> I have a farm type electric fence power supply that we use to keep 
> critters (deer, raccoons, etc.) out of our vegetable garden. It is 120 
> VAC 10 watt max input, and output is 440 - 660 VAC measured
> with a DMM

Isn't that really dangerous ? An electric fence is normally, IME, a
pulsed affair, not constant high voltage. Do you hear any interference,
like clicking, on an AM radio for example ?

If it interests you, I have a commercial "hot fence" indicator. It's based
on a 74HC04, powered by a coin cell. You hang it on the fence. There
is no electrical contact. The HV pulse triggers the 74HC04 to blink a
LED

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