Fuzz w boost no sound??

[arawn]

     Re: Fuzz boost Question
« Reply #2 on: July 25, 2007, 10:02:33 PM »   

--------------------------------------------------------------------------------

1. NPN Boost By Gus Smalley from diystompboxes.com, Unnamed Fuzz by Doug deeper from SSGuitar.com
2. http://www.diystompboxes.com/smfforum/index.php?topic=763.0, http://www.ssguitar.com/index.php?topic=378.0
3.Built on ic pc board, and perf board
4. Modifications- 10k linear potentiometer on gain circuit of fuzz (between pins 1 and 8 of lm386n), power for fuzz is coming from booster, input is to fuzz output is from booster, dpdt no led switch mod from diystompboxes.com
5.negative signal ground
6.it does nothing when switched on , bypass works fine
7. Battery measures 8.55 volts  off circuit and 8.50 after testing on circuit
8. Voltage at the circuit board end of the red battery lead =8.52
Voltage at the circuit board end of the black battery lead =0.00

NPN Booster by Gus Smalley
Q1 = only transistor
C = 161.3 mv
B = .812v
E = 161.0 mv

Potentiometer 5k audio
Left Lug = 0.00 mv
Center lug = 157.6 mv
Right Lug 157.6 mv

Unknown Fuzz
IC1 lm386n
P1 = 1.336v
P2 = 6.1v
P3 = 5.6v
P4 = 0.00v
P5 = 4.14v
P6 = 8.49v
P7 = not used 4.29v
P8 = 1.346v

D1 1n914
A (anode, the non-band end) = 276.3 mv
K (cathode, the banded end) = 332.6 mv

D2 1n914
A = 234.2 mv
K = 214.6 mv

pot  10k linear
Left lug  = 1.346v
Center lug  = 1.346v
Right lug = 1.341v

DPDT switch (on position)
Left
1 = 6.6v
2 = 6.6v
3 = 283.6mv
Right
1 = 160.9mv
2 = 195.6mv
3 = -212.2mv


Output jack positive
160.8 mv

The only thin I did not follow to the letter was to tie one 9v battery to both pedals Using the common ground and v+ on the booster