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I did, in fact, goof 🙁 I was testing the wrong pin. But, I got it right tonight 🙂 Thanks for the redirection.
There is continuity between the middle pin of the depth pot and pin 23. And pin 23 measures zero to 4.988 as the depth knob is turned from min to max.
Is there a likely culprit (like stray solder) for connecting the depth pot to the rate LED? Everything works well once the rate LED starts blinking, including the tap switch. But thorough most of of its range, the depth control makes the rate LED stay on.
I appreciate your help diagnosing the problem. I’ve built around 10 pedals so far, and only one has been a complete disaster. But, clearly, I’m still learning the ropes. Oh, and I’m building your Altura right now. So far so good!
-GradyToday, the voltage remained steady at 4.98 on pin 23 while I turned the Depth knob. I grounded to to the chassis with an alligator clip to eliminate (or at least reduce!) the chance of error while I had the probe on the pin and turned the Depth knob. As before, the only change was that the Rate LED would start blinking at spots from 10:00 to 2:00 on the depth control.
The only other observation I can offer is that if the probe slipped between pins 27-28 or 28-1, the Bypass LED illuminated.
– Grady
The microcontroller is seated properly. I get 4.97 at pin 23. And I get 0 to 4.98 on the middle lug of the Depth pot.
So, I probably don’t have enough solder somewhere, or an errant blob somewhere! Since there is this apparent crosstalk between the Depth knob and the green Rate LED, can you give me a good starting point to look for solder errors? Or, can I use the DMM to track down the cause of the intermittent signal?Uh oh – I may have the same problem. Everything went great with the build 🙂 However, when I tested with an amp, I noticed the green LED stayed fully lit regardless of any settings, and I was not getting any tremolo effect. After fooling around with all the controls, I noticed a correlation between the Depth control and the green LED. I could get everything working only when the Depth control was between approximately 10:00 and 2:00. The signal still drops out through that range, but re-engages with some small Depth knob wiggles. And when it’s working, all of the other knobs and toggles operate as expected.
I reflowed the solder to the Depth pot, adjusted the paper barrier, and made sure the ground wire from the tab to the board was in good shape.
My unit is ZD3773, and it has the MIDI option (which I have not properly tested, yet).
Do you think it’s the microcontroller? (I’m also on a Mac, so re-flashing doesn’t appear to be an option.)
Thanks!
Grady
