Hi dear members, Im new to this and i can use your help, i know very little about designing a circuit. I am looking for a simple circuit diagram for some gadgets to put in my car (12v) which would give a constant output of 12V (or the same input that powers the circuit) by pressing a button (contacting 2 wires for a second) then i need to cut off the output of 12V by pressing the same button (contacting the same 2 wires) just like you pressing the A/C button on newer vehicles where u simply press the button once and the A/C is activated and u press the same button to deactivate A/C. my car has a old system switch which u press the button it goes in and lock to keep the contact of the 2 wires and u press it again release the lock and the button comes out. i need to upgrade this to one touch. Please any one can draw a simple diagram with all the components? i would greatly appreciate this.