The circuit is from old documentation but can be implemented with any modern power MOSFET. The type of MOSFET depends only on the voltage and current of the controlled load.
This first-order high pass filter is applicable to any operation requiring a dual power source. It was...
General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs...
This circuit that appears in several versions in this section and on this website was found in...