Mono To Stereo Synthesizer

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Author	Views	Views Today	Rank	Comments
oRbEq	137,360	4		18

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

Notes

This circuit was sent in by oRbEq (email address unavailable).

S2 controls power to the circuit. Switching S1 to ground bypasses the circuit and outputs mono sound to both output jacks. Setting S1 to R1 enables the synthesized stereo sound at the outputs.

The circuit draws very little current and can thus be powered by most any well filtered 9V-12V source (including a standard 9V radio battery).

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Comments

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melson tell the name of 2nd ic Saturday, July 09, 2016 4:38:07 AM

i'm in india i have found some fm redio with two ic one is Hwcat cxa1619bs the second one is.. i dont that ic name upone that ic it has written 3810 BEL 9BC can u pls tell that name of that ic pls

anonymous Mono To Stereo Synthesizer Sunday, November 30, 2014 8:56:52 AM

If the editor took the time to leave a smart comment, why not update the parts list at the same time?
(Editor's notes: What's up with the parts list?)

anonymous Mono To Stereo Synthesizer Wednesday, April 27, 2011 3:16:08 PM

...and it's still not been changed. Typical of a couldn't care attitude which is increasing on WEB!
(Editor's notes: Because you know, operating the largest independent electronics site on the Internet is not time consuming at all, and a tiny error like this is just so high on the priority list because there's absolutely nothing else needed on the site at all at the moment.)

gccradioscience Mono To Stereo Synthesizer > Where is the IC? Tuesday, November 23, 2010 2:15:39 PM

I am having trouble finding this IC (TBA3810) to build this circuit. I need your help if you help me find sources on how to get this IC. This IC sounds very rare and discontinued. I will be using this circuit for low power part 15 broadcast on FM to take music that is mono and turn it into stereo, and also use it for my WiFI radio, connect it to an low powered stereo headphone amplifer to hear talk shows in stereo.
(Editor's notes: There is a mistake in the parts list. The part number should be TDA not TBA. Will fix this soon...)

anonymous Mono To Stereo Synthesizer Sunday, February 08, 2009 4:26:32 PM

hi, I can replace the tda3810? I live in Portugal and I can get this ic...

anonymous what is the TBA3810 (442-794) Thursday, October 23, 2008 6:33:18 PM

SHURE, THERE'S MISTAKE IN PARTS LIST: TDA3810 datasheet

v.vinoth Mono To Stereo Synthesizer Friday, February 08, 2008 6:14:09 AM

*what is a value of C13?

anonymous Mono To Stereo Synthesizer Tuesday, January 22, 2008 4:44:56 AM

C13 = 0.033uF Ceramic Disc Capacitor

dinesh Mono To Stereo Synthesizer Monday, December 03, 2007 9:59:59 AM

what is the value of c13

david paolo Mono To Stereo Synthesizer Wednesday, November 28, 2007 4:53:43 AM

any substitute for the tba3810 ic?

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melson	tell the name of 2nd ic	Saturday, July 09, 2016 4:38:07 AM
i'm in india i have found some fm redio with two ic one is Hwcat cxa1619bs the second one is.. i dont that ic name upone that ic it has written 3810 BEL 9BC can u pls tell that name of that ic pls
anonymous	Mono To Stereo Synthesizer	Sunday, November 30, 2014 8:56:52 AM
If the editor took the time to leave a smart comment, why not update the parts list at the same time? (Editor's notes: What's up with the parts list?)
anonymous	Mono To Stereo Synthesizer	Wednesday, April 27, 2011 3:16:08 PM
...and it's still not been changed. Typical of a couldn't care attitude which is increasing on WEB! (Editor's notes: Because you know, operating the largest independent electronics site on the Internet is not time consuming at all, and a tiny error like this is just so high on the priority list because there's absolutely nothing else needed on the site at all at the moment.)
gccradioscience	Mono To Stereo Synthesizer > Where is the IC?	Tuesday, November 23, 2010 2:15:39 PM
I am having trouble finding this IC (TBA3810) to build this circuit. I need your help if you help me find sources on how to get this IC. This IC sounds very rare and discontinued. I will be using this circuit for low power part 15 broadcast on FM to take music that is mono and turn it into stereo, and also use it for my WiFI radio, connect it to an low powered stereo headphone amplifer to hear talk shows in stereo. (Editor's notes: There is a mistake in the parts list. The part number should be TDA not TBA. Will fix this soon...)
anonymous	Mono To Stereo Synthesizer	Sunday, February 08, 2009 4:26:32 PM
hi, I can replace the tda3810? I live in Portugal and I can get this ic...
anonymous	what is the TBA3810 (442-794)	Thursday, October 23, 2008 6:33:18 PM
SHURE, THERE'S MISTAKE IN PARTS LIST: TDA3810 datasheet
v.vinoth	Mono To Stereo Synthesizer	Friday, February 08, 2008 6:14:09 AM
*what is a value of C13?
anonymous	Mono To Stereo Synthesizer	Tuesday, January 22, 2008 4:44:56 AM
C13 = 0.033uF Ceramic Disc Capacitor
dinesh	Mono To Stereo Synthesizer	Monday, December 03, 2007 9:59:59 AM
what is the value of c13
david paolo	Mono To Stereo Synthesizer	Wednesday, November 28, 2007 4:53:43 AM
any substitute for the tba3810 ic?