Print Page - Glam bias voltage

Title: Glam bias voltage
Post by: Dawnofzion on September 20, 2016, 02:51:49 AM

I finished up a glam build this evening and tried to bias the pedal. The lowest I could get the voltage was 7.3v. I couldn't get it down to the specified 6v. I tried the pedal and it seemed to work ok. I ended up using a bourns 3386 trimmer that is 50k. Could this be the problem?

Title: Re: Glam bias voltage
Post by: mattlee0037 on September 22, 2016, 03:10:23 PM

I would test the trimmer out of circuit if possible

Title: Re: Glam bias voltage
Post by: /)an/)an on October 09, 2016, 07:16:09 AM

This happened to me, any ideas?

Title: Re: Glam bias voltage
Post by: madbean on October 10, 2016, 02:32:16 PM

It's a bit unusual for a 50k trimmer to not be enough to bias, but going up to a 100k should solve the problem. To satisfy my curiosity - where did you get the 2N5457 from?

Title: Re: Glam bias voltage
Post by: /)an/)an on October 11, 2016, 04:15:50 AM

I got mine off ebay...bit of a newbie and its happened with a couple jfet builds, have wondered if its due to the transistor being el cheapo. ..

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Projects => Tech Help - Projects Page => Topic started by: Dawnofzion on September 20, 2016, 02:51:49 AM