Messages

...well, I spoke too soon. I was able to solve my issue with the range switch only working in one position. As it turns out, I had wrongly assumed that the white dot on my vactrols indicated the cathode of the LED. The dot in fact indicated the anode (+) side. I verified this by lighting the led with a battery/CLR while measuring the resistance of the vactrol.

I feel like a dummy for having put the vactrols in wrong polarity on both builds. I desoldered them and put them in the right way, and now everything works great. Hopefully this helps prevent someone else from making the same mistake.

I just built two of these today, and am having the same issue with the "range" switch on both of mine. I am hoping someone solves this one soon!

BlearyEyes, you make a good point - I should have mentioned that I changed the charge pump chip also, and it did not cure the problem. It was definitely the regulator. I noticed a few posts where folks described a similar issue, but then the post would gravitate toward solving the heterodyne issue.

I wanted to record this issue so that other searchers would have something else to check!