case of chip failure); input with a fuse. This mini DC-DC step-down voltage converter module supports 6-24V voltage input and 5V 3A output with input polarity reverse protection and output overvoltage protection, short circuit protection. It adopts synchronous rectification technology to ensure ultra-high power conversion up to 97.5% to take full use of your input power. On-board female type A USB port with identification circuit perfectly fit for smartphones as well as it can be useful to power or recharge any electronic gadget which required 5V input power up to 3A Features: Non-isolated buck module (BUCK) synchronous rectification Maximum Output Current: 3A MAX Conversion efficiency: can up to 97.5% (6.5V step down to 5V 0.7A) (after short reverse protection and fuses test value) Switch frequency: 500KHz Output Ripple: 10mV around (12V to 5V3A) 20M bandwidth Output indicator: The output voltage indicator is red Operating temperature: Industrial grade (-40 to + 85 ) (the higher the ambient temperature, the lower the output power) Output overvoltage protection: Yes, input 1.5A fuse, output 5V have 300W TVS tube clamp protection. Flat copper inductor, improve conversion efficiency With output overvoltage protection. There is a 1.5A fuse, output 5V have 300W TVS tube protect your USB device High-quality USB port Output voltage indicator (RED) Small size, Compact Size Input with reverse polarity protection diode, will not damage when input connect incorrectly Ultra-low static current, 0.85 mA only. Do not need to add switch when connected to the car battery, can be connected to car cigarette lighter cable or ACC power supply cable Ultra-small size, 26.4 (L) * 15 (W) * 7.4 (H) mm Input voltage range: 6V-32V Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge Output power: up to 24W (5V/3.4A, 9V/2.5A, 12V/2A, etc.) Output voltage cable compensation function Conversion efficiency: 90%-97% Support multiple fast charging protocols Input overvoltage and undervoltage protection Input overcurrent protection Output overcurrent, short circuit protection Machine over temperature protection Support fast charge agreement Support DCP protocol, BC1.2, Apple, Samsung protocol Support Huawei Fast Charge Protocol FCP/SCP Support Huawei Fast Charge Protocol AFC Support Spreadtrum Fast Charge Protocol SFCP · Support Qualcomm QC2.0 and 3.0 Support MTK PE1.1/PE2.0 Precautions: please enhance heat dissipation when fully used for load output(i.e. 5V@3A with 24V Input). For the ideal case (i.e. 5V@2A output with 12V Input) it does not need to enhance heat dissipation. Applications: Solar panel to mobile phone charging Car charging retrofit Driving recorder power supply Home power supply, smart plug modification Fast charge adapter Package Includes: 1 x USB Step Down DC-DC Converter Module
Out of stock12V 6 Channel with Light Coupling Relay Module
[Relay Module] This 6 Road/Channel Relay Module (with light coupling) 12V module meets the safety standard as control areas and load area have the isolation groove. Optical coupling isolation module. The triggering of the 6 Road/Channel Relay Module is reliable, more stable. The double FR–4 circuit board design, high-end SMT process. It has power and relay operation instructions. Relays terminals (C, NC, NO) are accessible through screw terminals which makes wiring up the board very easy. The inputs of the 8 Channel 12V Relay Module are isolated to protect any delicate control circuitry. A wide range of microcontrollers such as Arduino, AVR, PIC, ARM and so on can control it. The use of such high-voltage relay eliminates the risk of heating up of the relay as electromechanical relay limit the current consumption in accordance with a voltage rating. Module interface: The positive (according to the relay voltage VCC: connect power supply) GND: connect power negative IN1: relay module (effective) high-level trigger signal trigger end IN2: relay module (effective) high-level trigger signal trigger end IN3: relay module (effective) high-level trigger signal trigger end IN4: relay module (effective) high-level trigger signal trigger end IN5: relay module (effective) high-level trigger signal trigger end IN6: relay module (effective) high-level trigger signal trigger end IN7: relay module (effective) high-level trigger signal trigger end IN8: relay module (effective) high-level trigger signal trigger end Meaning of High level and Low-level High-level trigger refers to using the anode voltage at the VCC connection way of a trigger and triggers the end when the trigger side has a positive voltage or to trigger voltage when the relay is off. Low-level trigger refers to using the negative voltage at the GND connection way of a trigger and triggers the end when the trigger side has 0 v low voltage or voltage to can trigger, the relay is off. Features : Equipped with high-current relay 10A@250VAC / 10A@30VDC It can control both AC and DC appliances such as Solenoids, Motors, lights, fans, etc High-quality screw terminals (Terminal Block) provided (C, NC, NO) for quick and easy connection A freewheeling diode to protect your microcontroller Input Signal Pin connected to Burg stick for easy accessibility LED status indicators to indicate the relay ON/OFF status Mounting holes provided Signal input with a high-level signal, the common and often start conduction; The relay can directly control all kinds of equipment and load; One often opened a normally closed contact; Blue KF301 terminal line more convenient. It is also able to control various appliances and other types of equipment with a large current. Red working status indicator lights are conducive to safe use. Widely used for all MCU control, industrial sector, PLC control, smart home control. Package Includes: 1 x 12V 6 Channel with Light Coupling Relay Module
4 Channel Isolated 5V 10A Relay Module opto coupler For Arduino PIC AVR DSP ARM
[Relay Module] The 4 Channel Isolated 5V Relay Module is a reliable switching interface that enables low-voltage microcontrollers to safely control high-voltage and high-current electrical devices. Featuring four independent relays with opto-isolation, the module provides excellent electrical separation between the control circuitry and load side for enhanced safety and reliability. In addition, each relay can be individually controlled through dedicated input pins, allowing multiple devices to be switched independently. As a result, the module is ideal for home automation, industrial control systems, robotics, IoT projects, and appliance control applications. Because of its opto-coupler isolation design, the relay board helps protect sensitive microcontrollers from electrical noise and voltage spikes. Furthermore, onboard status LEDs provide clear indication of relay activation and power status. The module supports both AC and DC load switching, making it suitable for controlling lamps, fans, pumps, motors, solenoids, and various household appliances. Moreover, the high-quality relay contacts ensure reliable long-term operation under demanding conditions. This relay module is widely used in Arduino projects, Raspberry Pi automation systems, PLC control panels, industrial automation, smart home systems, and embedded electronics applications. 🔹 Key Features 4 independent relay channels Opto-isolated input design Supports high and low level triggering Compatible with Arduino, Raspberry Pi, ESP32, PIC, AVR, ARM, and PLC High-current relay contacts LED power and relay status indicators Electrical isolation between control and load circuits Suitable for AC and DC load switching Easy interfacing with microcontrollers Industrial-grade design 🔹 Technical Specifications Product Type: 4 Channel Relay Module Operating Voltage: 5V DC Number of Channels: 4 Relay Type: JQC3F-5VDC-C / SRD-05VDC-SL-C / FL-3FF-S-Z (Random) Contact Configuration: SPDT (NO, COM, NC) Maximum AC Load: 250V AC, 10A Maximum DC Load: 30V DC, 10A Trigger Voltage: Approx. 1V – 5V Isolation Method: Opto-Coupler Isolation Input Interface: Standard TTL Control Signal Trigger Mode: High-Level / Low-Level Trigger Status Indicators: Power LED and Relay LEDs Mounting Holes: Yes 🔹 Pin Configuration Control Side VCC – 5V Power Supply GND – Ground IN1 – Relay Channel 1 Control IN2 – Relay Channel 2 Control IN3 – Relay Channel 3 Control IN4 – Relay Channel 4 Control Relay Output Terminals For each channel: COM – Common Terminal NO – Normally Open Contact NC – Normally Closed Contact 🔹 Applications This relay module is suitable for: Arduino projects Raspberry Pi projects ESP32 projects Home automation systems Industrial automation PLC control systems Smart home devices Lighting control Motor and pump control Appliance switching IoT projects 🔹 Package Includes 1 × 4 Channel 5V 10A Opto-Isolated Relay Module
Out of stock5V 6 Channel Low Level Relay Module with Light Coupling
[Relay Module] It is a 5V 6 Channel Low-Level Relay Module with Light Coupling. The relay normally open interface maximum load: AC 250V/10A, DC 30V/10A. With optocoupler isolation, strong drive capability, stable performance; trigger current 5mA, module working voltage: DC 5V. Each channel of the module can be triggered by a jumper to set a high level or a low level. Fault-tolerant design, even if the control line is disconnected, the relay will not move. With status indicator: power (green), 6-channel relay status indicator (red). All module size interfaces can be directly connected through the terminal block, which is convenient and practical. Features: 6-way relay output module contact capacity is 10A 250V. input IN1, IN2, IN3, IN4, IN5, IN6 signal, a low level is effective. Using single-chip design, reliable performance, strong anti-interference, no false triggering, superior performance. The trigger terminal has optocoupler isolation, the independent external power supply can trigger completely isolated. Each relay has an activity indicator light. With 4 fixed bolt holes, easy installation. Support all SCM control. It is applicable to the industrial sector, PLC control and home intelligent control. Package Includes: 1 x 5V 6 Channel Low-Level Relay Module with Light Coupling.
LM2596 DC-DC Buck Converter 4.5-40V to 3-35V Adjustable Step Down Module
[Step Down Buck Converter] Introducing a high-performance DC to DC Step Down Adjustable Power Supply Module, built upon the newly developed LM2596S Wide Range Switching Regulator. With dimensions approximately 43 x 20 x 14 mm and a color as shown in the picture, this module offers reliable and efficient power regulation. Key Specifications: – Full Load Temperature Rise: 40°C – Load Regulation: ± 0.5% – Voltage Regulation: ± 0.5% – Dynamic Response Speed: 5% in 200uS – Input Voltage: 4.50-40V – Output Voltage: Adjustable in the range of 1.50-35V – Output Current: Rated at 2A, with a maximum of 3A (Additional heat sink required for maximum output) – Conversion Efficiency: Up to 92% (Efficiency increases with higher output voltage) – Switching Frequency: 150KHz – Rectifier: Non-Synchronous Rectification – Module Properties: Non-isolated step-down module (buck) – Short Circuit Protection: Current limiting, with automatic recovery – Operating Temperature: Industrial grade (-40 to +85°C) for output power of 10W or less Features: Adjustment method: first correct input power (between 4.5-50V) then multimeter to monitor the output voltage and adjust potentiometer (usually clockwise turn boost, buck turn counterclockwise), Input: IN+ input positive IN- input negative Output: OUT+ output positive OUT- output negative Static power consumption is only about 6mA. Connection: Welding, plus pin can be directly soldered after the PCB. Short circuit protection: current limiting, thermal protection, self-recovery. Non-isolated step-down (BUCK) switching regulator. Short circuit protection: Current limiting, self-recovery Potentiometer adjustment direction is as Clockwise (increase) and Anti-clockwise (decrease) Non-synchronous rectification Package Includes : 1 x LM2596 DC-DC Buck Converter 4.5-40V to 3-35V
Out of stockXL6009 DC-DC Step-Up Converter Performance Ultra LM2577 Booster Circuit Board
[Step UP Buck Converter] This CN6009 XL6009 DC – DC Step-up converter module is a non-isolated step-up (boost) voltage converter featuring adjustable output voltage and high efficiency. The module uses the second generation of high-frequency switching technology XL6009E1 core chip performance than the first generation technology LM2577. XL6009 boost module at a lower cost, superior performance. It equips 4A high-efficiency MOSFET switches, so as to provide a conversion efficiency of up to 94%. High switching frequency 400KHz, you can use a small -capacity filter capacitors that can achieve very good results, the ripple is smaller and smaller Pins IN+ input positive IN- input negative! OUT+ output positive OUT- output negative Features : The performance is much higher than LM2577. Non-isolated Boost converter. It has a non-synchronous rectifier. Small and Handy voltage regulator module. Package Includes : 1 x CN6009 XL6009 DC-DC Step-up converter module.