Snow White Auto Wah, no change in signal through board. Please help.

Started by Vicval01, August 08, 2018, 05:14:32 AM

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Vicval01

After a successful basic Bazz Fuzz build, I had a crack at the Snow White Auto Wah.
I'm getting signal through bypass, and the same through the board, with a slight difference when I manipulate one of the pots, but it is barely discernible.
Here's the link to the build:http://tagboardeffects.blogspot.com/2013/04/mad-professor-snow-white-autowah.html

Here are the voltages:
Input voltage = 9.35

IC 1
1. 1.24   16. 1.22
2. 0        15. 0.1
3. 4.16   14. 4.15
4. 4.16   13. 4.15
5. 5.33   12. 5.37
6. 0        11. 8.30
7. 5.33   10. 5.37
8. 4.14   9. 4.17

IC 2
1. 2.04   14. 3.88
2. 4.09   13. 4.15
3. 4.15   12 4.14
4. 8.30   11. 0
5. 4.15   10. 4.10
6. 4.16   9. 4.15
7. 4.15   8. 4.15

D1 A 5.05 K 8.30  K is higher than A, is that right?

D2 A 9.38 K 8.67

D3 A 4.08 K 4.05

D4 A 2.38 K 2.02

D5 A 5.00 K 4.15

VR I 5.05  G 0   O 8.30

Q1 D 8.3 S 5.74 G 2.05

Q2 C 5.04 B 2.06 E 1.72

Q3 C 5.05 B 2.50 E 1.23

I've attached a couple of photos.
Much appreciated.





Thanks in advance.

Kipper4



Not sure if the IC numbering is related.
You dont say if you made the std version or the modded one.?????


http://tagboardeffects.blogspot.com/2013/04/mad-professor-snow-white-autowah.html


Ma throats as dry as an overcooked kipper.


Smoke me a Kipper. I'll be back for breakfast.

Grey Paper.
http://www.aronnelson.com/DIYFiles/up/

Vicval01

Thanks for your reply, sorry, not sure when you say, "Not sure if the IC numbering is related."
Made the modded version.

Kipper4

What I mean is. I'm not sure the ic numbers in the schematic match the ones in the vero layout.

Go ahead and search the forum for the snow white , debugging, voltages, problems.

You will surely come up with some useful results
Ma throats as dry as an overcooked kipper.


Smoke me a Kipper. I'll be back for breakfast.

Grey Paper.
http://www.aronnelson.com/DIYFiles/up/