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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LM390 Intercom (CB25310E)
This two-channel wired intercom was found in the April 1990 issue of Radio Electronics magazine....
Symmetric Power Supply (CB15712E)
The voltage of this symmetrical power supply depends on the regulating integrated circuits, which...
Stair Generator (NI018E)
A staircase signal is produced by this circuit using a TTL IC and an operational amplifier. The...