555 timer help

Thread Starter

Scott O.

Joined Feb 15, 2007
2
I am trying to build a timer for a 12vdc motor. I would like it to turn on for 30 seconds, off for 30 then back on and off and on etc.

Can anyone help me with that circuit? I am not a EE but I have a working knowledge of how to do this sort of thing usually. I am just having trouble with this one. Thanks in advance!

Scott
 

hgmjr

Joined Jan 28, 2005
9,029
I am trying to build a timer for a 12vdc motor. I would like it to turn on for 30 seconds, off for 30 then back on and off and on etc.

Can anyone help me with that circuit? I am not a EE but I have a working knowledge of how to do this sort of thing usually. I am just having trouble with this one. Thanks in advance!

Scott
If you don't mind adding a 5V regulator to your design, I believe you may want to consider setting up your 555 timer (running on 5V) as a clock source that you will feed into a binary counter (running on 5V). The output of the binary counter could then feed a MOSFET driver to handle drive to your 12V motor.

hgmjr
 

Thread Starter

Scott O.

Joined Feb 15, 2007
2
If you have a moment, could you sketch a potential schematic. Please understand I am not an expert by any means. Thanks
 

Lubby

Joined Feb 20, 2007
6
Scott O.

Check out Cana Kit, or simply google 555 timer, and you'll find some good sites with kits and descriptions of their possible functions. I think your looking for an 'astable' timer, or probably more likely a 'cyclic' timer. I've found a lot of info on these sites and others googled.

All the best with it.

Lubby
 
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