Advice for improving a Ultrasonic Dog Bark Stopper

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Thanks colin for muddying the water by posting a generic circuit that has no relevance to the posters request for an amplifier capable of 100watts that could run from his existing bark stopper.
 
Yeah, pyro but don't need to throw gas on a fire =>
Ya but Colin's circuit is neat, I saved it under 555 timer stuff. I never seen a push pull 555 before. Andy
 
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