on/off timer - Electronic Circuits Projects Diagrams Free

byron · 11th August 2003, 03:22 AM

I am looking to trying to build a timer that will run in a loop constantly and every 30 seconds or so will switch on or off. I would like to have an LED to light up when its turned on. I basically could only come up with a simple 555 timer running with a variable pot. to ajust the time of pulses that I would like to set it on. I will have another resister and a capacitor. I also will have to add an LED to the circuit to let me know when its on. I am a beginner in all of this, so would really like some advice as to how I can make this work and maybe the measurements or other ideas for me to build this timer.

daviddoria · 11th August 2003, 04:10 AM

just do a search here for 555 circuits, there are like 10000 examples lol

let us know if you have a specific question about how the circuits work

byron · 11th August 2003, 04:26 AM

I am looking at the examples now.
I guess what I need to find out first is if I am even looking at the right thing for me.

I am trying to build an on/off timer that would trigger a pulse to a circuit board that will turn on and off water cycles. I need it to run constantly on/off every 30 second, but would like to make it adjustable to change to pulse every minute on some days. I am looking at some relay projects as well and since I am a beginner to electronics I can use all the help to get me in the right direction. I basically just need something to run constantly in a loop and that I can adjust the time of each pulse. Any ideas?

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11th August 2003, 03:22 AM	(permalink)
byron	on/off timer I am looking to trying to build a timer that will run in a loop constantly and every 30 seconds or so will switch on or off. I would like to have an LED to light up when its turned on. I basically could only come up with a simple 555 timer running with a variable pot. to ajust the time of pulses that I would like to set it on. I will have another resister and a capacitor. I also will have to add an LED to the circuit to let me know when its on. I am a beginner in all of this, so would really like some advice as to how I can make this work and maybe the measurements or other ideas for me to build this timer.

11th August 2003, 04:10 AM	(permalink)
daviddoria	just do a search here for 555 circuits, there are like 10000 examples lol let us know if you have a specific question about how the circuits work __________________ thanks, david

11th August 2003, 04:26 AM	(permalink)
byron	I am looking at the examples now. I guess what I need to find out first is if I am even looking at the right thing for me. I am trying to build an on/off timer that would trigger a pulse to a circuit board that will turn on and off water cycles. I need it to run constantly on/off every 30 second, but would like to make it adjustable to change to pulse every minute on some days. I am looking at some relay projects as well and since I am a beginner to electronics I can use all the help to get me in the right direction. I basically just need something to run constantly in a loop and that I can adjust the time of each pulse. Any ideas?