The circuit represents a stereo audio mixer designed to mix up to four input signals. Inputs are provided for a tape deck, tuner, turntable and microphone, with each input adjustable according to the type and level of the signal source.
The circuit includes a preamplifier and tone control for low and high frequencies, allowing audio signal adjustment before feeding a power amplifier or recording device. The design is based on two TL084 (B084) operational amplifiers.
The power supply is dual-polarity and operates in the range of ±9 V to ±18 V DC. For powering the circuit, it is recommended to use the DIY kit model HK1032 - Unipolar to Bipolar Power Supply Converter, or model HK1033 - ±12V / 100mA Power Supply.
The printed circuit board dimensions are 67 x 65 mm.

Technical Specifications:
Type: stereo mixer (audio mixer).
Number of inputs: 4.
Input sources: tape deck, tuner, turntable, microphone.
Operational amplifiers: TL084 (B084).
Functions: preamplifier, low and high frequency tone control.
Supply voltage: ±9 V to ±18 V DC (dual supply).
PCB dimensions: 67 x 65 mm.

This product is a DIY assembly kit.