Debugging: "The Low Down" (chopped OC-2) by DC6FX

[elenore19]

Hey guys.
I'll try to make this quick as to not waste your time.
Build Doc:
https://drive.google.com/open?id=0B7QeV_7r70dTNE4xSHo4cHY3eEE
Board:
https://www.oshpark.com/shared_projects/RywmoHxm
Sound Clip: (I used a boost after the octave to get the signal up in this recording.)
https://drive.google.com/open?id=0Bye2ERj2uuOlZzNaQ05wRmZjNGJjX18tUGlJRC1ZeHExZnA0
Voltages:
TL074CN
1: 5.10    8: 5.10
2: 5.10    9: 5.10
3: 4.65  10: 4.77
4: 9.4    11: 0
5: 5.05  12: 4.77
6: 5.09  13: 5.10
7: 5.10  14: 5.10

CD4013BE
1: 0         8: 8.11
2: 9.40    9:  0
3: 5.04  10: 8.13
4: 0       11: 0
5: 9.40  12: 9.38
6: 0       13: 9.4
7: 0       14: 9.4

LM324N
1: 8.13    8: 5.03
2: 5.10    9: 5.10
3: 5.08  10: 5.07
4: 9.4    11: 0
5: 5.06  12: 5.08
6: 5.10  13: 5.08
7: 5.12  14: 8.14

Things that are different:
The chip I have is a CD4013BE (not sure if the "BE" part would change anything)
For C5 I have 2.2nf parallel with another 2.2nf. Making it 4.4nf which is lower than the 4.7nf.
Maybe that would cause the problem?
Problem:
It's very quiet and has a little bit of background high pitched fuzz.  (you can hear it even with both pots zero'd)
Both pots seem to do what they're supposed to, yet when cranked the overall volume is still lower than bypass tone.

Anyone have any ideas?
I can post voltages if those would be helpful.

Things that are different:
The chips I have have extra letters on them. Maybe this would cause the problem?
I'm using TL074CN, LM324N, CD4013BE.
For C5 I have 2.2nf parallel with another 2.2nf. Making it 4.4nf which is lower than the 4.7nf.
Maybe that would cause the problem?

Thanks for any help you can offer. It's greatly appreciated!

-Elliot

[Marcvv]

Hi Elliot,

Is this the latest or the first version of that board.
I remember, if I am correct, that diablochris had some issues with the first version and had to make some adaptions. There is a thread somewhere about that. I have a newer version, which I have not build yet, but that one has those things changed afaik. I did build Taylor's chopped oc-2 a long time ago.

Post voltages in any case so others can think with you.

Succes, Marc

[elenore19]

This is the latest version (as far as I know)
I put the voltages and soundclip in the original post.
Thanks for any help!

[elenore19]

One bump for good measure.