The Ultrasonic transmitter (transducer) is effectively a capacitor and when you supply a voltage in one direction, it gets charged.
You must now supply a voltage in the opposite direction to fully discharge it and charge it in the opposite direction. This is how you will get the greatest output. If you drive it with a transistor, you need a resistor across the device to discharge it. That's why push-pull is the best method.
You must now supply a voltage in the opposite direction to fully discharge it and charge it in the opposite direction. This is how you will get the greatest output. If you drive it with a transistor, you need a resistor across the device to discharge it. That's why push-pull is the best method.
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