TurningOffAfterOneSecondApprox. PUBLIC

Not provided.

Turn off the charge (a solenoid) after one second, approximately.

May not work as intended if the switching frequency is high.

When the voltage is present, in the actual position of the switch, the PMOS begin to conduct, but as the voltage in C1 increases, the voltage at the grid of the PMOS also increases, and thus, shut off the PMOS. Pushing SW2 down, Vg becomes zero, but so does the voltage at the charge.

The simplicity of the circuit comes from the DSDP switch.

The exact timing depends on the PMOS, and of the exact C value for the capacitor (value which may depend on the temperature).

I would personnaly use an MCU (a Tiny Arduino, probably) for more stability and more precision.