@awylie
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Hi Billy,
I’m SO sorry for not responding! Life got in the way there for a while! I do really appreciate the help and suggestions.
Since I last posted, I have replaced the J201s with matched 5457s and the trim pot to a 300K trimmer.
The result is the same. Unchanged sound engaged or bypassed. By the way I did the 2/4 stage mod as well.
To answer your last question, I’m located in Ontario Canada.
Thanks very much. I’ll swap out the j201s and the trimmer and will let you know how I made out.
Alex
Final update…
It works!
I spent more time trying to understand the schematic and how to follow the signal path. As I mentioned early on, I have no electronics background so with my limited knowledge, I continued testing with the audio probe. I found one suspect component, the 4.7uf at C7. I replaced it and lo and behold, I have wah!
Thanks to you Cybercow for your help and immense patience. I have learned a lot and I thank you for that as well.
Now to get it into a box!
Regards,
Alex
okay. So I’ve been tracing the signal path from the input. I get as far as R7 which connects to one side of the fasel L1. I have signal at R4 and at one side of L1 I also get signal on one side of R7 but not the other and not at the R7 side of the fasel. As mentioned earlier, the fasel appears to be functional. All of my solders are good and clean. And as mentioned, I get output but no wah.
I’m once again stuck! I tested R7 and it’s fine. Why would I get signal on one side but not the other??
Thanks for the advice. I had to find out how to build a probe, which I did. Now I have to try and understand where to start probing! I’ll let you know! Thanks again.
I saw that too. Initially, I installed a Phillips 4 pin inductor and the only way it would line up with the mounting holes was to use the white pad. Because that didn’t work, I went to the Red Fasel. As the PCB groups two mounts inside a box, I used them. I also noted that the trace appears to connect the white pad to the pad directly below.
I will try relocating the Fasel and will let you know.
Update: Nope. No difference. R9 was reconnected. TR1 still has no effect.
I saw that too. Initially, I installed a Phillips 4 pin inductor and the only way it would line up with the mounting holes was to use the white pad. Because that didn’t work, I went to the Red Fasel. As the PCB groups two mounts inside a box, I used them. I also noted that the trace appears to connect the white pad to the pad directly below.
I will try relocating the Fasel and will let you know.
I had it backwards. TR1 wasn’t doing anything and TR2 was controlling volume. As you suggested, I disconnected R9 and when I tested, TR1 has no effect and TR2 is in fact still controlling volume.
With a guitar plugged in, the sound is quite trebly and harsh. SW1 does in fact add/remove some bass and SW1 has no effect.
The Red Fasel is from Dunlop. Purchased from Amazon. I don’t have the equipment to measure the mH, The Fasel came with no technical data but the web indicates that the Red Fasels should be between 500mH and 600mh.
No, I’m using J113 and 2n5088s from Barry. I’ve swapped them out for others (same parts) with no effect. TR1 is controlling volume but TR2 doesn’t seem to be doing anything.
Hi, good morning!
I understand that this isn’t an autowah. I plan to put this into a standard 1590N1 enclosure and hand-set the wah. For trouble shooting, I removed the foot switch so at this point it is always on. There is no change in tone when I turn the pot except when I get to the center of the sweep where I notice a slight change in background ‘hiss’. I have tested the pot and I read 100 at both ends, so it’s fine.
I’ve rechecked all of my connections and part values. I have also tried two different inductors. A phillips 4 pin (first) and then a Dunlop Red Fasel. Neither made any difference. I have also adjusted both trimpots and the only impact is to volume.
I am fairly uneducated when it comes to electronics ( I understand the basics) but one thing that comes to mind is that perhaps the way I’ve connected the jacks and power may be a factor. As you’ll see in the attached picture, there is only one ground going the the circuit board. Could this be the problem?
Thanks for responding
Thanks. Very much for the tips. I currently have a trim pot installed. I think I’ll swap it for an external one.
