Activate relay every other input pulse - Electronic Circuits Projects Diagrams Free

Hardhead · 24th February 2008, 05:42 AM

Hi every one I am new to the forum and I hope you will help me.

I am building a project that requires a circuit that will activate a relay from every other input pulse. I would be using a magnetic switch activated from magnets mounted on a spinning wheel that will be rotating At low RPM.

Cheep and Easy is best!

Your help sure would be welcome.

Thanks Hardhead:

Pommie · 24th February 2008, 07:01 AM

You need a divide by 2 counter, better known as a D-Type flip flop. Have a look here. A common D-Type FF is the 74LS74, this actually contains 2 flip flops.

Mike.

Hero999 · 24th February 2008, 01:31 PM

I'd recommend the CD4013 because it has a wider voltage rating.

You can use a MOSFET like the 2N7000 or a BJT like the 2N2222A to drive the relay.

ljcox · 24th February 2008, 10:49 PM

Here is an alternative that avoids ICs.

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24th February 2008, 05:42 AM	(permalink)
Hardhead	Activate relay every other input pulse Hi every one I am new to the forum and I hope you will help me. I am building a project that requires a circuit that will activate a relay from every other input pulse. I would be using a magnetic switch activated from magnets mounted on a spinning wheel that will be rotating At low RPM. Cheep and Easy is best! Your help sure would be welcome. Thanks Hardhead:

24th February 2008, 07:01 AM	(permalink)
Pommie	You need a divide by 2 counter, better known as a D-Type flip flop. Have a look here. A common D-Type FF is the 74LS74, this actually contains 2 flip flops. Mike.

24th February 2008, 01:31 PM	(permalink)
Hero999	I'd recommend the CD4013 because it has a wider voltage rating. You can use a MOSFET like the 2N7000 or a BJT like the 2N2222A to drive the relay. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.