Latching Relay to Use a Momentary Button

If size and cost are the primary concern I would recomend going with a microcontroller.  The size would be extremely small and the cost would be fairly low.  The only issue is developing the code and programming the chip.

The cool thing about a microcontroller is you can do all the debounce stuff with software so you can eliminate quite a bit of circuitry for each button.

I could build a 3 pushbutton in / 3 relay out  circuit for under $10 worth of parts (not counting the pushbuttons or the actual relays).  Like I said, low cost!

You could use an SCR but you have to remove power to unlatch it.

Don't know what this is but I think it is what I am looking for. I want a 12v output controled by a mom pulse but will stay active until I turn off secondary switch.

So, trip rocker switch to power rfid module, activate rfid with fob tripping a latching relay of some sort enabling me to put the fob back into my pocket while maintaining circuit output of 12v. Then when I turn off the rocker switch it resets the system so no power will flow until the fob is reconized again.

will this do it? Can someone explain how it works to a layman?