2channel audio mixer or switch with automatic src selection - Electronic Circuits Projects Diagrams Free

lexus · 6th January 2004, 12:03 PM

Hi,

I want to build an 2 stereo channels switch with automatic selection of an primary source. So, if on ch1 is a signal it is routed, if not, channel 2 is routed to output.

Can someone give me a link or some basic idea how to do this....

Maybe a good quality mixer is possible, too (If it is not to expensive).

Bye Dan

mozikluv · 7th January 2004, 10:11 AM

hi,

the audio mixer you can make, there are lots of mixer circuits in the net like at the http://www.discovercircuits.com

as to your auto selector, i dont get your conceive idea. you said if there is a signal in chan. 1 it is routed to the amp, if none, chan. 2 is routed.

what you really mean is, any signal that is inttroduced to the mixer regardless of which channel it appears will be sense by a circuit and rout it to the amp. that's a neat idea. am interested with whatever replies or ideas will be given

:wink:

what is needed here is a random signal sensor that samples all inputs with the presence of a signal. however there could be a problem like what would happen in case a another signal is introduce while there is an ongoing signal coming in :shock:

**Nigel Goodwin** · 7th January 2004, 11:47 AM

I think we really need more information, such as exactly what you are trying to do? - and why?.

If you want a switched source, it's not a mixer - and if you want a mixer, it's not a switched source.

Tell us exactly what you want to do, and we can probably make suggestions.

As for actually detecting audio, that's simple enough - just use a full-wave rectifier, just as you would for a VU meter. The tricky part is getting the timing correct, it needs to work like a PPM meter - with a quick attack and a slow decay - otherwise it would switch channels in between words - which, presumably, wouldn't be wanted. Adjustment of the timings would probably be a matter for experiment - you could probably use VOX (voice operated switching) for amateur radio transmitters as a starting point - they face the same critical timing considerations, and usually provide an adjustable delay control.

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6th January 2004, 12:03 PM	(permalink)
lexus	2channel audio mixer or switch with automatic src selection Hi, I want to build an 2 stereo channels switch with automatic selection of an primary source. So, if on ch1 is a signal it is routed, if not, channel 2 is routed to output. Can someone give me a link or some basic idea how to do this.... Maybe a good quality mixer is possible, too (If it is not to expensive). Bye Dan

7th January 2004, 10:11 AM	(permalink)
mozikluv	audio mixer hi, the audio mixer you can make, there are lots of mixer circuits in the net like at the http://www.discovercircuits.com as to your auto selector, i dont get your conceive idea. you said if there is a signal in chan. 1 it is routed to the amp, if none, chan. 2 is routed. what you really mean is, any signal that is inttroduced to the mixer regardless of which channel it appears will be sense by a circuit and rout it to the amp. that's a neat idea. am interested with whatever replies or ideas will be given :wink: what is needed here is a random signal sensor that samples all inputs with the presence of a signal. however there could be a problem like what would happen in case a another signal is introduce while there is an ongoing signal coming in :shock: __________________ \"NONE BUT THE BRAVE DESERVES THE FAIR\" ~Shakespeare~

7th January 2004, 11:47 AM	(permalink)
Nigel Goodwin	I think we really need more information, such as exactly what you are trying to do? - and why?. If you want a switched source, it's not a mixer - and if you want a mixer, it's not a switched source. Tell us exactly what you want to do, and we can probably make suggestions. As for actually detecting audio, that's simple enough - just use a full-wave rectifier, just as you would for a VU meter. The tricky part is getting the timing correct, it needs to work like a PPM meter - with a quick attack and a slow decay - otherwise it would switch channels in between words - which, presumably, wouldn't be wanted. Adjustment of the timings would probably be a matter for experiment - you could probably use VOX (voice operated switching) for amateur radio transmitters as a starting point - they face the same critical timing considerations, and usually provide an adjustable delay control.