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.

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

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

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

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.

Re: Preamp source selection using relays question.
 

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