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-   -   Preamp source selection using relays question. (http://www.diyaudio.com/forums/solid-state/148324-preamp-source-selection-using-relays-question.html)

sjalloq 30th July 2009 10:50 PM

Preamp source selection using relays question.
 
Hi there,

I'm building a preamp and will be using relays to switch the inputs. Are there any best practices I should follow to minimise input crosstalk? Grounding etc?

I've seen designs that use a large resistor to signal ground on each signal input and others that don't.

Thanks.

nigelwright7557 30th July 2009 10:51 PM

If high impedance inputs are left floating they can pick up hum and noise.

Jan Dupont 31st July 2009 03:48 AM

See this thread;
http://www.diyaudio.com/forums/showt...606&highlight=

AndrewT 31st July 2009 12:11 PM

try searching the Forum.
This has been discussed many times.

sjalloq 31st July 2009 12:20 PM

Andrew, you are a very knowledgeable chap, but you aren't half a rude so and so some times. Was there any real need to post that?

I did search. Just for the wrong terms it seems. I actually spent 30 mins trawling through non-relevant stuff before posting. But thanks for your helpful input in any case.

Juergen Knoop 31st July 2009 02:01 PM

Re: Preamp source selection using relays question.
 
Quote:

Originally posted by sjalloq


I've seen designs that use a large resistor to signal ground on each signal input and others that don't.

that's a usual precaution against dc over the relay contact, making switching 'pop- or clickless'. Otherwise a capacitor coupled floating source would charge the coupling cap over the contact.
regards


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