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Wah Kit - bypass works, Wah silent

Moderators: geekmacdaddy, sjaustin, Non-Reverse, duhvoodooman, Stephen, Morgan, Matt

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72Slayer

Post subject: Wah Kit - bypass works, Wah silent

Posted: Fri Aug 09, 2019 11:59 am

Joined: Thu Aug 08, 2019 7:38 am
Posts: 5

Continuity from jacks to to switch and board tests good
Input voltage tests good
1st transistor 4.3v
all trimpots set to stock values (q=33K, gain=68K, mid=1.5K, bass=390)
Not sure of value for output buffer trimpot but I have it set at at 50K
10uF output cap read 4.6v
Op Amp
1=0v
2=4.2v
3=4.6v
4=0.15v
5=0.15v
6=4.5v
7=9.2v
8=0

Attachments:

Pot.jpg [ 138.25 KiB | Viewed 2964 times ]

Board Under.jpg [ 102.71 KiB | Viewed 2964 times ]

Board top.jpg [ 118.15 KiB | Viewed 2964 times ]

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72Slayer

Post subject: Re: Wah Kit - bypass works, Wah silent

Posted: Sat Aug 10, 2019 9:12 am

Joined: Thu Aug 08, 2019 7:38 am
Posts: 5

I did find an issue with the 1K resister on the bottom. Part of the coating had melted off and was touching the lead to the 2.2M resistor. I fixed that, but still silence on the wah channel.

any help?

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duhvoodooman

Post subject: Re: Wah Kit - bypass works, Wah silent

Posted: Sat Aug 10, 2019 10:07 am

Moderator

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16233
Location: Albany, NY

This process is often helpful for problems such as you're describing:

viewtopic.php?f=9&t=52188

The connections to the wah pot look particularly questionable. And what's the situation with the two green wires, which appear to be spliced to the black wire coming off eyelet #1 of the PCB?

Would also be helpful to see a photo of the footswitch wiring.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

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72Slayer

Post subject: Re: Wah Kit - bypass works, Wah silent

Posted: Sat Aug 10, 2019 2:27 pm

Joined: Thu Aug 08, 2019 7:38 am
Posts: 5

Found it. The .22uF cap to the 470K resistor....the pcb trace must have been overheated and shorted.

My God, this is a huge upgrade over the basic CryBaby GCB95

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duhvoodooman

Post subject: Re: Wah Kit - bypass works, Wah silent

Posted: Sat Aug 10, 2019 3:00 pm

Moderator

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16233
Location: Albany, NY

Well done! Enjoy!!

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

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