Signal Presence Detectors?

[Martin Czech]

:::I don't think the optocoupler will help... if you can light the LED in the
:::optocoupler
:::without interference, you can light a visible LED as easily....

Now you got me. That was really stupid. But some kind of
dielectrical isolation might be usefull here and there,
especially when driving large loads. So if Don wanted to drive
a 1 kW bulb from his audio channel, I guess this would be the way to go ;->>




m.c.