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Building a Variable Voltage Supply

I am building a variable sinusoidal power supply in which, we should be able to vary frequency from 10Hz to 100Hz and output from 100Vpp to 300Vpp. However power requirement is very low, about 300mW. Available Input voltage is 12V DC. Can you please share with me some reference design. Thanks.

  • Hello Priyankar,

    The 100 V to 300 V output requirement places the operation well beyond the operating voltage levels of our Precision Amplifiers products. Likely, you will have to use high-voltage transistors external to lower voltage analog integrated circuits to handle the high-voltage output.

    Here is an example of a circuit employing high-voltage MOSFETs:

    http://electronicdesign.com/components/1-kv-piezo-amplifier-keeps-cost-noise-low

    This design could be scaled for 300 V operation. It could be driven by an IC designed for waveform generation such as the 8038. It provides a sine output whose frequency is easily controlled by a potentiometer. Here is information on waveform generation that includes a single-supply, 8038 circuit:

    http://www.electronics-tutorials.ws/waveforms/waveforms.html

    I hope this gets you off to a start.

    Regards, Thomas

    PA - Linear Applications Engineering