Author Topic: Easy fuzz bias question- I should know this  (Read 1060 times)

jimbob

Easy fuzz bias question- I should know this
« on: July 16, 2008, 02:30:12 PM »
I have a set of germ transistors from small bear that came with values. I used these same values and it seems the bias is off. The resistor listed for what would normally be a 8.2k or a 10k trim is listed as a 12k resistor. I used a 12k and still not right. What could/would/should I use as a trim pot to bias? 20k pot? etc?? I tried a 20kw I had lying around from a Tube screamer build and it really didn't go right. Am I off here in my train of thought?
"I think somebody should come up with a way to breed a very large shrimp. That way, you could ride him, then after you camped at night, you could eat him. How about it, science?"

John Lyons

Re: Easy fuzz bias question- I should know this
« Reply #1 on: July 16, 2008, 04:14:14 PM »
The resistor off the collector is the one you want.
With a 20K pot as a trimmer you should be able to dial in 4.5v or close.
What voltages were you able to get. (measured at the collector of course)

john
Basic Audio Pedals
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