There is an alternate astable circuit that drives the timing resistor directly from the output. Varying that single resistor changes the freq while remaining 50/50. Actually, it's output duty cycle is around 52/48. For perfect 50/50, you have to run the 555 at twice the freq you want and run the output through a toggle flipflop (divide-by-two).How can I make a potentiometer change the frequency while keeping the duty cycles at 50% for both pwm signals?
They are worried about the gate voltage for the FETs.what are you talking about? ne555 works 15V to around 5V. can anyone confirm or deny the dual 555 timer circuit from the image?
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by Luke James
by Rushi Patel