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From: Frank Buss on 1 Jun 2010 00:28
Royston Vasey wrote:

> I've used that circuit as well.
>
> How much better do you think it is to add a resistor, say 180R, between the
> junction of the two diodes and the CPU pin to further limit the drag on the
> input pin?

I'm not an expert for analog things, maybe Joerg knows it. But you could
simulate it with LTspice.

--
Frank Buss, fb(a)frank-buss.de
http://www.frank-buss.de, http://www.it4-systems.de
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