I want to build an over voltage protection with adjustable voltage limiter. Operation range would be 5-12 volts. The protector would be "self recovery" - it will reset if voltage again goes under that set by Variable Resistor.
Since this will be operate on high current, using relay is preferred.
basically it's just a relay activator that will operate on certain voltage. i.e : Scenario: i want to limit my work at 5 volts max. So the relay will be switched on if voltage is > 5 volts, (set by VR), and again in will be switched off if voltage goes under 5 volts.
This also will protect the worst case emitor-collector leak (i am using linear voltage regulator).
I am thinking about resistors, zener and bipolar transistors. How is the design would be ?