How would I set up a trigger on one relay with multiple pushbutton inputs?

I'm looking to set up a 12 volt system that has approximately 12 buttons that will each trigger an individual relay and a shared relay.  So I will have 13 relays (numbered 1-13) and 12 buttons (1 -12) - Button 1 will trigger relay #1 and #13, Button 2 will trigger relay #2 and #13, etc. 

Wiring up a single relay circuit is easy enough, and I think I can set it up with an arduino or similar IC, but I'm looking for a discrete circuit design.  Would a simple diode on each circuit leg be enough?  If not, what would I need?

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Just a diode.

chrispaccord (author)  steveastrouk20 days ago

Awesome thanks!

iceng21 days ago

Click the pic to see all four relays and the thirteenth relay..

I let you add as many more relays as you want :-)

ONEof13.bmp
chrispaccord (author)  iceng20 days ago

Awesome, thank you very much for the in depth diagram!

iceng iceng21 days ago

Steve had designed the circuit first...