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Permalink Reply by Manny Lopez on February 13, 2014 at 8:45am

Thanks Richey. Both of my attempts worked.

I suppose a little more information would help.

My first one I had would and notice wire slipped off the end. So taking some advice I epoxied a tiny card stock strip along the end. This allowed me wind my first coil. It was 2k roughly. 2000 winds of 42ga wire and had trouble keeping wires still. MY BIG MISTAKE was using tiny dabs of epoxy. Reason being, is that once I tested that the coil was complete and picked up sound, I coated the winds in epoxy. If it had not been for this, breaking a lead would have been no issue. The problem was that the leads soldered to the pickup wire weren't as compliant and ripped themselves free from too much tinkering.

The second, I learned from the first. Epoxy only to hold the end pieces of card stock on the bobbin. I used clear packing tape on it to wrap once it was complete to protect the coil, and keep the leads firmly attacked. This one actually measures 1.9k instead of 2k, but don't think that's an issue. I hooked it directly to the output jack and plugged it in. It works. It hums. But using my lm386 amp, I've not got a lot of headroom to really hear the pickup, it's faint. Perhaps this low volume is part of the design.... It's micro phonic and would benefit from a potting (my winding to blame), but now believe the tape that I used between the bobbin and the joint where the coils meet, will fall off while potting, and am concerned about removing it myself as it will likely damage coils or remove insulation.

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