HI all...I have a few quick simple questions for the group...

I have a transformer with 4 leads on the AC side and 6 on the output side. =
 I'm a bit confused...I'm used to 2 on the input side and 3 on the output. =
 Any idea how to even test the transformer?  I tried measuring the =
ohms....they are all very close....

Another transformer I have is 110 to 16 volt...I hooked it up backward to =
see if I could get a few hundred volts AC...nope...it popped my circuit =
breaker....why did it not act as a step up?  Do I need to limit the =
current I feed it?

And hearing Ultrasonic.  I want to audibly hear the output of a ultrasonic =
transmitter....can I build an amp that shifts the frequence down to a =
level I can hear via a speaker?  Any ideas?

Thanks for hearing me out...I know these are newbie questions....

Thanks,
Tim

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