I found 1000uF worked well for this frequency.įrom the practical point of view a PWM setting of 0 means that the DC level on the MOSFET gate will be 0V and the MOSFET will be completely turned off. For example if you use 256 steps (8 bit operation) the PWM frequency will be 62.45 KHz you will need to use a different C1 value. If you decide to use a different number of steps then you may need to change the R1 and C1 values. The values shown work well an operating frequency of 1.95KHz or 13 bit operation with 8192 steps (2 to the power 13 = 8192). The PWM signal from pin D9 of the arduino is integrated or filtered by the combination of R1 and C1.
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