This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
EZP-Q metallized polypropylene capacitors from Panasonic's can be purchased from Mouser...
This circuit was found in 2003 documentation, but all components used are still current. The alarm...
This circuit was suggested by Motorola's 1993 Linear Interface ICs. Equivalent operational amplifiers...