variable timed pulses with 555's

Thread Starter

gazz

Joined Oct 30, 2009
22
She works,

powering the pulser circuit's 555 from pin 8, and triggering it from pin 4 via the timer circuit works, no getting stuck on, no variations, no feedback or owt,
I tweaked the trim pots to spit out 25 tokens, and it does that every single time,

now to build the proper circuit all on one board with the 4 timers and the pulser on it, thts when the diode on the ouput of the timers will be needed i guess, as in the simulation triggering one timer without diodes feedsback the other diodes and does bad things, but then again the simulation didnt show up the 'getting stuck' thing with me triggering the pulser via pin 4 and 8, one of those 'theory don't mean squat if it don't work' moments i think.
 

Wendy

Joined Mar 24, 2008
23,421
I think what was happening was the bypass capactor on the power supply to the second timer was being charged, and only slowly discharged thanks to the diode.
 
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