I’m an occasional electronics tinkerer, and I’m trying to figure out a switch which closes for one momentary pulse, then latches open until a second switch is opened/power removed. I think I’m not quite finding the right terms to search for, or the results are buried by more common configurations.
I’m modifying an alarm clock so that the alarm must be deactivated by a keyed switch. Keys to be stored a distance from the alarm clock. I’d also like to limit it to one push of the snooze button, just to silence the alarm while retrieving the key.
So I have the keyed switch, closed while the alarm is on. Would like to have another momentary switch, closes for a quarter of a second or so then open despite any further button presses until power is removed by the keyed switch.
I’m pretty sure I could do this with a 555 or maybe something even simpler, but not sure exactly how. Found plenty of info on latching a circuit on after a momentary button press, but not about latching off.
Any help would be much appreciated, thanks.
I’m modifying an alarm clock so that the alarm must be deactivated by a keyed switch. Keys to be stored a distance from the alarm clock. I’d also like to limit it to one push of the snooze button, just to silence the alarm while retrieving the key.
So I have the keyed switch, closed while the alarm is on. Would like to have another momentary switch, closes for a quarter of a second or so then open despite any further button presses until power is removed by the keyed switch.
I’m pretty sure I could do this with a 555 or maybe something even simpler, but not sure exactly how. Found plenty of info on latching a circuit on after a momentary button press, but not about latching off.
Any help would be much appreciated, thanks.