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Old 3rd December 2012, 06:07 AM   #1
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Join Date: Jun 2007
Default DCB1 questions,

I have already had a search and not found an answer to these.
if someone could help to answer i would be very grateful.

input resistor,
my stepped attenuator has a log curve and a constant ~9k output impedance,
i assume changing the input resistor (to ground) to 1M will be the correct thing to do?
Quote:
The input resistance of the attenuator circuit depends upon the
relay setting (the volume), but will always be above 22Kohm. The attenuator output impedance is a constant 8.9 Kohms
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Old 3rd December 2012, 10:25 PM   #2
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I think the general rule of thumb is 10 times higher, so if the buffer "sees" 9k then I would put in a 100k resistor to ground.
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Old 4th December 2012, 03:47 AM   #3
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I thought the 10x was when using Lin pots?
With a log pot I figured I only needed a pull down resistor in case of intermittent input connection.
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