A new version of the popular mono amplifier kit, capable of amplifying audio from any source, such as MP3 players, using the NCP2890 with an output power of up to 1 W. The kit comes pre-assembled, including a jack cable, 8Ω speaker, and a battery holder for two AA batteries, allowing for quick start-up and ideal for portable DIY audio projects. Kitronik 2165B

Module with the driver of motors TB6612FNG and driver PWM PCA9685 for Raspberry Pi Pico. It allows you to control the movement of 4 DC motors. Waveshare Pico-Motor-Driver

Converter that provides easy communication between the RS232 and RJ45 Ethernet interface. Configurable via web page or AT commands. USR-DR301

The TPA3116D2 amplifier module is a digital class D amplifier, offering 2x50W of power for stereo channels and 100W for the subwoofer, powered by 12V-24V. Thanks to the built-in NE5532 low-pass filter, it provides clean bass sound, and three potentiometers allow you to adjust the volume and cutoff frequency.

Module with 24V relay and timer. It allows the implementation of delayed switching on or off of the circuit with adjustable time in the range from 1 s to 100 s and from 1 s to 15 min.

Step-Up DC-DC converter module. It has an input voltage of 1.3 to 16 V, an output voltage of 6 V and a maximum input of up to 2 A. Pololu 4942

Pololu 2833

Compact module that allows easy changing of I2C sensor addresses, allowing coexistence of multiple devices with the same address on one bus. With DIP switches and optional soldering resistors, users can easily configure sensor addresses without having to modify the code or use external components. DFRobot DFR1185

16-channel GPIO expander with an I2C interface microcontroller can interface with 16 fully configurable digital input/output pins. It can produce PWM signals, so you can dim LEDs. It can be set to blink or even breathe pins at varying rates. With a built-in keypad engine, it can interface with up to 64 buttons set up in an 8x8 matrix. BOB-13601

Crowtail-TPL5111 Reset Enable Timer is a module for energy-efficient power control of devices in battery-powered projects. It offers six programmable time intervals and an automatic reset mode, supporting the design of low-power circuits.

Compact controller with XIAO ESP32-C3 module, enabling precise control of ST/SC servos via UART interface. Thanks to its solid construction and 5-12 V power supply, it allows simultaneous control of multiple servos, which is suitable for humanoid robots, hexapods and robotic arms. Arduino IDE support, open architecture and easy assembly make it a great tool for education, prototyping and advanced robotic projects. Seeed Studio 114993612

Module with EEPROM memory, capacity 512 kbit (64kB). Communication takes place via the I2C interface. The module has 3 jumpers that enable selection of one of 8 addresses. SparkFun SPX-14764

A step-down converter module that allows you to reduce the input voltage from 12.2–36 V to a stable 12 V, ensuring high efficiency thanks to SMPS technology. A maximum output current of 600 mA allows you to power microcontrollers, IoT modules, and other electronic systems. The device is equipped with short circuit and overheating protection and offers very low quiescent current. Pololu 5597

Crowtail-Rotary Angle Sensor 2.0 is an analog rotary-angle sensor with a 300° range, ideal for value adjustment in electronic projects. It is used in lighting control, volume regulation and user interfaces.

This compact board breaks out the pins of a microSD card connector necessary to interface with the card through SPI (Serial Peripheral Interface), and it can be directly integrated into 5 V systems thanks to its on board 3.3 V regulator and level shifting circuity. Pololu 2587

I2S digital-to-analog converter based on the PCM5122, offering high-quality stereo line-level output, hardware mode operation and optional configuration via I2C or SPI, designed for microcontrollers and Raspberry Pi. Adafruit 6421

A switching converter that regulates 18V from an input range of 2.6V to 20V. It offers high efficiency of 70-95% and the ability to operate with a continuous input current of up to 900mA and a peak current limit of 2.2A. With a switching frequency of 1.6MHz and a power-saving mode, it is suitable for both high-performance and low-power applications. Pololu 5587

Finger Vein Scanner Module (A) is an advanced biometric module for finger vein identification, offering a high level of security, low power consumption, and resistance to harsh environmental conditions. Its fully integrated design and support for standard communication protocols facilitate its use in smart locks, access control systems, and embedded devices, especially in applications requiring reliable user authentication without contact with the skin surface.