That latch idea is neat! Both should work a treat. Anders
On Wed, Dec 7, 2022, 9:44 AM Patrick Finnegan via cctalk < cctalk@classiccmp.org> wrote: > On Wed, Dec 7, 2022 at 12:40 AM Jim Brain via cctalk < > cctalk@classiccmp.org> > wrote: > > > This might be a bit off topic, so forgive me if so. > > > > The issue is a 24VAC motor with one connection to 24VAC and the other > > gated via two switches. The first switch is a momentary one and the > > second is in parallel and connected to the motor. A long enough > > momentary depression on the first switch actuates the electric motor > > enough to close the second switch, which then stays closed for 1 > > revolution. > > > > The problem is that a quick enough press and release of the first switch > > does not allow the motor to move far enough to close the second switch. > > > > Given the configuration, my general plan was a small one shot timer > > circuit that energized when the switch was initially depressed and then > > closed a relay in parallel with the first 2 switches, with a time period > > that was 1/10 to 1/2 the time of the motor revolution. a quick close and > > release of the first switch would start the timer, which would then > > close the parallel switch and then open it a short time later, and then > > the motor switch, which would still be closed, could signal the end of > > the cycle. > > > > My two thoughts would be: > > 1) A 555-timer in one-shot mode > 2) An S-R latch at is set by the push button, and cleared by 2nd switch > > Pat >
