Hi,
I was trying to build an astable oscillator using an LM555 timer. In order to obtain a linear triangular wave at the capacitor, I was using two constant current path, one for charge and one for discharge. The charge and discharge currents were 5.96 and 5.92 m Amps respectively. The supply voltage was 15.0. With a 10 uF capacitor, the charge & discharge times were 8100 uS and with 1 uf & .01 uF, the timings were 760 and 75 uS (Micro seconds) respectively. When the capacitance was reduced to 0.001 uF, the charge time was 30 micro seconds and discharge time was 8 micro seconds. also, the the charge - discharge differential increased to 6 V (Instead of 5 v). Can someone give an explanation?
Thanks and regards,
Job
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