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Mono To Stereo Synthesizer

Mono To Stereo Synthesizer

This circuit attempts to liven up mono sound sources by simulating a stereo signal. It does this by shifting certain frequencies between left and right to fool the ear. It can often produce a passable mock stereo sound to bring some depth to otherwise flat recordings. Of course, there is no way to produce real stereo sound from a purely mono source unless the synthesizer had a way to tell which direction the original sound came from, but an illusion is generally enough for all but the hard core audiophile.
Part Total Qty. Description Substitutions

R1 1 4.7K 1/4W Resistor
R2 1 10K 1/4W Resistor
R3 1 12K 1/4W Resistor
R4, R6 2 22K 1/4W Resistor
R5 1 11.K 1% 1/4W Resistor
R7 1 16K 1/4W Resistor
R8 1 100K 1/4W Resistor
R9 1 24K 1/4W Resistor
R10 1 18K 1/4W Resistor
C1 1 0.1uF Ceramic Disc Capacitor
C2, C3 2 0.47uF Ceramic Disc Capacitor
C4, C5, C7 3 0.01uF Ceramic Disc Capacitor
C6 1 0.013uF Ceramic Disc Capacitor
C8, C9 2 4.7uF 25V Electrolytic Capacitor
C10 1 0.22uF Capacitor
C11 1 47uF 25V Electrolytic Capacitor
C12 1 100uF 25V Electrolytic Capacitor
D1 1 LED (Red, Green or Orange)
U1 1 TBA3810 (442-794)
S1 1 SPDT Switch
S2 1 SPST Switch
J1, J2, J3 3 RCA Jack Other suitable jack
MISC 1 PC Board, Wire, Case, Holder for D1, Socket for U1


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