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PostPosted: Tue Feb 08, 2022 3:41 pm 
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I've completed the Envelope Filter / Fixed Wah kit. After assembly, it seems to work fine, except for the fact that the sensitivity pot needs to be turned all the way up (clockwise) to work.

bypass works, manual works. All of the other knobs seem to do what they are supposed to do.

I did pull it apart and look on the bottom side of the PCB (since you solder in the pots from the top/component side. It seemed some solder had somehow dripped and bridged 2 of the pins on the Sensitivity pot. I fixed that problem and re-flowed a few other joints I saw that popped out as being problematic. After testing again, the Sensitivity knob seems to work more of the range, but eventually gets to a point where it cuts out and won't register any notes, no matter how hard I attack. I also did check to make sure the pots were installed in the correct position.

I do plan on going back and reflowing all of the points. Thats definitely a takeaway I've seen here many time.

Outside of that, is there any specific spot I should hone in on that would cause just the Sensitivity knob to not work through about half or a little less its range?

also - on the foot switch, it does look like in one pic that the 4-9 bridge wire is touching adjacent pins, but it is not.

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PostPosted: Wed Feb 09, 2022 2:27 pm 
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What you're describing doesn't sound out of the ordinary. The sensitivity knob is really an input level control to the envelop trigger. The trigger circuit is not a very complex circuit. While you can adjust the sensitivity a tiny bit, the circuit has a pretty small window of input signal level that it likes. If it gets too much signal or too little signal, it just doesn't work. So it's probably more helpful to think of the sensitivity pot as only have 1 or 2 "positions" that actually work. It's really there more to adjust between single coils, humbuckers, and active pups.

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PostPosted: Wed Feb 09, 2022 2:47 pm 
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Unrelated to your topic, you should install that jumper between lugs 3 and 6 of the footswitch (bottom left and bottom middle).

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PostPosted: Wed Feb 09, 2022 3:38 pm 
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byoc wrote:
What you're describing doesn't sound out of the ordinary. The sensitivity knob is really an input level control to the envelop trigger. The trigger circuit is not a very complex circuit. While you can adjust the sensitivity a tiny bit, the circuit has a pretty small window of input signal level that it likes. If it gets too much signal or too little signal, it just doesn't work. So it's probably more helpful to think of the sensitivity pot as only have 1 or 2 "positions" that actually work. It's really there more to adjust between single coils, humbuckers, and active pups.


Ok good to know - so as long as it works through some of its range, its pretty much in spec if it stops working at some point? I was kind of wondering that as I was posting this.


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PostPosted: Wed Feb 09, 2022 3:39 pm 
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sjaustin wrote:
Unrelated to your topic, you should install that jumper between lugs 3 and 6 of the footswitch (bottom left and bottom middle).


Ah yes, I have no idea how I missed doing that! Thank you.


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