Re: Optoisolation for a modem

> From: "Harrison, Doug" <dharrison@...>
>
> Does anyone know of a good way to protect a modem from spikes on the phone
> line?

10 ohm carbon COMPOSITION resistors in series with the tip and ring and
followed by a 170 volt MOV, about quarter sized, across tip and ring.
This combination can take multiple FCC part 15 test strikes.

Of course, finding carbon comps may require a search of surplus stores,
I think everything nowadays is carbon film or metal film.

Jim Eckman