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40 Khz Square Wave Amplifier

rohan kapoor
Prodigy 10 points
Other Parts Discussed in Thread: LM324, DRV8800

I am using a 40 Khz square wave from a micro controller to my ultrasonic transmitter to measure distance from the receiver. However, I needed to increase the range of my system from my present value of approx. 1.5 m. For that, I was trying to amplify the 3.6 V ( with 0V baseline) square wave given to the transmitter. I tried using first, a  LM324 amplifier circuit and then another NPN transistor amplifier circuit, but in vain. Could anyone suggest some circuit for the same as I was not an expert in electronics, so was finding it hard to do so?

  • 0
    TI__Guru 63510 points

    Rohan,

    It is not enough to say that LM324 did not work in your application and expect some sort of assistance.  You need to provide the details like: circuit schematic, supply voltages, gains, and explain what exactly did not work as expected?  Otherwise, we have no means of helping you since we don't know what the problem is.

    Having said that, check if you do not violate an input common-mode voltage range (0V to Vcc-2V) or the output voltage range (20mV to Vcc-4V) for single supply application - see the PDS table below.

  • 0
    TI__Guru 62825 points

    Hi Rohan,

    Since you're trying to amplify a digital signal to drive an inductive type load (transducer) I would suggest using an H-Bridge type circuit opposed to a linear amplifier.

    Try the DRV8800 from TI or a simpler older part like the L298N.

    Regards,
    Collin Wells
    Precision Analog
    Linear Applications