Author Topic: thumping w/volume down  (Read 3932 times)

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thumping w/volume down
« on: December 07, 2009, 07:35:47 PM »
I just built one of these. I didn't have any 5k pots on hand so I used a 10K. Also didn't have a 47uF cap, so I used a 33uF.

The circuit is working, but when I turn down the boost about 1/2 way, I get noise, and when I turn it down all the way I get thumping.

It doesn't seem to me that it would be the pot. Could it be the cap? I have some 100uF caps, would that work better than one that is too low in value?

aron

Re: thumping w/volume down
« Reply #1 on: December 07, 2009, 07:51:53 PM »
You can put a 10K resistor across the outer lugs of the pot to make it closer to 5K. Are you using a battery?

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Re: thumping w/volume down
« Reply #2 on: December 08, 2009, 01:59:54 AM »
You can put a 10K resistor across the outer lugs of the pot to make it closer to 5K. Are you using a battery?

10K resistor? I've never heard that trick.

Yes on the battery question. It is a fresh battery.

So it wouldn't be the cap? (not that it would be that hard to test)

aron

Re: thumping w/volume down
« Reply #3 on: December 10, 2009, 06:04:41 PM »
Think of a pot as a variable resistor. Now check out the FAQ regarding resistors in parallel.