Jonathan,
That is a great discovery. Yes, if U5 was getting hot it would be
dragging down the 5 volt supply and causing U1 to not function.
73,
Don W3FPR
On 1/4/2020 12:18 PM, Jonathan Taylor, K1RFD wrote:
Don,
Z1 is resonating away, but in the course of verifying that, I noticed
that the U5 op-amp was getting hot to the touch. I replaced it, and
now all is working normally. Perhaps it was loading down the 5V
supply excessively.
I'm guessing that U5 made the ultimate sacrifice in the same incident
that zapped D1 and D2 some years ago. Apparently this has happened
before, because I see that I had installed an 8-pin DIP socket for it
:)
Thanks again for your help!
73
Jonathan K1RFD
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