On Wed, Nov 6, 2024 at 5:21 PM dwight <dkel...@hotmail.com> wrote: > > I'd think a diode, white LED and a resistor would make a good enough strobe. > Maybe 2 resistors to isolate the AC lines enough a little better.
Quite likely. Actually the traditional mains lamp stroboscope flashes twice per cycle, so you might want 2 white LEDs in inverse parallel. I wanted something that I could run off a DC supply and which could handle '60Hz' markings in the UK. I have at least one device with a set of black and white bars for 60Hz mains but not for 50Hz. Another advantage is the fact that the LEDs are only on for 1/16th of the time gives a very clear pattern. The bars look sharp and you can easily see if they are jitterng about due to bad bearings, drive belt issues, etc. -tony
