LEDs in series and forward voltages.

Well, i would be very pleased to have someone of you point me in the right direction :slight_smile:

try this:-

^^^

Ha-ha, oh wow.

Oh wow, indeed.

I remembered there was an easy way to build one (I know they're not that expensive, but I like to build stuff myself...)

The one I use is with the LM317L (TO92 size) and a resistor: A value of 68R will give you 18mA, 100R for 12mA. Good from 5mA to 100mA.

Hmmm… some interesting ideas, but I think I’ll re-design my LED arrays to have 3 in series with a resistor to limit the current. Many thanks for everyones help with this.