I keep an oldskool fluorescent desk lamp around for that reason; also makes a handy desk lamp ;-)
On Wed, Nov 6, 2024 at 12:59 PM Tony Duell <ard.p850...@gmail.com> wrote: > 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 >
