Originally posted this yesterday in the 555 timer tutorial thread below, but no response.
I have built the circuit shown in the attachment to automate the on/off for a 24V motor - works fine, but now I need to adjust the timings. I have been playing around with different value resistors at R1 and R2 to do this but whatever I do I can't manage to get a big discrepancy between the on time (t1) and off time (t2).
Ideally what I want is for t2 to be at least five times the length of t1, so if it's on for about 1 second, it's then off for say five or six, perhaps even ten. I have had a look at the timing calculator linked in the other thread and no matter what values I input I can't get such a wide discrepancy. Any ideas?