Made a PCB w/ Eagle. Doesn't work. Is it my layout or the build? Ross Comp.

[jimmybjj]

First I am still new to making layouts. This is by far the most complicated i have done. I build it doesn't work   My electronics skill is limited so here is what i have done. All voltages are within spec according to the voltages listed at fuzz central. I have replaced the IC and all transistors. No solder bridges that i can find.

Symptoms. With effect on it does appear to slightly compress the sound. The "sustain" pot has little to no effect. The last one i built on the tonepad layout had no noise to lots as you turned up the "sustain" which is what i expected and i understand to be normal. This build has noise but it is consistent the entire travel of the pot it does not get louder or more abundant as i raise the sustain level.

The only deviation from the original is a switch to to lift c8 but i soldered those pads to it really isn't a factor.

Here is a pic of my layout if you might see any errors. Eagle doesn't show any and the voltages are correct so i doubt anything is wrong with the layout but I am still learning so who knows.

[Hides-His-Eyes]

If you removed C8 you shouldn't have done anything to those pads. A short there could be your problem.

[jimmybjj]

If you removed C8 you shouldn't have done anything to those pads. A short there could be your problem.

Thanks for taking the time to respond. I should have been more clear. The switch is to lift c8. C8 is still in place i just soldered the pads of the switch so that it matched the original schematic until i get the thing debuged.

[Hides-His-Eyes]

that makes good sense! Sorry I misunderstood you.

So you're seeing the correct voltages on the ICs, and it's passing signal, but it's not "compressing"?

Does the voltage reading on pin 5 change when you strum the guitar really hard?

[jimmybjj]

that makes good sense! Sorry I misunderstood you.

So you're seeing the correct voltages on the ICs, and it's passing signal, but it's not "compressing"?

Does the voltage reading on pin 5 change when you strum the guitar really hard?

Correct voltages are correct, but I will post the voltages if you think hat might help. It is passing signal and It sounds compressed (maybe) but the "sustain" pot does not have an effect on anything.

I will check the out put of pin 5 when I get home. Thanks again.

[jimmybjj]

ok here are my voltages

Power Supply 8.92v

ic
1
2  4.59v
3  4.59v
4
5  0.628v
6  2.698v
7  8.92v
8 

pin 5 of ic is at 0.698v while playing vigorously it ranged from 0.672-0.703v



q1
c  7.71v
b  1.73v
e  1.21v

q2
c  6.77v
b  2.698v
e  2.139v

q3
c  8.78v
b  0v
e  0v

q4
c  8.79v
b  0v
e  0v

q5
c  8.39v
b  8.79v
e  8.92v

[jimmybjj]

Ok so I was reading this thread trying to figure this thing out.

http://www.diystompboxes.com/smfforum/index.php?topic=86679.0

Jdoyle mention the the Base below the emitter means the transistor is off, this is certainly the case for q5 my voltages are wrong also it is only below like .2v so that doesn't suggest missorientation. What does this suggest to the more educated? Also jdoyle mentioned that q5 turns on the circuit. Does this mean that I have another problem since I am actually getting output with the circuit engaged? And the last point I gleaned from jdoyes post is that the emitters of q1 and q2 should be around 2.4v, q1 is most than a volt under this. When I get home I will be checking the surrounding components but is there anything you guys can glean or give advise on from he information I have given?