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flat5 · 03-25-2006, 01:13 PM

A one watt 30khz oscillator outputting maybe 700 millawatts into a tweeter won't drain a car battery. Even better would be a pulsed osc. The duty cycle would be much less - saving battery power.

Might be too much power. I really have no idea. It should be fun to build if you like that sort of thing. If not, you may know someone who does :-)

I'm thinking a dual 555 timer - one for ultra sonic osc. one for pulsing it(turning it on & off).
A driver transistor following the osc. to an ultrasonic transducer.

03-25-2006, 01:13 PM	#19 (permalink)
flat5 Very Insignificant Pawn Location: Amsterdam, NL	A one watt 30khz oscillator outputting maybe 700 millawatts into a tweeter won't drain a car battery. Even better would be a pulsed osc. The duty cycle would be much less - saving battery power. Might be too much power. I really have no idea. It should be fun to build if you like that sort of thing. If not, you may know someone who does :-) I'm thinking a dual 555 timer - one for ultra sonic osc. one for pulsing it(turning it on & off). A driver transistor following the osc. to an ultrasonic transducer. Last edited by flat5; 03-25-2006 at 01:40 PM..