Timed reversing polarity circuit

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xtremespeed

Member - Posts: 38

Joined: February 10, 2006

Location: Texas, United States

Posted: February 26, 2006 at 11:14 AM / IP Logged

I have a 2 wire 12v electric motor that I want to power off a spst rocker switch. I want it to run for 3 seconds when I turn the rocker switch on, and then run in reverse for 3 seconds when I turn the rocker off. I think I could use relays with a capacitor for the timed part, but not sure exactly how to wire everything.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: February 26, 2006 at 12:01 PM / IP Logged

Yes, you could design an LCR circuit and create your own timer, but why not just buy a timer? There are many available, like this one, in all sorts of configurations, and they will give you the ability to adjust and fine tune your on-off cycles and delays. Mush easier.

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xtremespeed

Member - Posts: 38

Joined: February 10, 2006

Location: Texas, United States

Posted: February 26, 2006 at 3:09 PM / IP Logged

Thanks for the idea. Actually the whole motor, switch and everything is worth less than that timer. I was kinda hopeing that I could accomplish this inexpensively.

KPierson

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This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: February 26, 2006 at 10:13 PM / IP Logged

What are you planning on using to drive the motors? I would assume you are looking at a 5 wire setup which would take two relays. What kind of current are you using? Is the run time always going to be 3 seconds? What is this for?

I can provide a cheap circuit to acomplish what you are looking for using a programmable microcontroller. PM me or check out the link in my profile if you are interested in my help.

Good luck!

Kevin Pierson

xtremespeed

Member - Posts: 38

Joined: February 10, 2006

Location: Texas, United States

Posted: February 28, 2006 at 10:35 PM / IP Logged

Pm sent. Thanks Kevin.

Can someone tell me, using the schematic for constant to momentary in relays special applications, what value capacitor would be needed to achieve a 3 sec output?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: February 28, 2006 at 10:51 PM / IP Logged

you would need a 3 second delayed off timer. This one can be made easy.

Timed reversing polarity circuit -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: February 28, 2006 at 11:03 PM / IP Logged

Then you need to figure out how to hook it to the switch without frying it,

Here is a motor reverse switch circuit.

Timed reversing polarity circuit -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: February 28, 2006 at 11:52 PM / IP Logged

Like this!

Timed reversing polarity circuit -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: February 28, 2006 at 11:59 PM / IP Logged

If it works let me know.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

xtremespeed

Member - Posts: 38

Joined: February 10, 2006

Location: Texas, United States

Posted: March 01, 2006 at 9:16 AM / IP Logged

Thanks. That gives me some great ideas to work with. Won't quite work because that is a spdt switch, and I'm using a spst. So the switch will provide 12v when on, and open when off.

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