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



Any help is appreciated

 

yes that will work

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">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)</TD></TR></TABLE>

I dont understand what input #2 is. If #2 is like a remote wire I'm not sure what your trying to do. But yes the diode will prevent 12V from going from 1-&gt;2. But it will not prevent 2-&gt;1.

My only concern is the current demands on #1 or #2 I assume you have worked that out and have chosen an appropriate sized diode.

 

the current going through the diode is about 500mA. Its a 3amp diode so i should be good