Author Topic: LOTO practice(1): RC resistance-capacitance —— low-pass filter PWM to DC  (Read 652 times)

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Offline jiangtao.lvTopic starter

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Resources used in the experiment: 1.5K resistor, 22u capacitor, oscilloscope, adjustable PWM wave.

 Note: The selection of resistance and capacitance does not need to be accurate, in fact, it is enough to combine a low-pass filter with a very low cutoff frequency. For example, our chosen value is equivalent to a low-pass filter with a cutoff frequency of 4.8 Hz.

Two methods are described and practiced in the video. The first is software control of the duty cycle of the OSC482 with PWM to adjust the RC filter to generate DC. The second is to generate a square wave through the S02 signal source module, and manually adjust the amplitude of the square wave to change the DC value.

Here is the video: https://youtu.be/ftgFqXiWJVA
 
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