[sdiy] LED current source needed for 'digital' outputs?

Justin Owen juzowen at gmail.com
Sat Mar 1 13:45:24 CET 2014


Hello, just a little double-check here...

For an LED displaying a changing or AC signal I would always use some sort of transistor current source.

For an LED displaying a simple on/off digital signal - e.g. a logic output - is there any reason to not just use: Source > LED > R > GND?

This is a circuit being used in a modular environment so it will need to play nice with its neighbours and optimal/'reasonably' low current draw is a normal priority.

Thanks,

- J




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