piclist 2000\12\06\115923a >
Thread: Reducing shutdown power in RC Oscillator mode
www.piclist.com/techref/microchip/time.htm?key=oscillator
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face BY : Dan Michaels email (remove spam text)



Mike Harrison wrote:
.........
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Hi Mike, Russell,

Actually, I have run piezos over a very wide frequency range
off a squarewave from PIC - from say 100 up to 6000 hz. They
may be tuned to a specific frequency, but do give usable
outputs over many. I use a 100-1000 ohm R in series to keep
the volume low enough so's I can stay in the same room with
the @#$%^&* squeeeeeeling.

My device counts pulses to 50 Mhz on an input line and outputs
pulses to the piezo at a rate logarithmically proportional to
the input. Works great. Following is the table I use:

Freq-in                 Piezo pulsefreq
=======                 ===============
1 hz - 10 Khz           100 hz
10 - 20 Khz             200 hz
20 - 40 Khz             500 hz
40 - 80 Khz             750 hz
80 - 160 Khz            1000 hz
160 - 320 Khz           1500 hz
320 - 700 Khz           3000 hz
700 Khz - 50 Mhz        6000 hz

Note, just for fun, I also modulate the same output signal
at 1 - 12 hz, so I can drive an LED for visual indications
off the same pin as the piezo.

- Dan Michaels
Oricom Technologies
http://www.oricomtech.com
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