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RE: LED at 60 HZ? (was RE: Radio Shack Strobes)
Original poster: "Philip Chalk" <phil-at-apsecurity-dot-com.au>
Malcolm - & Dr. Resonance,
> Snip <
> Anyone here tried wiring an LED straight off the mains with
> a capacitor <in series> chosen for its reactance at 50 or 60 hz?
Not a good idea. The non-conducting half cycle will apply a damaging
reverse voltage across the LED.
It does work, I've done it, the LED is happy provided you parallel it
with an ordinary diode connected A-K & K-A with the LED. That diode
then conducts the reverse current (10-20mA or so) around the LED on
alternate half-cycles. Use at least a 400V diode (1N4004) on 240V
mains, better to use like a 1N4007 for long-term peace of mind.