Circuit for sleep mode (CB8430E)

This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common today.

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Sensor for heart monitor (CB21075E)
We found this heart rate sensor circuit in a Popular Electronics from the 90s. The placement of...
Germanium Transistor Voltage Regulator (CB987E)
This circuit, found in an old magazine of the year 1968, uses a Power germanium transistor. This...
Inverter For Fluorescent (CB10247E)
This project came out in an article of mine (Newton C. Braga) in the Popular Electronics magazine of...