madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: tuffteef on June 24, 2012, 06:01:03 AM

Title: Mudbunny Civil War Issues
Post by: tuffteef on June 24, 2012, 06:01:03 AM
alo!

so i built a civil war muff with the mud boards its been working great but has mysteriously stopped working properly

im not sure whats going on but ive checked contin with the switch and all the wiring and checked for shorts
which are all fine

everything still wipes but all i get is a fizzy crackling when playing guitar through it

heres some voltages

Q1
E 4.50
B 0.74
C 0.14

Q2
E 4.50
B 0.74
C 0.14

Q3
E 7.96
B .01
C .01

Q4
E 5.47
B 1.38
C 0.87

ive probed around from Q3 to check for contin but other then that i dont know where to go
any help would be lovely!
Title: Re: Mudbunny Civil War Issues
Post by: jball85 on July 25, 2012, 03:47:17 AM
I know this doesnt help, but when you do get it working.... run a ts type overdrive into it. Badass!!
Title: Re: Mudbunny Civil War Issues
Post by: jimmybjj on July 25, 2012, 03:16:21 PM
I think you meant to put the emitter label where the collector is and visa Versa. The base should be about a diode drop above the emitter (0.6v) so it looks like q1 and 2 are of and things look off at q3. Crackling sounds like a misbiased transistor. I'd start looking for wrong resistor values, solder bridges, and reflow the solder joints around q3.

Before all of that I would suggest you read and follow Jacobs thread about making and using a test rig http://www.madbeanpedals.com/forum/index.php?topic=1140.0 

Pic can never hurt either. Some of the guys around here can pick out a flaw/error in seconds.