Hall current monitor (CB7384E)

Found in an EDN from the 90's this circuit makes use of unusual components today.

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Arcs suppression in relays (CB8841E)
Found in a 1964 Electronic Design, this circuit suppresses arcs that occur in contacts when a...
3 and a half digit LCD converter (CB4912E)
The component used in this circuit is not very common today as the circuit is from the 80's. It...
LM12 Amplifier (CB25205E)
We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of...