Synchronized Triac Switch (CB26127E)

This zero-crossing circuit was found in the 1989 Radio Electronics Experimenter. The Triac must be controlled according to the load.

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XR2206 Function Generator (CB24506E)
This simple version of a function generator with the XR2206 was found in the May 1977 issue of...
Universal Crystal Test (CB21786E)
In a modern version this circuit can use an LED in series with a resistor in place of the lamp. The...
Variable Frequency Oscillator (CB4050E)
This VFO was found in a 1980s documentation. The central frequency is given by the crystal and the...