ultrasonic speaker simple amplifier

Hi

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.


.

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