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Interference when connecting a piezo tweeter

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gmarocco

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I am building an ultrasonic generator with a dual frequency (25kHz and 36kHz). When the tweeter is not connected, the circuit works fine. When I connect the tweeter at the H-Bridge, I notice that that the frequency generated by U6 (NE555) has moved to 70kHz. Moreover, the square wave generated by U8 (NE555) has no more a period of 3s but of 0.1s. Should I connect an inductance at one side of the tweeter? Which is a suitable value?

The tweeter I have tried to connect is the following: **broken link removed**

ThanksView attachment ultrasound generation.pdf
 

My guess is that you are pulling your power supply down. You might be getting some shoot-through in your bridge.
 
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