I have a problem that this may solve, however I need the timer to start when the switch is closed but the switch will remain closed longer than the timer runs. Will this still work? I can only see you depressing the switch momentarily but my situation requires the switch to be depressed, send a timed pulse of approx 1ms, then as it is depressed another timed pulse is sent from a different switch (two switches in one mechanical housing activated in sequence by one plunger - an old fashioned camera shutter release). The second pulse is timed by a simple mechanical contact closing in a clockwork device. The first pulse is to wakeup a digital capture device.
I'm experiencing something really strange. There is one undesired problem in my circuit. Monostable mode. When I turn on the power, output ( pin 3 ) goes high and then low. After that it's ready to do what it is suppose to do. Is there a way to prevent what is happening when truing on power?I need to keep the output low when turning on power. Otherwise the 555 works well in one shot mode. Can you do a test with a diode at the output pin 3 to confirm it, when turning power on?
LOL at depressed switch 😪
Sir you deserve more subs. This is high quality content! I never knew I needed a 555 timer in my life, but I do now!
This helped heaps, thank you!
Glad to hear!
I have a problem that this may solve, however I need the timer to start when the switch is closed but the switch will remain closed longer than the timer runs. Will this still work? I can only see you depressing the switch momentarily but my situation requires the switch to be depressed, send a timed pulse of approx 1ms, then as it is depressed another timed pulse is sent from a different switch (two switches in one mechanical housing activated in sequence by one plunger - an old fashioned camera shutter release).
The second pulse is timed by a simple mechanical contact closing in a clockwork device. The first pulse is to wakeup a digital capture device.
I need to know if adding more LEDs changes the anything else in the circuit?
I'm experiencing something really strange. There is one undesired problem in my circuit. Monostable mode. When I turn on the power, output ( pin 3 ) goes high and then low. After that it's ready to do what it is suppose to do. Is there a way to prevent what is happening when truing on power?I need to keep the output low when turning on power. Otherwise the 555 works well in one shot mode. Can you do a test with a diode at the output pin 3 to confirm it, when turning power on?