Help debugging a Tonepad Big Muff Pi

[BernieRunns]

1. Tonepad Big Muff Pi stock
2. http://www.tonepad.com/getFile.asp?id=94
3. I followed the layout with the exception of subbing a 12k resistor in place of the 15k in R4; R10; and R15. And I used a 470pf cap in place of the 500pf. I also used two dual gang linear taper pots in place of the single gang 100k audio pots because that's all I had. Everything was placed on a tonepad board I received today.
5. I'm not sure whether it was a positive or negative ground circuit but I followed the offboard layout provided by tonepad. Wiring diagram #5
http://www.tonepad.com/getFile.asp?id=76

Q1

C 11.67
B 3.26
E 0.10

Q2

C 11.67
B 3.26
E 0.10


Q3

C 11.31
B 3.26
E 0.10


Q4

C 2.20
B 5.22
E 9.96


D1

A 7.26
K 3.26


D2

A 3.26
K 7.28



D3

A 7.25
K 3.26


D4

A 3.26
K 7.26
I hope that is right.




It doesn't make a sound bypassed or not. well actually it makes a rhythmic sound when turned on.

Any help would be great, I'm new at this and would love to see this be a success.

Thanks.

[armdnrdy]

Brian,

I may be taking a big leap here but......I have the feeling that your build doesn't work...right?

You have to tell us what it does or doesn't do if we are to offer some suggestions as to what the problem may be.

http://www.diystompboxes.com/wiki/index.php?title=Debugging

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

[BernieRunns]

Sorry, I posted too soon. Went back and modified the original post. The picture might be a little big...

Anyway it doesn't make any guitar sounds, haha. It kind of pops rhythmically when turned on.

[armdnrdy]

Do you get a "clean" signal when the switch is bypassed?

[BernieRunns]

No clean signal. No signal at all. I posted some meter readings in the original post above but I don't know what the mean.

[armdnrdy]

Okay...let's work at getting you a clean signal first.

Since you have a meter, check the continuity of the switch. Judging by the crispy look of the wires...you may have fried the switch.

The upper right connection on the switch looks a bit troublesome from the photo view.

After you check continuity of the switch, check continuity from each switch lug to the wires destination.

Also, double check the switch wiring (it's kind of hard to see in the photo)
I noticed you used Tonepad switching diagram #5 but didn't install a battery clip. Double check the wiring.

[BernieRunns]

I rewired the switch, I'm going to check for continuity now. Maybe this looks better. I used a different wiring scheme from http://tagboardeffects.blogspot.com/2012/02/offboard-wiring.html.

[BernieRunns]

I have continuity from the ground pole on the power supply to the switch. I'm not sure what else I should check...

[armdnrdy]

I'm not sure what you have going on with your switch but....wire it like this.

http://www.aronnelson.com/gallery/main.php/v/diyuser/Bypass+switch.jpg.html

Make sure that the switch is oriented the same way as in your pictures. The pins should be running horizontally .

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[BernieRunns]

Thank you so much for your time, I don't know what I did but it's working and sounds great. Thank you.

[BernieRunns]

I figured out that it was a bad cable....... It's always the little things. Now if I can only get this rebote pedal working.