If this is not related to the question you raised please ignore it. Rich If you have a stereo and you use only one channel, it is mono. There is no conversion necessary. If you have a balance control, simply move the balance pot to maximum at the channel you use. If you are using PWM input signals you may need to consider the capacitive coupling in your amplifier. You may need to make some modification there. The best bet is to put your scope in the output and compare it to the input. ----- Original Message ----- From: "Martin K" To: "Microcontroller discussion list - Public." Sent: Sunday, January 29, 2006 4:57 PM Subject: Re: Stereo -> mono conversion > Marcel Birthelmer wrote: > >>Hi all, >>what would be a good way to convert stereo audio to mono? This can be >>either PCM or as an analog circuit. I'm trying to keep things as simple >>as possible, so some noise (not too much) is ok. >>- Marcel >> >> > I think you would use an opamp with two inputs. In some applications the > signals might be a bit out of phase giving a strange output. > I think in radio they use a mixing scheme where the left output is > transmitted containing part of the right signal as a hack for mono-only > radios. > I base that assumption on listening to some Beatles tracks that used a > lot of fading, so don't take it to heart :) > > -- > Martin K > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist