The control circuit operates to double from a positive supply, which, when turned on the power of the first door. and goes off when the first drain as shown in FIG. This circuit integrates the LM123, a three-terminal positive regulator and a dc dc + converter, whose output power drains and gates of GaAsFET-power relay in a power amplifier. The controller output drives a three-terminal DC + DC converter - which exit through an N-channel lFET properly so as to pull the base of the series pass transistor 2N6107 at a level to turn it on.
The circuit will supply Tum leak every time the negative potential on the gate fails.