This device is a transistor-based microphone preamplifier designed for use with an electret microphone connected directly to the circuit input. The preamplifier increases the microphone signal level to values suitable for driving an audio amplifier or other audio equipment.
The circuit uses a single-supply power source in a wide voltage range from 3 to 12 V DC, allowing operation from batteries or fixed power supplies.
The output signal level can be adjusted by changing the value of a single resistor, enabling easy adaptation to different applications.
The printed circuit board has compact dimensions of 25 x 22 mm.

Technical Specifications:
Type: microphone preamplifier.
Design: transistor-based.
Microphone type: electret.
Supply voltage: 3 - 12 V DC.
Gain adjustment: by resistor value change.
Output: low-frequency audio signal.
PCB dimensions: 25 x 22 mm.

This product is a fully assembled module.
It is also available as a DIY assembly kit - Product code 1035 (separate product).