Pez 45 - What is wrong?

[Lbzg]

Hi,


Can someone please tell me what is wrong with my Pez 45 from Tonepad?

I have used all parts except 3.9m i used 3.3m...

And it does not work...no phased sound coming out...


Any ideas?

[Seljer]

I'd reccomend you clean the flux residue from soldering off your PCB with some isopropyl alcohol and a toothbrush.

Do you have a multimeter? Read the debugging thread at the top of this forum and get some voltage measurements we'll have a much easier time helping you to get your pedal working

[R O Tiree]

The solder-side picture is really blurred and unclear, so it's impossible to see what's going on there. If you could take another picture and ensure that it is really clear, then that would be good.

One of the things I always do after etching a board is to probe each trace with my multi-meter. I place one probe on a trace and then touch each pad in turn that should be connected to that trace. Then, still keeping one probe on the trace I'm testing, I touch each trace that is near it.  These tests prove not only that each trace is complete, but also that there are no little bits of un-etched copper shorting out traces that are next to each other.  This means that, whatever else I have managed to do wrong, it can not be a short-circuit or break in the copper, and that makes de-bugging a lot easier.

[bluebunny]

^^ Do what these guys say.  Assuming all is OK with your build, did you match the JFETs?  And did you dial in the phasing with the trimmer?  I see that you appear to have taken the trimmer off board for some reason...  Anyway, it's a set-and-forget - not for external twiddling.

[Lbzg]

Here are my readings on IC 1 and 2.

On IC1 I have these:

1 - 0
2 - 0
3 - 0
4 - 7.50
5 - 0
6 - 0
7 - 0
8 - minus 4.50

On IC2 I have these:

1 - 0
2 - 0
3 - 0
4 - 4.50
5 - 2.82
6 - 0.50 (goes up and down)
7 - 1.50
8 - minus 3.50


Those help? Is this good?

[R O Tiree]

I think you might have measured some of those voltages with reference to Vb, not GND. You should not get negative voltages on this circuit. Put the black probe on the GND trace and then use the red probe to read the voltages and then re-post?

Cheers