Home > Compressor, Debugging (F@*!$%!!), Effects Pedals > Debugging AMZ Q&D Compressor

Debugging AMZ Q&D Compressor

I put together an AMZ Q&D Compressor. I am having some difficulties and was wondering if anyone can offer some insight.

First – here is the tech page with the schematic – http://www.muzique.com/tech/2166.htm

It seems to work very well, except for the GATE pot. When the GATE pot is cranked all the way up, it works. If the GATE pot is anything less than dimed, I get horrendous feedback and squealing.

I did some voltage testing –

Q1 – 2n5457

D – 9 v
S – 5.46v
G – 4.5 v

U1 – 78LO5
1 – 5v
2 – 0v
3 – 9v

U2 – SSM2166
1 – 0v 14 – 4.95v
2 – .14v 13 – 2.25v
3 – 2.47v 12 – 0v
4 – 2.47v 11 – 4.95v
5 – 2.26v 10 – 1.42v
6 – 2.26v 9 – 4.95v
7 – 1.56v 8 – .58v

D1 – 9v

Other notes: I changed C6 to 10uf, as I play bass, and C8 to 100uf, to address any power supply hum.

If I turn the GAIN all the way down, I can back off of the GATE a bit, but it is all but unusable unless it is fully dimed.

Argh….

Q&D Compressor 1

Q&D Compressor 1

IMG_0091a

Advertisements
  1. No comments yet.
  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s

%d bloggers like this: