designed by David A. Johnson, P.E.
Recently I was
asked by a company to discover why one of their products failed to operate properly in
cold temperatures. A simplified version of the circuit is shown below.
Two n-channel MOSFETs and a few resistors are wired to form a flip/flop latch circuit. Each time the
pushbutton switch is pressed, the circuit changes state and remains in that state until another activation of the switch.