isolated DAC. PWM ( 20khz ) to analog 0-10Volt

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Thread: isolated DAC. PWM ( 20khz ) to analog 0-10Volt

  1. #1
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    Default isolated DAC. PWM ( 20khz ) to analog 0-10Volt

    I have found this shematics .

    For R6 and R7 i have put 33kohm resisitors and i get 2.5 Volt output when there is no signal.

    Anyone knows calculation for this circuit?

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    Default Re: isolated DAC. PWM ( 20khz ) to analog 0-10Volt

    What you want is when there is no input, the output is zero.
    The 1st amp is an inverting amp. so then there is no input, the - input is pulled high, making the output low.

    I would increase R4 to give the inverting buffer (1st amp) a very high gain. Make R4 1Meg and see the result.

    R6 and R7 are ok at 33k or 100k since they are just a voltage divider.

    Larry

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


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isolated DAC. PWM ( 20khz ) to analog 0-10Volt

isolated DAC. PWM ( 20khz ) to analog 0-10Volt