Toggle on of with timer555 and relay 2 different voltages with relay HELP

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Thread Starter


Joined Nov 17, 2011
Timer 555 and relay circuit with 2 different powers

Hello im got circuit made of that image all works fine

im using two power feeds

one is 5V
Other is 12V

both can be run on same GND

but i want insert spdt relay in it to be able to turn 12v ground to relay so i get 12v of relay to my motor

ne555 is on 5v

i try but bad luck

once im switch power on its pover coil up all ok but im cant tur in off by pressing same momentary button i need disable graund manually to set relay to N-O position when relay on im got N-C

can any one help please


Joined Mar 6, 2009
You've started this same thread in two places here in Homework and in Projects - which causes confusion. I've replied to your thread in Projects. Is this really homework?
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