Voltage reference (CB8466E)

Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA. The load current is 200 uA.

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...