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Thread: PWM circuits

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  1. 01-14-2016, 06:02 AM #1
    vegipete
    vegipete is offline Registered
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    Re: PWM circuits

    Some filtering turns the PWM into an analog value. Then one (or a few) op-amps can amplify, invert and offset the 0 to 5 volts to 10 to -10 volts.

    The trick though is getting a sensible output when the input is not running. If the PWM is off, what should the output voltage be, considering safe operation?
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  2. 03-07-2016, 04:38 AM #2
    Larken
    Larken is offline Member
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    Re: PWM circuits

    Yes , you can use a simple RC filer on the pwm then a differential opamp to offset and double the voltage

    Quote Originally Posted by vegipete View Post
    Some filtering turns the PWM into an analog value. Then one (or a few) op-amps can amplify, invert and offset the 0 to 5 volts to 10 to -10 volts.

    The trick though is getting a sensible output when the input is not running. If the PWM is off, what should the output voltage be, considering safe operation?
    You have the PIC output a delayed enable to the amplifier to only turn it on when its stable. Thats what i do on my step2linear
    Manufacturer of CNC routers and Viper Servo Drives
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