bedouin
Well-Known Member
I'm not aware of one - but what you are looking to achieve can be done very simply with a resistor and a zener diode.
If you wire a 3.6V (ish) Zener in parallel with the LED, and put a 420R resistor in series with the pair that should work fine (actual figures depend on the characteristics of the diode). Those components will only cost about 10p
I'm told that there was an article in PBO a couple of months ago about doing a similar thing with a torch bulb - that didn't need the zener because the supply was a fixed voltage.
If I were trying to do this I would probably wire 2 LEDs in series, and adjust the components to suit.
NB this is all theory - it's so simple it should work but I haven't tried it.
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If you wire a 3.6V (ish) Zener in parallel with the LED, and put a 420R resistor in series with the pair that should work fine (actual figures depend on the characteristics of the diode). Those components will only cost about 10p
I'm told that there was an article in PBO a couple of months ago about doing a similar thing with a torch bulb - that didn't need the zener because the supply was a fixed voltage.
If I were trying to do this I would probably wire 2 LEDs in series, and adjust the components to suit.
NB this is all theory - it's so simple it should work but I haven't tried it.
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