Hey all, I was in class today, and in order to grasp concepts better, i try to relate them to things i can use them for. Latches are very very helpful for me, but I like to use 12v applications, so busting out the 74HC74 or 74HC112 (i'm still learning these numbers, so correct me if i'm wrong) isn't gonna work (or, could i use them by dropping the voltage before the IC gets power, maybe xener diode or the two transistor method to stabilize voltage?). Can anyone explain how i could wire a single relay for feedback? In other words, design a simple circuit that all i need to do is depress a pushbutton switch to energize the relay (4-pin/contact N-O), and then when i let go, the circuit will continue to run. Further, how would i go about stopping this circuit once it starts? My prof. and I drew the circuit on the board today, but i didn't write it on paper.