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How to amplify a PWM signal ?

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Hi,
I have a circuit that gives a PWM signal at 20Khz with maximum average voltage at 1.6v. I need to amplify and filter this signal to a variable DC voltage ranging from 0-5v or 0-10v.
I tried using a 741 op-amp and RC filter. It simulates perfectly in Multisim but practically gives a constant VCC at output all the time.

Can someone please help???
 

how to amplify PWM

Hi,
Apply pls -10V instead GND to pin 4...
But be care pls, thes old Op isnt RRIO type, means with +/-10V delivers ca up to +/- 7..8V, depending from your load!
K.
 

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