diode blocking circuit

Home / the12volt's Install Bay / Car Security and Convenience / diode blocking circuit (

Topic Closed)

Welcome Guest :)

Members

Search

Register

Login

< Prev Topic Next Topic >

silentblackhat

Copper - Posts: 138

Joined: January 14, 2005

Location: New Brunswick, Austria

Posted: May 14, 2007 at 1:35 AM / IP Logged

I am wondering if this is correct.

This is the way I want to wire something up that will activate a relay but i want them isolated. Input #1 is just a 12V switch from the 12v car battery. Input #2 is from a CB radio switch. I want to be able to turn on input #1 to activate the relay but not to 'leak' into the input #2. I placed the diode in the circuit there because when I turn off input #2, if there isnt anything blocking the voltage from #1, it will keep #2 on(because it would keep the #2 device on if it has a 12v supply to it)

Also, what types of diodes will work to do this if it is wired correctly? Will any diode work that I can get at radio shack? I for a 2 pack of rectifier diodes that has a 3amp rating

diode blocking circuit -- posted image.

Any help is appreciated.

Back to Top

Search for other posts by silentblackhat

KarTuneMan

Platinum - Posts: 7,056

This member has made a donation to the12volt.com. Click here for more info.

This member consistently provides reliable information

Joined: December 14, 2004

Location: Isle Of Man

Posted: May 14, 2007 at 10:11 AM / IP Logged

In the member list section, look up hot water wizard. This guys knows........

Back to Top

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: May 14, 2007 at 1:58 PM / IP Logged

Yep-

As long as your input #1 is always at 12V, the diode can be any run of the mill 1A (1N4001).

If at any point you might want to close the switch for #1 and it's not at 12V, then you may have problems blowing something out (either the diode or whatever you're using to drive #2 with), if it's very low impedance, because it may act as a short to ground, depending on where it's coming from. If #1 input is always at 12V, no worries, because the diode will only be driving the relay coil, nothing more.

Back to Top

Sorry, you can NOT post a reply.
This topic is closed.

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

diode blocking circuit

Sorry, you can NOT post a reply.This topic is closed.

Sorry, you can NOT post a reply.
This topic is closed.