Can you use magnetic/reed switches for the application?  What problem
are you trying to solve by isolating the switches from the circuit and
each other?

-Adam

Wouter van Ooijen wrote:

>I want so sense the state (open/closed) of a number of switches. The
>switches must be isolated from my circuit and from each other. Thers is
>as yet no power available with each switch. One way would be to include
>a small DC/DC converter and optocoupler for each switch, but this feels
>like overkill. Another way might be to use a small transformer (as used
>in a modem) with the switch at one side and measuring the inductance on
>the other side. Any experience with this method? Other suggestions?
>
>Wouter van Ooijen
>
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