Debugging a Green Russian Big Muff

[Shawbrook]

My Green Russian Big Muff doesn't work!

1.What does it do, not do, and sound like?
Bypass signal is ok, but when the pedal is turned on there is only hiss. Also the LED doesn't work - it did the first time I turned the pedal on. It fainted after about a second and hasn't worked since. The pots seem to work fine (they change the sound of the signal and the volume pot works as it should).

2.Name of the circuit =
Green Russian Big Muff

3.Source of the circuit (URL of schematic or project) =
http://diy-layout.com/9

4.Any modifications to the circuit? Y or N; 5.Any parts substitutions? If yes, list them. ;6.Positive ground to negative ground conversion? Y or N
N.

7.
Voltage at the circuit board end of the red battery lead = around 9,30 V, same on the 9+ connections and where the battery connects to the DC jack.
Voltage at the circuit board end of the black battery lead = 0 V.

Q1:
E = 0,15 V
B = 0,73
C = 4,59

Q2:
E = 0,15 V
B = 0,73
C = 4,57

Q3:
E = 0,14 V
B = 0,71
C = 4,47

Q4:
E = 0,95 V
B = 1,42
C = 4,51

D1:
A = 0,73
K = 0,49

D2:
A = 0,49
K = 0,73

D3:
A = 0,71
K = 0,48 - 0,49

D4:
A = 0,48 - 0,49
K = 0,71

Electrolytic cap: 9,32 V at +, 0 at -.

I also measured the lugs of the LED when the pedal is turned on: 9V at + and 0 at -.

I hope someone can help me!   If I forgot any value or anything let me know. Thanks!

[StereoKills]

For the LED, do you have a current limiting resistor? You should not have a full 9v difference between the anode and cathode... You may have to replace the LED if it burned out.
Voltages look good other than that I believe.
Check the switch/bypass wiring (What wiring diagram did you follow?) - If that's all good you may want to use an audio probe to trace the signal through the circuit.

[Shawbrook]

I used this for the wiring: http://www.diystompboxes.com/smfforum/index.php?topic=970.0. The one with the DC jack. It seems to be fine.

And no, I didn't use a resistor for the LED. I didn't order one with my parts (because this is my first project not from a kit and I've never wired a resistor to a LED before, they don't let you do that in kits). Stupid, I guess.

[StereoKills]

To figure out what value resistor to use, just plug the info from the LED's datasheet (forward voltage and current) into a calculator (http://led.linear1.org/1led.wiz).
You'll need to swap out that LED for a fresh one.