Does anyone have a schematic (or link to one) of a circuit that will convert very low (below human audio) and very high (above human audio) to somewhere in the 20Hz to 20kHz range? Even if there are 2 schematics (one for low and one for high) it would be helpful. Thanks.
-- What frequencies and ranges are you talking about?
I'm not sure. I thought it would be interesting to hear how many sub and super sonic sounds are around us. Anything above or below normal hearing range is good.
Google for "bat detector". Those convert bat ultrasonics to the audio range.
THe Stand by diode ring modulator! :)))
or LM1496 chip will also do it ...
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5
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