steed5000
Newbie level 1
Question: can you have a 555 timer circuit with one on button and one off button (cancel/reset) that consumes no curent when the timer has ended, like when you make a latching circuit with relays??
The project: I have built a bedside lamp with 3 white Cree LED's running off a small bank of PP3 9v batteries (I have loads of used but good batteries due to my job in instrumentation), 3 LEDs in series, they have a rating of 3-3.2v each so total of 9v together, I built a PCB using the 555 timer with one start button (starting the timer for 40mins) and one cancel button to turn off the lamps but the power used by the timer in the ‘off’ state still pulls a current and after a day or so my power pack is dead, if I just use a normal on/off switch the batteries last for 6 months+ when using for 1 hour a night max, basically I need a circuit that when the timer cuts off the PCB is not drawing any current at all until pulsed again to start the timer and when finished it cuts off again, I think this could be a handy thing for other people as I have seen similar problems on other forums. I will attach a diagram so you can see the project so far.:|
The project: I have built a bedside lamp with 3 white Cree LED's running off a small bank of PP3 9v batteries (I have loads of used but good batteries due to my job in instrumentation), 3 LEDs in series, they have a rating of 3-3.2v each so total of 9v together, I built a PCB using the 555 timer with one start button (starting the timer for 40mins) and one cancel button to turn off the lamps but the power used by the timer in the ‘off’ state still pulls a current and after a day or so my power pack is dead, if I just use a normal on/off switch the batteries last for 6 months+ when using for 1 hour a night max, basically I need a circuit that when the timer cuts off the PCB is not drawing any current at all until pulsed again to start the timer and when finished it cuts off again, I think this could be a handy thing for other people as I have seen similar problems on other forums. I will attach a diagram so you can see the project so far.:|