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Old 19th October 2007, 08:02 PM   #1
lpd is offline lpd  Canada
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Default Bleeder Cap Question

I recently built a volume pot with shunt resistor in a box. I then tried ot add a bleeder cap (200pf) and 75 ohm resistor to ground as suggested in a thread here. I found it removed some of the overall transparency. What would the purpose of adding a cap/resistor to input to ground other than rolling off the top frequencies?

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Old 19th October 2007, 08:11 PM   #2
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Got a link to the thread you mean? Seems a barmy idea if it's as you describe. Can't see what it could be bleeding either, other than the high frequencies down the drain.
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Old 19th October 2007, 09:08 PM   #3
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The 200pf cap and resistor will drain RF interference on the signal wire to ground.

Personally I'd do this at power amp chip input pin but this will depend on whether you have built your own amp :-)
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Old 19th October 2007, 10:14 PM   #4
lpd is offline lpd  Canada
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I tried it both with a 100K Alps pot, 10 shunt resistor, and 200pf/75 ohm resistor on the input to ground. Personally I find the bleeder doesn't just take the rf out, but it seems to bleed out some of the top end. Maybe I'm mistaking the rf noise as top end frequency.
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