Battery charger (CB9121E)

Found in an Electronics Now from the 1980s, this circuit uses some components that are still common today. For others, equivalents can be tested.

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CMOS Mixer (CB11502E)
This digital mixer uses CMOS integrated circuits. The circuit was originally published in an...
Sound Booster Stage (CB9881E)
This circuit was originally created to increase the power of car radios of the 790s and 80s that...
10 to 84 MHz Colpitts oscillator (CB4052E)
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....