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 Basic Electronics
 simple LED circuit
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mnymoen
New Member

USA
1 Posts

Posted - Oct 13 2009 :  3:23:06 PM  Show Profile  Reply with Quote
I am trying to make a circuit which will do the following. If the circuit has voltage applied to it (like 3 volts) then the LED will light up for 2 seconds and then shutoff until the voltage is removed and then re-applied.
Similar to how a car remote works. If I hold in the button to unlock the doors, it doesn't keep unlocking, just one time until I let off and then re-press it.
I can figure out the timer part but not the part that would not reset the relay only when voltage has been removed. I am sure there is an easy way to do it but I have limited experience.

KMoffett
Apprentece

USA
23 Posts

Posted - Oct 14 2009 :  3:26:30 PM  Show Profile  Reply with Quote
From your description you need a "monostable" multivibrator circuit.
http://home.cogeco.ca/~rpaisley4/LM555.html#29
Circuit #1, but replace the two diodes and relay on pin-3 with a resistor and LED.
Are you locked-in to a 3V supply for the circuit?
Where does the "relay" fit in your concept?

Ken
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