Re: 40KHz Oscillator Doesn't


Phil Cross wrote:


I then connected the 40KHz transducer in parallel with the 4.7M
resistor,

There's your problem. The op-amp has a very high input impedance, and
the resonator has a low impedance and lots of stray capacitance. Try
putting a 47K resistor from input to ground so the resonator works into
a more reasonable impedance.

Also you may not be getting the phase-shift you expect. You may have
to a dd a RC phase shift network to get the phase right.

.

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