Friday after pulling out the HFB ][ built the night before, I could not get it
to work with my Nano Keyer project. But despair not, as I found the solution…
I replaced the optocoupler 4N43 with a MCT6, and now it works! The N43 did not
cause any issues with my KX3, but apparently the forward voltage drop was a bit
too much for the HFB ][.
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