Re: Optoisolation for a modem

Doug,
My favorite protector is a two pole knife switch and two 1/4 amp fuses
followed by two 150V mov's to ground. A pair of picosec transient
voltage suppresion diodes would be a good addition too. Digikey p/n
P6KE150CACT-ND at a $1.08 ea will do nicely. I have seen them in action.
Saved my system from a very close strike. Must be used in conjuction
with fuses. Rich Dean


"Harrison, Doug" wrote:

>
> From: "Harrison, Doug" <dharrison@...>
>
> Does anyone know of a good way to protect a modem from spikes on the phone
> line? The Triplite surge protector works once, then the next jolt cooks the
> modem. We went through three modems and a fax machine last year. Bear in
> mind that we almost always unplug the modem after each use. It's those rare
> "almost's" that cause the problem.
>
> Our power is relatively surge free, probably because we have MOV's on three
> circuit panels and three wall outlets. Haven't blown one of these yet. The
> Triplite phone line protectors are just too expensive to replace as often as
> they go bad here. And they only get the first blast. The modem gets the
> rest.
>
> We live on a lake, so lightning is a problem. Any suggestions, such as
> optoisolation?
>
> Doug
>
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