I made Big muff from http://www.generalguitargadgets.com/projects/17-distortion/108-big-muff-pi . I hear only hiss.
Voltage:
Q1,Q2,Q3:
C:4,78
B:0,75
E:0,15
Q4:
C:4,5
B:1,5
E:0,98
Can anyone help me?
Quote from: HitTive on August 28, 2012, 02:21:45 PM
I made Big muff from http://www.generalguitargadgets.com/projects/17-distortion/108-big-muff-pi . I hear only hiss.
Voltage:
Q1,Q2,Q3:
C:4,78
B:0,75
E:0,15
Q4:
C:4,5
B:1,5
E:0,98
Can anyone help me?
Those voltages look fine to me. I'm terrible at debugging advice. Have you checked for solder bridges? Does the bypass work?
"what to do when it doesn't work" stickied at the top of this forum. Also, an audio probe would be an invaluable tool to use.
>I hear only hiss.
That implies to me that you have working transistor stages and somewhere you have a break in the signal chain. Turn down the sustain knob- does the hiss diminish? If so, your signal is probably OK after the sustain knob, but no good before. Suspect the jack wiring and anything before Q1's base.
Now, effect work (all potentiometer work) but I still hear loud hiss.
and i have no voltage on sustain potentiometer.
Wait.... does it work now? You hear the guitar signal? What changed?
Work backwards. I am guessing the hiss changes with the volume. Does the bass/treble content of the hiss change with the tone?
I just finished a pedal with the GGG board and mine is as quiet as can be (noise wise).
+1 on if the hiss changes with the sustain setting. Is the noise only when moving the pots?