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555
ph2t...
Thanks for that bit of info. I think I may have bought useless parts :-(
One question though. The basic astable circuit that I was looking at has the capicitor between pins 1 and 2, so the capacitor charges through R1 and R2, but discharges through R2.
Also,
formula given for t1 (time between pulses)
t1 = .693(R1+R2) * C1
fromula given for t2(pulse length)
t2 = .693(R2) * C1
Therefore, I was think of using a very high value for C1, with a lower value for R2, and using a 10K pot, which, I think, may increase the duty cycle.
Take that with a MAJOR grain of salt, since I only started looking at this a while ago, and I am NOT an EE by any stretch of the imagination.
If I have a chance, I will post the picture of the book I am looking at (from RS - Timer, Op Amp & Optoelectric Circuits by Forrest Mims), if anyone is interested.
Wait...here it is attached. Hope this isn't copyright infringement:
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