throbscottle
Well-Known Member
I need a cutout for my motor controller, came up with the attached. Works in LTSPice. The relay contacts would be connected so they disconnect the power and latch-up the relay instead (would require manual reset). The "boost cap" is to ensure the relay closes in between disconnecting and re-connecting power to itself. I1/R4 represents the load, R5 is to absorb the voltage differential in the simulation, V1 would be the actual psu. R_sense isn't a real value, its just for the simulation. I decided to use a 5v relay with a series resistor, to give the boost cap a longer discharge time - I know it does nothing in the simulation, it's just what I came up with. R6 is the "go faster" resistor. I just tried different values to find that one.
R2 is there because I want to be able to inject another signal to Q2's base.
I was going for low component count with this hence it's rather primitive.
R2 is there because I want to be able to inject another signal to Q2's base.
I was going for low component count with this hence it's rather primitive.