Anyone have any idea to design an ultrasonic transceiver or where i can find the free sample about this circuit. Thanks a lot!!!
- posted
19 years ago
Design an ultrasonic transceiver
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- posted
19 years ago
I did one once for a client. Instead of running AM modulation (as usual) and avoiding the resonance peak, I ran FM *inside* the resonance peak. Decoded with a couple stages of op-amp and a PLL. Worked great for nearly a mile on nive volt batteries.
-- Luhan Monat (luhanis \'at\' yahoo \'dot\' com) "The future is not what it used to be..." http://members.cox.net/berniekm
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- posted
19 years ago
if you mean driving a single ultrasonic transducer, which is also used for receiving,
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has some reference designs on how to hookup one up to various microprocessors.
If you're asking about a bi-directional communication link. Then AM or Phase/FM modulation can be used to modulate the 40KHz carrier and then a detector to demodulate it. Transceiving analog (i.e. where the modulating waveform is analog) is a bit harder than digital, which can be done with on/off keying, frequency shift, phase shift, pulse position or pulse width modulation. You should be able to adapt IR remote control circuits for this, since they also operate around 40KHz.
Later, -ingo
-- /* Ingo Cyliax, cyliax@ezcomm.com, Tel: 812-391-0895 */