Thanks for the help...I'll go google this "heterodyne" thing and see how =
it works...:)

>>> rixy@VVALLEY.COM 11/11/03 03:38PM >>>
Like I said, it's just like an AM radio. Same principle. The same =
principle with receiving morse code in the amateur radio bands. A =
transmitter sending code on 7040 khz can be heard as a 1 khz on/off tone =
if your receiver is tuned to 7041 khz. The term is hetrodyne.
Rick

Tim Hart wrote:

> I found some "Bat Detector" circuits that seem to be exactly what I'm =
wanting to do.  I'm still lost as to why a local signal mixed with an =
ultrahigh signal makes something you can hear?
>
> They are used an LMC567 "Phase Locked Loop IC" to make the local =
oscillations.  Which is Greek to me...  I've used the LM386 before so I'm =
cool with that...but the rest still doesn't make much sense.
>
> Maybe you can make sense of it...
> http://www.njsas.org/projects/bat_detector/populel_sch.html=20
>
> I appreciate the help!!!
> Tim

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