Whoa! did I step in it, or what!

A big thank you to Georg Hager and Thomas McGahee who
pointed out that you don't need a series resistor if you have a
feedback emittor resistor. They both mailed me privately, but
I think it is usefull info for most PIClisters, so here it is :

>                         _ Positive
>                         |
>                         |
>                        _|_
>                        \ /  IR LED Imax=4.3/Re
>                         V
>                        ---
>                         |
>                         |
>                         |
>                         |
>                       |/c
> PIC-------------------|     NPN
>                       |\e
>                         |
>                         |
>                         /  Re
>                         \ 47 ohm   Re=4.3/Imax
>                         /
>                         \
>                         /
>                         |
>                         |
>                       -----
>                        ---
>                         -

The base current 'sees' a series resistor of Tgain*Re anyway,so adding a series resistor is bit sit
silly, really. I can't beleive
I stepped into *that* one!

Thanks, guys.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za

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