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Old 28th May 2004, 10:52 PM   #1
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Question Amp Input: XLR & RCA switching

I was wondering how I could do XLR/RCA input switching for my amplifier.

I suppose using a simple switch is possible, but I'd like some sort of circuit that leaves the switch out of the signal chain. I've got no problem with an extra opamp though. Is there any way to do such a thing or not?
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Old 29th May 2004, 02:59 PM   #2
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No one knows?

* To mods: Sorry, I posted this in the wrong forum. Could it please be moved to the chip amp forum? Thanks!
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Old 29th May 2004, 04:01 PM   #3
tiroth is offline tiroth  United States
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Just connect them in parallel and use a shorting jumper or switch to connect IN- to ground. Since only the ground connection goes through the switch, I think this is fine.

This is how Pass Labs does it (jumpers).
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Old 29th May 2004, 06:15 PM   #4
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I guess I could just as well use tiroth's trick, but I just thought about this and wondered if it would work. Will there be crosstalk between the inputs?
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Old 29th May 2004, 08:52 PM   #5
moamps is offline moamps  Croatia
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Quote:
Originally posted by Devil_H@ck
...... but I just thought about this and wondered if it would work....
Hi,
In your schematic active input is loaded with only 100ohm what is unnecessary low. Also, inactive input is shortened to ground what also isn't good.
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Old 29th May 2004, 09:54 PM   #6
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Ah well, I guess I won't use any switch at all. I guess I'll be smart enough not to connect 2 input signals at once to my amp .
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