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From: Jamie on 17 Feb 2010 19:10
pimpom wrote:

> I've come across this DIY IR remote on-off switch design more
> than once with only minor variations.
> http://img109.imageshack.us/img109/6399/irswitch.png
>
> It looked OK at first, but then it seemed to me that R3 and D1
> are not really needed. Why not just omit R3 and short out D1 as
> on the right side of image?
>
> And is such heavy filtering necessary? I'd think 38kHz pulses
> fired in ~1kHz bursts would be adequately filtered with a much
> lower RC combination and will have faster response too.
>
>
Lets see, Diode to prevent the 100K from draining the REF down
faster than the 1M that is there.

Resistor to remove the in rush currents on the pulse from the
transistor? Which also may lead to parasitic abnormalities.

Just my guess.




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