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What is an ultrasonic amplifier?
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.
What is audio frequency amplifier?
Audio frequency amplifiers are used to amplify signals in the range of human hearing that approximately 20 Hz to 20 kHz. These Audio power amplifiers are used to receive the amplified input from a series of voltage amplifiers and then provide sufficient power to drive loudspeakers.
How does a piezoelectric ultrasonic transducer work?
The principle of this sensor is simple: A disc made from piezoelectric PZT material, vibrates under a certain tension applied and generates ultrasonic waves out of the emitter. When those waves meet an object, they come back to the receptor sensor.
How do you drive ultrasonic transducers?
The simplest way to drive a 40 kHz transducer is to connect it to the output (pin3) of a 555 connected as multivibrator at 40 kHz. To see the best function,use another 40 kHz transducer connected to oscilloscope input (1 Ohm, 50 pf).
Which is the best ultrasonic amplifier for piezoelectric speakers?
For example, a piezoelectric speaker needs an 50Vpp sine-wave, but a signal generator output is 5V maximum. Using the TS250 to amplify the signal source and it outputs high voltage and high current ultrasonic waveform that drives the piezo speaker. In summary the TS250 is an ideal ultrasonic amplifier driver.
How is a piezo amplifier used in a generator?
To achieve 40V square-wave, a piezo amplifier driver is used to boost the generator signal and outputs high voltage and high current to drive the piezoelectric actuator. Figure 3 shows an example of a piezoelectric transducer driver.
How does an ultrasonic piezoelectric transducer work?
The ultrasonic piezoelectric transducer works on the principle of the converse piezoelectric effect. In this effect when electricity is applied to a piezoelectric material, it undergoes physical deformations proportional to applied charge.
What is the operating voltage range of a piezo transducer?
The piezo driver must be able to output such high current, high voltage, and high frequency at the same time. Higher frequency requires even more current. As discussed above, the piezo transducer device’s operating voltage range can be anywhere from 10V to 200V or more.