Voltage-controlled current drain (CB9432E)

This circuit was found in a 90's EDN. The load depends on the used transistor.

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360 degree phase shifter (CB8159E)
This circuit consists of two stages that each shift 180 degrees the signal. The circuit was...
Battery Tester (CB16738E)
This simple battery tester uses two transistors to drive LEDs of different colors, indicating the...
RIAA Line Drive Amplifier (CB8932E)
Found in 90s documentation from Analog Devices, this circuit employs operational amplifiers of the time....