Stereo to mono input

giralfino · 2nd October 2010, 05:19 PM

Hi all,
I have the following problem.

I built a small radio based on a mono FM tuner and a single channel amplifier. The output goes to a single speaker. Now I would also add an input for a CD, but don't want to add another amplifier and speaker, so I was thinking of converting the CD stereo output into a mono signal that can feed the (mono) amplifier.

I found the schematic for this solution (see photo), but would like to know if it is good or there are other better solutions not too complicated. If it is the correct way, are 1/8W resistors OK?

Thanks,
Ralf

bob91343 · 2nd October 2010, 06:01 PM

That should work well. If you use 1/8 Watt resistors, you can have as much as 11 Volts or so across each one, which is probably more than your CD player can put out. So yes, that is okay.

Frank Berry · 2nd October 2010, 06:16 PM

Depending on the output impedance of your CD player, you might want to increase the value of the resistors to something like 10K. The results will be the same but it may be an easier load impedance for the CD player.

Speedskater · 3rd October 2010, 02:27 PM

The Rane paper on Wye-ing:

Why Not Wye?

2nd October 2010, 06:16 PM	#3
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Depending on the output impedance of your CD player, you might want to increase the value of the resistors to something like 10K. The results will be the same but it may be an easier load impedance for the CD player. __________________ Frank

3rd October 2010, 02:27 PM	#4
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	The Rane paper on Wye-ing: Why Not Wye? __________________ Kevin

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2nd October 2010, 06:01 PM	#2
bob91343 diyAudio Member Join Date: Mar 2010	That should work well. If you use 1/8 Watt resistors, you can have as much as 11 Volts or so across each one, which is probably more than your CD player can put out. So yes, that is okay.