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.
This circuit, found in a Popular Electronics from 1992, is based on an oscillator and a crystal...
This circuit is from the SGS manual of linear integrated circuits of 1982. The L78xx is equivalent to...
Mouser Electronics has in stock Amphenol FCI Booltrack ™ connectors for robust connectivity...