The caveat is that the op-amps need 1K pull-up resistors from their outputs at U1 and U4 to the positive rail to ensure it will always start up.
What to do when random flickering lights reveal glitches galore? The solution: scope both phases of AC line.
Will throwing some capacitance across a 240V AC line absorb the interfering audio-band line noise from the heat pump? Maybe.
A DC transformer design sent by an EDN reader has piqued not only interest, thought and deliberations but possibilities, too.
Are there items in your toolbox or lab that have been your constant and faithful companions through the years? Here are a few of mine.