JP 555 timer (2)

better circuit for to get a 50% duty cycle uses a feedback loop- no discharge pin needed -works for my frequency, make sure R1 is high and use F=1/0.693(2R2)C to find what value of R2 is needed to generate a frequency F or equivalent time period T T=1/F T(ON)=T(OFF) for perfect square wave = 50% duty cycle