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.

| Clique na imagem para ampliar |

Automatic level control (CB23758E)
This automatic control for recording signal level was found in a Radio Electronics from September...
12 V to 6 V Converter (CB24413E)
This switched-mode circuit was found in the April 1976 issue of Radio Electronics magazine. The...
Wiring finder (CB7950E)
This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to...