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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Standard 1 MHz Oscillator (CB9653E)
We found this circuit in an old American documentation. Transistors can be modern equivalents. ...
Differential Amplifier (CIR18634E)
In the figure we have the conventional configuration of a differential amplifier with the...
LM12 in Parallel Amplifier (CB14389E)
This 8 A high output power amplifier uses two National Instruments LM12s. The maximum capacity of the...