1Mhz Piezo Drive Circuit

[CoralSea]

I have several 1Mhz Piezo transducers of different sizes. I want to take some measurements of these piezos by varying the frequency slightly. I generate a nice clean 1Mhz square wave digitaly. The problem is the signal is dying at the base of the transistor when I connect the transformer. Maybe the signal is returning?? And R2 is getting very hot. Just looking for some suggestions, ideas, help? Thanks

EDIT: Forgot to add - the transistor is a BU406.

 

[FvM]

Presume the generator impedance is considerably higher than 2.2 ohm, large Ccb of BU406 will load the input respectively.

But there's surely some output voltage swing?

R2 will dissipate some power by design, don't know how you arrived at the shown component values. Some parameters like transformer ratio and inductances are also unknown.

 

[CoralSea]

Presume the generator impedance is considerably higher than 2.2 ohm, large Ccb of BU406 will load the input respectively.

But there's surely some output voltage swing?

R2 will dissipate some power by design, don't know how you arrived at the shown component values. Some parameters like transformer ratio and inductances are also unknown.

Thanks for your time to reply!

- The 2.2ohm is from a circuit that used a Mosfet gate driver. I'l see what happens without it.

- No voltage swing.

- The component values are from another engineer who suggested them to us.

- Forgot to add the transformer is a mini-trafo with a 1:10 ratio. Don't know about inductance values.

 

[FvM]

No voltage swing.

Don't see how this can be possible. Something's wrong with your circuit wiring.

Or may be the supply is collapsing.