Over-voltage protection

[Demon]

... if you want the zenner to be a crowbar and blow a fuse, there are better ways.

How about this modification to that link I posted above?

- Green LED remains ON while voltage remains under 5.6V.

- Red LED turns ON when voltage reaches 5.6V, and Green LED turns OFF.

- SCR shorts out Fuse and protects everything to the right of this circuit.



This way I get a light on the unit that gives an indication as to what went wrong.

I absolutely hate products that DIE, and you're left clueless what went wrong.

Robert


EDIT: I'm just not sure about the need for that 1N4007 for my application. It will cost me a voltage drop to add that in.