Re: Re: Re: Optoisolation for a modem

So the impedance of the resistors is adequate, with the strike shorted to
ground, to limit the voltage and protect the parts, adn you DON'T want them
to open up like fuses! My mistake. Instead of the hard to find carbon
comp, you could also use a 2 to 5 watt wire wound... the inductance might
have some (positive?) effect on the surge suppression though...

Jim


James wrote

>in this application carbon comps
> have a tendency to stay together and will pass dozens of simulated part
> 15 lightning strikes. It will also pass at least a couple of real ones.
> Carbon films have a tendency to arc over and open up. Nothing wrong with
> that so long as you don't mind replacing them.