Re: ultrasonic speaker simple amplifier

On Wed, 30 May 2007 14:03:25 -0700, Infundibulum wrote:

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.

Why do you want power at 20 KHz? Dog whistle? Sonic weapon? Phlogistonic
levitation?

If it's to annoy dogs, please don't do it. It's not right to punish a dog
for the negligence of its owners. If it's barking, use a water spray to
shut it up.

Thanks,
Rich

.

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