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12v variable 555 timer circuit with motor

Harrison Redwood

Apr 5, 2016
1
Joined
Apr 5, 2016
Messages
1
I'm trying to make a variable timer circuit that is controlled by a 555 IC running from a 12v supply. I have a basic circuit but for some reason as soon as the circuit is turned on the motor starts spinning and doesn't stop until the power is cut, its like the potentiometer doesn't do anything.
555.jpg
help would be much appreciated, cheers.
 

cjdelphi

Oct 26, 2011
1,166
Joined
Oct 26, 2011
Messages
1,166
The second issue is the 1M resistor with only a 10k potentiometer , that's going to be a very slow pulse with 220uf it might not even trigger the 555
 
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