Medium impedance stage (CB20563E)

We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the time.

Texas Instruments SN74HCS32 Q1 2-input OR gate
Texas Instruments SN74HCS32 Q1 2-input OR gate This Texas Instruments integrated circuit has 4...
Absolute Value Amplifier (CB4902E)
We found this circuit in an old American documentation. The operational amplifier is not common...
0 to 12 V Power Supply for up to 5 A loads (CIR817E)
This circuit can be used to power loads up to 5 A and the transistors must be mounted on large...