Harmonic Distortion Meter (CB26186E)

This complex circuit was found in the 1993 edition of the Electronics Experimenter's Handbook. Most of the components are still common today.

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LM317K Regulator (CB24817E)
We found this variable regulator circuit in a Radio Electronics issue from July 1984. It is one of...
High Impedance Instrumentation Buffer MC4741 (CB15268E)
The MC4741 consists of a quadruple 741. The power supply must be symmetrical, and the resistors must be...
Three-phase motor control (CB7268E)
Suggested by Sprague in the 1980s documentation, this circuit can control three-phase AC motors....