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Old 30th July 2009, 11:50 PM   #1
sjalloq is offline sjalloq  United Kingdom
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Default 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.
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Old 30th July 2009, 11:51 PM   #2
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If high impedance inputs are left floating they can pick up hum and noise.
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Old 31st July 2009, 04:48 AM   #3
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See this thread;
preamp question
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Old 31st July 2009, 01:11 PM   #4
AndrewT is online now AndrewT  Scotland
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try searching the Forum.
This has been discussed many times.
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Old 31st July 2009, 01:20 PM   #5
sjalloq is offline sjalloq  United Kingdom
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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.
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Old 31st July 2009, 03:01 PM   #6
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Default 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.
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