Optical isolator (CB9165E)

This circuit was found on an old EDN and can be used as a shield. Optical couplers are from the era and modern equivalents can be used.

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LED Indicator (CB24694E)
Recommended for automotive use, this circuit is used to indicate the activation of functions. The...
High Impedance Preamplifier (CB941E)
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...
Nicad Charger for car (CB4792E)
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...