Bass knob Clicking noise

[Ofek Deitch]

Hi

I just finished another Colorsound Overdriver Clone, and when I tested it I found out that when you turn the Bass knob, it makes a weird clicking or scratching noise.

To build this clone I used the schematic from FuzzCentral:



The effect works and sounds great as usual, though I'm not sure what causes this problem. This isn't the first clone I made of this circuit, and I'm using the same layout as usual.

Could it be a faulty pot?
Voltages can be posted if needed, though the effect itself works so I don't think it's necessary.

Thanks!
Ofek 

[JPGraphX]

Last time I got a scratchy pot was because there was DC on it. Look at your caps, you must have reverse one (electrolytic)

[Ofek Deitch]

Ok, so I went over the circuit board, and none of the Elctrolytic caps are reversed.
I noticed though that there's a spot on the pot that it is hard to turn the shaft, and when you do signal also changes a bit.
Is it possible that I put to much solder onto the pot's lug?

[JPGraphX]

Try to clean it!

[slacker]

The 4.7uF cap connected to the collector of the third transistor is the wrong way round on that schematic, I don't know if that would cause the problem you have though.

[Lurco]

http://www.diystompboxes.com/smfforum/index.php?topic=103928.msg928616#msg928616

[Davelectro]

The 4.7uF cap connected to the collector of the third transistor is the wrong way round on that schematic

Exactly.

Besides, a 100nF cap across the bass pot is missing. Stay away from that schematic and search for the one from Sola Sound.

[Ofek Deitch]

Just replaced the pot, and everything is back to working order..
I don't think there's a problem with the scheme I used, it's just a bad pot