A Circuuit to Drive Ultrasonic Transducers
A Circuuit to Drive Ultrasonic Transducers
(OP)
I am looking for an oscillator circuit to drive ultransonic transducers, which are going into a processing type of device. This works like an ultrasonic cleaner unit. ( about 40kHz 1000v 400 W) it would be nice to adjust the frequency and power.





RE: A Circuuit to Drive Ultrasonic Transducers
<nbucska@pcperipherals.com>
RE: A Circuuit to Drive Ultrasonic Transducers
RE: A Circuuit to Drive Ultrasonic Transducers
or <www.cleanosonic.com>
<nbucska@pcperipherals.com>
RE: A Circuuit to Drive Ultrasonic Transducers
RE: A Circuuit to Drive Ultrasonic Transducers
<nbucska@pcperipherals.com>
RE: A Circuuit to Drive Ultrasonic Transducers
RE: A Circuuit to Drive Ultrasonic Transducers
Can the transducer provide enough energy so far off from resonance?
<nbucska@pcperipherals.com>
RE: A Circuuit to Drive Ultrasonic Transducers
RE: A Circuuit to Drive Ultrasonic Transducers
<gmartens@telusplanet.net>
RE: A Circuuit to Drive Ultrasonic Transducers
Reference: Marcus J., "Electronic Circuits Manual", McGraw-Hill Book Company
RE: A Circuuit to Drive Ultrasonic Transducers
I have had a quick look through my records but can not readily lay my hands on it. I will look again in the next few days.
Your application sounds like an industrial one in which case I think you should buy proven industrial generators. If you are going to use a bank of generators operating at different frequencies, then I can understand that you will have difficulty obtaining the frequencies you want from manufacturers because they will all work at their design frequency
However if you are short of cash and wanting to develop the circuitry yourself you are in for a lot of work depending on your resources. There a lot more aspects to this apart from making the oscillator.
RE: A Circuuit to Drive Ultrasonic Transducers
Having worked with magnetostrictive transducers and having been frustrated with trying to find reasonable power supplies available off the shelf, I'm designing my own. These comments will apply equally well to a piezo device.
I've chosen an LM555 timer running in astable mode. The output waveform looks more triangular than sinusoidal but the ultrasonic transducer I'm going to drive at resonance will round that off and make it sinusoidal. The LM555 feeds a matched NPN-PNP pair of BJTs that provide the necessary current gain. This output stage is a typical audio amplifier architecture. The customization comes in matching impedances to the unique transducer characteristics.
Charlie
contact@bright-engineering.com
RE: A Circuuit to Drive Ultrasonic Transducers
A simple and inexpensive solution would be to program a microcontroller to provide the frequencies you require.
Cheers,
G
RE: A Circuuit to Drive Ultrasonic Transducers
The sawtooth /\/\/\/\ can be clipped/filtered to get a
rounded /-\_/-\ allmost sinewave with minimum harmonic
content !
<nbucska@pcperipherals.com>
RE: A Circuuit to Drive Ultrasonic Transducers
Ahh, but I'm cheap! The ultrasonic magnetostrictive transducer itself is my filter. Any harmonics that survive eddy current attenuation will then be severely attenuated because the transducer is driving a waveguide with a non-linear shape, which the math tells me will only resonate at its fundamental frequency.
Also, I changed the electrical design to a single high-powered BJT for gain.
Charlie