9V power source (CB21164E)

This simple circuit with a 5V regulator was found in an American documentation from the 90's. The output voltage is adjusted in a trimpot.

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Zero-crossing triac control (CB25871E)
This circuit was found in the July 1995 issue of Electronics Now magazine. The integrated circuit is...
Tape recorder (CB20751E)
This two-year-80s circuit consists of a solution for a small portable recorder powered by cells, as...
1 MHz LED Modulator (CB13535E)
We found this circuit in a 1971 documentation. The circuit can be assembled with more modern...