SOLVED Stompbox Fuzz Face bias issue

[JohnB]

Just recently completed the Stompbox Fuzz Face kit. I cannot get the bias below 5.4V. The pedal works just fine and sounds good but I would like to have the ability to adjust the bias to its proper setting (4.5V). I have checked reistor values, swapped the transistors, etc. Do I need a pot with a wider range (24K)? Other suggestions?
Thanks, Couldn't find anything related in my search here.

 

[swelchy]

First off welcome... Next.. read the stickies about the troubleshooting pages: Come back with pics or we will scorn you..


Picture pages picture pages...

 

[JohnB]

Photos as requested.

 

[Dostradamas]

What is your input voltage?

Looks like mine.

I adjusted to my ear rather than voltage (no one will ever know, but now i am curious.)



If you tested values and they are within tolerance, my mind jumps to input voltage.

 

[JohnB]

9V DC via a power supply. As I stated, it sounds good, but the bias is a little off and I would like to see if anyone knows how to correct this.

 

[swelchy]

what's the minimum voltage you can set and what is the highest you can set with your trimmer... and what value of trimmer was used for the build...... and like a mistake I measured recently.. are you measuring the correct transistor..

 

[JohnB]

Problem is solved! Turns out the power supply I was using (labeled as 9v output) was actually sending 12.5V to pedal. Used a true 9.5V power supply and now all is well.

 

[anevilspar7an]

Don't forget to mark the thread as solved, there is a thread at the top of the sub-forum that explains how to do it.