Stereo Simulator

Stereo simulator is used to separate monaural signal between two channels for passing higher and lower frequency. Here is a circuit of stereo simulator separate the mono signals at two middle frequencies i.e. 6 KHz and 250 Hz for providing more pleasant sound.

Circuit Description of stereo simulator

The heart of stereo simulator is quad-amp TL084 and the whole circuit is build around this IC.

The two separate mono signals are obtained from pin 1 of IC1. Where one passes to op-amp B through preset VR2 and other through two parallel T network to op-amp C. The R-C network used here is used to attenuate 6 KHz to 250 Hz frequency signal from output of left channel.

The op-amp B is configured in difference amplifier mode to get right-channel output as difference of signal at pin 5 and 6.

Preset VR2 and VR3 are used to control manually for the depth of stereo and for gain adjustment in the left channel respectively. While C3 and C­4 determine the sound of stereo so its value can be chosen suitably to obtain an attractive stereo sound.

stereo simulator


Resistors (all ¼-watt, ± 5% Carbon)

R1 R12 = 1 KΩ

R2, R8, R10, R15, R16 = 10 KΩ

R3 = 47 KΩ

R4, R5 = 2.2 KΩ

R6, R7, R9, R11, R14 = 27 KΩ

R13 = 12 KΩ

VR1, VR2 = 100 KΩ

VR3 = 10 KΩ


C1 = 10 µF/25V

C2, C5 = 0.1 µF

C3, C8, C9 = 22 nF

C4 = 47 nF

C6, C7 = 12 nF

C10, C11 = 470 µF/25V

C12, C13 = 100 µF/25V


IC1 = TL084/LM324 (quad op-amp)



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