Jan 30, 2016  Building driving circuit for ultrasonic transducer - 100khz 60W. I would advise you to use a transformer and a push-pull amplifier FET. #4 Like Reply. Ultrasonic transducer driver circuit for ultrasonic cleaner Posted by mailgirishs in forum: General Electronics Chat. Ultrasonic amplifier is a lab equipment that amplifies voltage signal at high frequencies. Unlike audio frequencies which are between 20Hz and 20kHz, ultrasonic-frequency are greater than 20kHz and into the hundreds kilo-Hertz and even MHz.Common ultrasonic amplifier applications are piezo transducer and sensor.

Ultrasonic transducer driver circuit ultrasonic transducer driver circuit on ultrasonic cleaning workpiece, the ultrasonic generator PCB are allowing the particles attached to the workpiece, oil and other mechanical vibration with the ultrasound off or dissolved or emulsified and so on, to achieve the purpose of cleaning the workpiece. Ultrasonic Cleaning Equipment Ultrasonic parts of divided into two parts; one ultrasonic transducer, said ultrasonic vibration (or head); the other is the ultrasonic generator, ultrasonic transducer is the ultrasonic generator is converted to electrical signals provided by the mechanical vibration.

Ultrasonic transducer driver circuit.

It all depends on how you want to drive the transducer i.e. The application: - It appears that you can drive at resonance or anti-resonance which indeed does make it pretty similar to how you would use a crystal in an oscillator.

The graph above is taken from interesting website. I can't determine from your question what application you have but, from the (in the other question) to the type of transducers you use it seems you will be series resonating the transducer and this means it has low impedance at resonance due to L and C being in series. This means that the type of control circuit will look like this: - Taken from and this site also has some very useful information and an ebay link to a cheap one: - But, if you are still intent on building your own you can use the series resistance method to generate a feedback signal to the front-end of a power amplifier.

Clearly the series resistance need only be about 1 ohm to prevent excessive power losses. The signal will be maximum at series resonance and importantly in-phase with the drive voltage to the transducer. This means a simple power amp will do the job but, with a method of controlling amplitude. Amplitude needs to be controlled or the PA will go into saturation and it may damage the transducer. It's a bit like a Wein-bridge oscillator needing amplitude control to ensure sinewave purity. The fed back signal could be adjusted with a pot but, given the Q of the transducer, this is probably best achieved using a JFET: - Regards the PA itself, make sure that the phase angle between output and input is small at resonance or the transducer will not run quite at perfect resonance.

This is usually done by ensuring the PA has at least 10x the bandwidth of the running frequency. An idea once I had, but never tried, is to treat an ultrasonic transducer like a high-power crystal oscillator.

Your typical crystal oscillator circuit looks like this: – Schematic created using Simplistically, the crystal (along with the 2 capacitors) provides a 180 degree phase shift at its resonant frequency and this determines the output frequency of the oscillator. So why not try something similar with your transducer?

You would of course need to use something significantly more powerful than a little logic inverter, and you would probably need an additional band-pass filter to make sure you don't end up with one of the transducer's harmonics, but I imagine it would look something like this: You may need to introduce some method of kick-starting it if there isn't enough 'natural' noise in the system to get it going, and the filter may need to have some gain to compensate for the low voltage across the sense resistor. It seems you aren't the first person to have this problem. Have thought about it and patented a solution.