[sdiy] Op Amp LED driver / Current Source problem/solution

[Neil Johnson]

Hi Michael,

>> Umm, the problem with that circuit is that the input also supplies the
>> LED current, so you are loading the signal you are monitoring.  Not so
>> good for LEDs that take lots of mA.
>
> sorry, I got confused: I would have seen it as putting additional load on the source to be monitored.
> What's not so good for the LED?

Sorry, my lazy English!  I mean that the circuit approach is not so
good if you're using LEDs that take lots of mA because the source has
to provide that current.

Cheers,
Neil
--
http://www.njohnson.co.uk