The AD584 4-ch Voltage Reference Module is designed to provide stable and accurate reference voltages of 2.5 V, 5 V, 7.5 V, and 10 V. It incorporates the AD584 integrated circuit, known for its high accuracy and stability. Features Multiple Output Voltages: The module can output four different reference voltages (2.5 V, 5 V, 7.5 V, and 10 V) accessible through a single port. Microcontroller-based Switching: An onboard microcontroller facilitates switching between the four voltage outputs, with LED indicators displaying the active selection. User-Friendly Operation: A single button allows for easy cycling through the available reference voltages. Transparent Housing: The module is encased in a transparent housing, offering protection while allowing users to view the internal components. Power Supply Options: It can be powered via a built-in lithium battery (not included) or through a 5 V DC input. A charging indicator provides status updates during charging. Output Interface: Equipped with 4mm banana sockets for secure and reliable connections. Included 1x AD584 4-ch Voltage Reference Module with Housing Downloads Datasheet

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This programmer is specifically designed for burning bootloaders (without a computer) on Arduino-compatible ATmega328 development boards. Simply plug the programmer into the ICSP interface to re-burn the bootloader. It’s also compatible with new chips, provided the IC is functional. Note: Burning a bootloader erases all previous chip data. Features Working voltage: 3.1-5.3 V Working current: 10 mA Compatible with Arduino Nano based boards (ATmega328) Dimensions: 39.6 x 15.5 x 7.8 mm

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This programmer is specifically designed for burning bootloaders (without a computer) on Arduino-compatible ATmega328P/ATmega328PB development boards. Simply plug the programmer into the ICSP interface to re-burn the bootloader. It’s also compatible with new chips, provided the IC is functional. Note: Burning a bootloader erases all previous chip data. Features Working voltage: 3.1-5.3 V Working current: 10 mA Compatible with Arduino Uno R3 based boards (ATmega328P or ATmega328PB) Dimensions: 39.6 x 15.5 x 7.8 mm

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The DIY Mini Digital Oscilloscope Kit (with shell) is an easy-to-build kit for a tiny digital oscilloscope. Besides the power switch, it has only one other control, a rotary encoder with a built-in pushbutton. The kit's microcontroller comes preprogrammed. The 0.96" OLED display has a resolution of 128 x 64 pixels. The oscilloscope features one channel that can measure signals up to 100 kHz. The maximum input voltage is 30 V, the minimum voltage is 0 V. The kit consists of through-hole components (THT) are surface-mount devices (SMD). Therefore, assembling the kit means soldering SMD parts, which requires some soldering experience. Specifications Vertical range: 0 to 30 V Horizontal range: 100 µs to 500 ms Trigger type: auto, normal and single Trigger edge: rising and falling Trigger level: 0 to 30 V Run/Stop mode Automatic frequency measurement Power: 5 V micro-USB 10 Hz, 5 V sinewave output 9 kHz, 0 to 4.8 V square wave output Display: 0.96-inch OLED screen Dimensions: 57 x 38 x 26 mm Downloads Documentation

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This development board (also known as "Cheap Yellow Display") is powered by the ESP-WROOM-32, a dual-core MCU with integrated Wi-Fi and Bluetooth capabilities. It operates at a main frequency of up to 240 MHz, with 520 KB SRAM, 448 KBROM, and a 4 MB Flash memory. The board features a 2.8-inch display with a resolution of 240x320 and resistive touch. Furthermore, the board includes a backlight control circuit, touch control circuit, speaker drive circuit, photosensitive circuit, and RGB-LED control circuit. It also provides a TF card slot, serial interface, DHT11 temperature and humidity sensor interface, and additional IO ports. The module supports development in Arduino IDE, ESP-IDE, MicroPython, and Mixly. Applications Image transmission for Smart Home device Wireless monitoring Smart agriculture QR wireless recognition Wireless positioning system signal And other IoT applications Specifications Microcontroller ESP-WROOM-32 (Dual-core MCU with integrated Wi-Fi and Bluetooth) Frequency Up to 240 MHz (computing power is up to 600 DMIPS) SRAM 520 KB ROM 448 KB Flash 4 MB Operating voltage 5 V Power consumption approx. 115 mA Display 2.8-inch color TFT screen (240x320) Touch Resistive Touch Driver chip ILI9341 Dimensions 50 x 86 mm Weight 50 g Included 1x ESP32 Dev Board with 2.8" Display and acrylic Shell 1x Touch pen 1x Connector cable 1x USB cable Downloads GitHub

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This DIY kit (HU-017A) is a wireless FM radio receiver with a 4-digit 7-segment display. It operates within the global FM receiving frequency band of 87.0-108.0 MHz, making it suitable for use in any country or region. The kit offers two power supply modes, allowing you to use it both at home and outdoors. This DIY electronic product will help you understand circuits and improve your soldering skills. Features 87.0-108.0 MHz FM Radio: Built-in RDA5807 FM data processor with a standard FM receiving frequency band. The FM frequency can be adjusted using the F+ and F- buttons. Adjustable Volume: Two volume adjustment methods – button and potentiometer. There are 15 volume levels. Active & Passive Audio Output: The kit has a built-in 0.5 W power amplifier to drive 8 Ω speakers directly. It also outputs audio signals to headsets or loudspeakers with AUX interfaces, allowing personal listening and sharing of FM audio. Configured with a 25 cm dedicated FM antenna and a (red) 4-digit 7-segment display for real-time display of FM radio frequency. The transparent acrylic shell protects the internal circuit board. It supports dual power supply methods – 5 V USB and 2x 1.5 V (AA) batteries. DIY Hand Soldering: The kit comes with various components that need to be installed manually. It helps exercise and improve soldering skills, making it suitable for electronics hobbyists, beginners, and educational purposes. Specifications Operating voltage DC 3 V/5 V Output impedance 8 Ω Output power 0.5 W Output channel Mono Receiver frequency 87.0 MHz~108.0 MHz Frequency accuracy 0.1 MHz Operating temperature −40°C to +85°C Operating humidity 5% to 95% RH Dimensions 107 x 70 x 23 mm IMPORTANT: Remove the batteries when powering the radio over to USB. Included 1x PCB 1x RDA5807M FM Receiver 1x STC15W404AS MCU 1x IC Socket 1x 74HC595D Register 1x TDA2822M Amplifier 1x IC Socket 1x AMS1117-3.3 V Voltage Converter 18x Metal Film Resistor 1x Potentiometer 4x Ceramic Capacitor 5x Electrolytic Capacitor 4x S8550 Transistor 1x Red LED 1x 4-digit 7-segment Display 1x Toggle Switch 1x SMD Micro USB Socket 1x Radio Antenna 1x AUX Audio Socket 4x Black Button 4x Button Cap 1x 0.5 W/8 Ω Speaker 1x Red/Black Wire 2x Double-sided adhesive 1x AA Battery Box 1x USB cable 6x Acrylic Board 4x Nylon Column Screw 4x M3 Screw 4x M3 Nut 4x M2x22 mm Screw 1x M2x6 mm Screw 5x M2 Nut

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This rugged, passive aluminum cooling case is made specifically for the Raspberry Pi 5 and offers a sleek design that ensures both durability and effective heat dissipation. The case is exclusively compatible with the Raspberry Pi 5 and provides a passive cooling solution, eliminating the need for a fan while still managing heat efficiently. Features High quality aluminum construction: Made from high quality aluminum, this case is built to last and withstand regular use. Optimized heat dissipation: The passive cooling design uses the aluminum structure to keep your Raspberry Pi 5 cool without the need for a fan. Full port accessibility: Every port on the Raspberry Pi 5 is easily accessible, from the microSD card slot to USB, micro HDMI and GPIO ports. GPIO cable support: A reserved interface for the GPIO cable ensures that you can continue to use this important function without having to remove the case. Convenient power switch: The case has an integrated power switch that allows you to turn your device on and off.

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The ICL8038 signal generator delivers versatile waveforms, including sine, triangle, square, and forward/reverse sawtooth, making it suitable for a wide range of applications. Powered by the ICL8038 chip and high-speed operational amplifiers, it ensures exceptional precision and signal stability. With a frequency range of 5 Hz to 400 kHz, it supports applications from audio to radio frequencies. Its adjustable duty cycle, ranging from 2% to 95%, allows for precise waveform customization to meet various needs. The DIY kit is beginner-friendly, featuring through-hole components for easy assembly. It includes all necessary parts, an acrylic shell, and a detailed manual, providing everything required to build and use the signal generator efficiently. Specifications Frequency range 5 Hz~400 KHz (adjustable) Power supply voltage 12 V~15 V Duty cycle range 2~95% (adjustable) Low distortion sine wave 1% Low temperature drift 50 ppm/°C Output triangular wave linearity 0.1% DC bias range −7.5 V~7.5 V Output amplitude range 0.1 V~11 VPP (working voltage 12 V) Dimensions 89 x 60 x 35 mm Weight 81 g Included PCB incl. all necessary components Acrylic shell Manual

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The Mixer Geek Theremin+ is a fun and innovative electronic musical instrument inspired by the classic Theremin. Unlike traditional instruments, the Theremin+ is played without physical contact, using hand movements in the air to control pitch and volume. The Theremin+ offers an exciting and hands-on way to explore music and sound experimentation. Features Ready to use out of the box Equipped with a loudspeaker and full-color screen Intuitive button-based navigation and confirmation Choose from over 70 tones Multiple customizable function settings Displays waveform, time, frequency, volume, and corresponding piano pitch (display can be turned off) Powered via USB-C port; compatible with power banks Compact design with removable telescopic antenna for easy storage Connects to headphones, external speakers, or recording devices Dimensions: 98 x 70 x 18 mm Included 1x Theremin+ Musical Instrument 2x Antennas 1x USB-C cable

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Create lightning with the touch of your fingers or the clap of your hands The Plasma Magic Ball is a cutting-edge tech gadget and an eye-catching piece of art. Inside the glass sphere, a special gas mixture creates mesmerizing light effects when activated by high-frequency current – like holding a storm in your hands. Perfect for use at home, in the office, schools, hotels, or bars, it’s a unique decorative element that sparks curiosity. Looking for a fun and unusual gift? The Plasma Magic Ball is a great choice for friends and family alike. Despite its stunning effects, the Plasma Magic Ball uses very little electricity. The glass itself is made of specially hardened, high-strength material and can withstand temperatures of up to 522°C (972°F). Specifications Material Plastic Ball diameter 6 inch (15 cm) Input voltage 220 V Output voltage 12 V Power 15 W Dimensions 25 x 15.5 x 15.5 cm

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The Smart USB Soldering Iron Kit is a compact, cordless solution designed for precision and portability. Featuring intelligent three-speed temperature control (300-450°C) with an easy-to-read LED display, it heats up in just 10 seconds and melts solder in as little as 6 seconds. The 1000 mAh rechargeable battery delivers up to 30 minutes of continuous use, making it ideal for quick repairs, electronics projects, and DIY tasks. With a plug-and-play, replaceable tip and a high-temperature-resistant insulated shell, it’s safe, user-friendly, and perfect for both beginners and professionals on the go. Features Three-Speed Intelligent Temperature Adjustment: Features an LED display screen with adjustable temperatures between 300-450°C (572-842°F). Easily switch between Celsius and Fahrenheit. Integrated Plug-In Soldering Iron Tip: Plug-and-play design. The tip can be replaced by simply unscrewing it, ensuring quick and convenient operation. Safe and Durable Design: High-temperature-resistant, insulated shell for enhanced safety during use. Battery Capacity: Equipped with a rechargeable 1000 mAh battery that supports up to 30 minutes of continuous operation on a full charge – ideal for everyday tasks. Efficient Performance: 8 W power with an integrated heating core for rapid heat-up. Melts tin in just 6 seconds, providing excellent thermal conductivity. Easy to Use: After powering on via USB, set your desired temperature. The soldering iron heats up in 10 seconds. Once finished, place the tip on the stand—it cools down within 1 minute. Perfect for beginners, hobbyists, basic home repairs, and training engineers. Cordless Innovation: This cordless soldering kit includes a built-in rechargeable lithium-ion battery, eliminating the need for cables. Versatile use for circuit board soldering, electrical repairs, jewelry making, metal crafts, computer maintenance, and DIY projects. Specifications Adjustable Temperature: 300-450°C (572-842°F) Tin Melting Time: <15 seconds Working Voltage: 5 V Power Output: 8 W Battery Capacity: 1000 mAh Auto Sleep Function: Activates after 10 minutes of inactivity Charging Time: Approx. 90 minutes Battery Life: Up to 30 minutes continuous use Charging Interface: USB-C Main Material: Aluminum alloy Dimensions: 190 x 16 mm (7.4 x 0.6") Included 1x USB Soldering Iron 1x Soldering Tip 1x Soldering Rosin 1x Soldering Iron Holder (with Sponge) 1x USB-C Charging Cable 1x Solder Wire 1x Storage Box

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This ultrasonic distance sensor (ME007-ULA V1) offers high performance with a robust, waterproof probe. Operating on the principle of ultrasonic echo ranging, the sensor determines the distance to a target by measuring the time elapsed between sending a pulse and receiving the echo. Its non-contact design allows it to detect a wide range of materials, including transparent or non-ferrous objects, metals, non-metals, liquids, solids, and powders. Specifications Detecting Distance 27~800 cm Output Interface RS232, Voltage Analog Operating Voltage 5-12 V Average Current <10 mA Operating Temperature −15~60°C Dimensions 60 x 43 x 31 mm

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