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Old 24th April 2006, 05:25 PM   #1
LMC13 is offline LMC13  United States
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Default Simple Audio Mux

I need to make a basic audio mux, which will drive an 8-ohm .1 or .25W speaker from two different sources. Both sources will not drive at the same time. This is for a novelty device, so it has to be cheap. Sources might be either differential or single ended. Anyone know a simple circuit to do this?

I appreciate any help!
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Old 24th April 2006, 09:42 PM   #2
Tim__x is offline Tim__x  Canada
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Are you looking for a mixer or a multiplexer (Mux).
A multiplexer turns one source off and another on. A mixer outputs the sum of all inputs. If none of your inputs need to be muted then a multiple input inverting amplifier will do.
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Old 24th April 2006, 10:14 PM   #3
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Exactly. Do a search on virtual earth inputs/mixers.
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Old 25th April 2006, 10:53 AM   #4
LMC13 is offline LMC13  United States
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Only 1 source will drive the speaker at a time, so it would be a multiplexer rather than a mixer. I'd rather use discrete transistors than monolithic dual input amp for the sake of cost. I do have a digital control signal, which I can use to select which source would drive the speaker.

I'm not sure what searching on virtual earth means. www.virtualearth.com is a link to some sort of microsoft website. A search on yahoo for virtual earth doesn't yield any technology web sites (at least not in the first couple pages). I search for it here on diyAudio.com and came up blank too.

Thanks for the replies and help!
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Old 25th April 2006, 06:52 PM   #5
Tim__x is offline Tim__x  Canada
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You probably don't need a multiplexer. Like I said before, you only need a multiplexer if one source must be muted while the other plays. If one source is quiet while the other one is playing then you don't need muting and a mixer will work.

http://en.wikipedia.org/wiki/Virtual_ground

http://en.wikipedia.org/wiki/Operational_amplifier_applications
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