Operational current source (CB8856E)

We found this circuit in a 70s EDN. The circuit makes use of operational of the time.

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20 W amplifier (CB9906E)
The load on this amplifier is 8-ohm. We found the circuit in a 1972 Motorola amplifier manual. The...
Temperature Regulator (CB19407E)
This circuit can control a heating element with a current of up to 5 A. The integrated circuit must...
Wireless Distortion Pedal (CB18018E)
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...