Eric T. wrote:
> The 100 ohm resistor and the .1 microfarad capacitor provides transient 
> protectin.
>  If more is needed it can be added easily.

Yes...and it will be needed.

I used to make circuits that used a 555, supposed 
to be good to 20V, a good many of them failed due 
to not enough protection.

It takes more than you might think to ensure 
reliability. -Ken

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