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#21
March 11th 07, 04:06 AM
posted to rec.radio.amateur.homebrew,sci.electronics.design
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Detecting Ultrasound
On 2007-03-10, John Smith I wrote:
John Smith I wrote: wrote: ... Do you really want to hear it, or have a "field strength indicator"/locater? Why not just a mike capable of "hearing" the ultrasonic freqs in question--feeding an opamp and meter? Pointing the mike around should lead you into the correct direction and following the meter reading should lead you to the source(s). Possibly can substitute a light or even a led in series with a pot and use a visual indication of strength ... JS Come to think of it, wouldn't take much more to square up the sine wave out of the opam and drop a cmos decade-divider onto that output of the opamp and feed an ear phone with the dividers output--30,000 becomes 3,000 hz--easily "hear-able!" only if theres no other sound present in the mic signal. and it will give no indication of signal amplitude. |
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