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.

Schematic

Parts

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

Source: http://www.hqew.net/circuit-diagram/Mono-To-Stereo-Synthesizer_12902.html