The PWM need to be fix to a constant frequency. I am using IC 555 timer to produce the PWM. So I try to put a parallel diode at end of each variable resistor leg, and it proved it can be control. From my research, an astable circuit produces a 'square wave', this is a digital waveform with sharp transitions between low (0V) and high (+Vs). I noticed that the duration's of the low and high states may be different. The value for R1, Rv and C1 can be calculated later on.
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