Hi everyone. I'm probably overthinking this but I am wanting to implement a pulse excitation of a 400PT160 ultrasonic transducer simply by using a I/O pin on a PIC microelectronic which is configured to output a 12.5us 3V3 pulse. The voltage will be amplifed using an IRLZ44 logic level gate drive MOSFET.
I would connect the I/O to the gate via a 100ohm series resistor (if needed). The source will be connected to ground and the transducer connected between 12V and the drain of the FET. I think this should mean that when the FET is off the voltage drop across the transducer will be 0V as both sides will be 12V. Then when the FET is on the voltage drop across the transducer will be effectively 12V as the Rds(on) is about 0.05ohm and the transducer impedance is 1Kohm.
Will this work or am I missing something? It seems much simpler than other excitation circuits I have seen but I can't see why this wouldn't work.
I would connect the I/O to the gate via a 100ohm series resistor (if needed). The source will be connected to ground and the transducer connected between 12V and the drain of the FET. I think this should mean that when the FET is off the voltage drop across the transducer will be 0V as both sides will be 12V. Then when the FET is on the voltage drop across the transducer will be effectively 12V as the Rds(on) is about 0.05ohm and the transducer impedance is 1Kohm.
Will this work or am I missing something? It seems much simpler than other excitation circuits I have seen but I can't see why this wouldn't work.