piclist 1998\10\01\185043a >
Thread: Possibility of using the PWM output as a proportional DC output??
face BY : Dmitry Kiryashov email (remove spam text)

Hello Craig Lee.

Would you be so kind to make a more precision definitions what you mean
in your qustions. Please add tech information into your inquiry and
around there will be easy to answer you.

1. What is req's for freq's of output signal ?
2. What is req's for maximal ampl. of noises in output ?
3. What type of low-pass filter you apply ? (simple RC network ?)
  (also write current params of RC components)
4. Something else you wish to ask additionaly

WBR Dmitry.

Craig Lee wrote:
> I am attempting to use the PWM output on a '73A through a
> capacitor to ground to get a proportional DC voltage out.
> The PWM frequency is 3090 Hz and the duty cycle is varied.
> However, I get too much ripple on the DC output.
> Any brilliant ideas?  Is my frequency too low? Too high? How
> do I select the proper capacitor? Do I need a diode?

<36141471.329C@aha.ru> 7bit

See also: www.piclist.com/techref/io/pwm/index.htm?key=pwm
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