Help Needed
Help Needed
I must first give my apologies for asking a basic question......I am new to the building of circuits.
Well what I'm after is a circuit that has a rocker switch for turning on one LED and some sort of timer relay to turn off the LED after a few minutes......also the circuit needs to run off 9 volt battery.
Many Thanks For Any Help
Rob
Well what I'm after is a circuit that has a rocker switch for turning on one LED and some sort of timer relay to turn off the LED after a few minutes......also the circuit needs to run off 9 volt battery.
Many Thanks For Any Help
Rob
Re: Help Needed
You could use a latching relay and a timer relay, use a N/O (normally open) push button to set the latch and a N/C (normally closed) push button to reset it.
The latching relay lights up the LED and arms the timer. When the timer expires it's N/C contact will go open and reset the latching relay.
Then when nothing is running your batteries don't go flat.
The latching relay lights up the LED and arms the timer. When the timer expires it's N/C contact will go open and reset the latching relay.
Then when nothing is running your batteries don't go flat.
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Re: Help Needed
I kind of agree roughly with Pauldf ... momentary switches or just one switch (touch button) not a rocker. What sort of timer ... 555? is there a max time limit on A 555? I dont see why there should be other than losses...ie if you charge a giant cap at uuA the losses might be more than uuA so it never charges... theoreticaly it could take years to charge.
I will build this circuit when I have time... dont know when that will be though.
Tar&stuff.
I will build this circuit when I have time... dont know when that will be though.
Tar&stuff.