Solenoid Timer Module

techzoman · Mar 2, 2008

Hi everyone... New here, just have a little problem I thought someone might know how to fix. On one of my little projects I have a solenoid circuit setup to go off on a timer circuit, however the timer is not very accurate at shutting it off and sometimes stays on for minutes. How could I go about building an electronic timer module that, when voltage is applied, it makes the connection for a couple seconds and shuts off until the next cycle? The circuit is around 12-18vDc right now (car battery).

Thanks for all responses to this!

techzoman

IanP · Mar 3, 2008

You may build a 2-second-power-on-triggered-timer based on the very popular 555 IC ..

Here is an example:
http://www.kpsec.freeuk.com/projects/timer.htm
time calculations you can find at:
http://www.kpsec.freeuk.com/555timer.htm#monostable
and if you need external transistor to boost solenoid's current above, say, 100mA, here is how to do it:

Regards,
IanP

techzoman · Mar 3, 2008

This should work. I'll check it out tomorrow and see what happens. Thanks Ian, and I appreciate the reminder of incorporating an external relay, I can just about picture me running back to RadioShack for another 555, I don't think it would like a couple amps going through it very well

techzoman

Solenoid Timer Module

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IanP

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Solenoid Timer Module

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