RF Monitor (CB21686E)

This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The diode is germanium type.

Amplifier with the 4049 (CB4770E)
This different audio amplifier was found in a 90's Electronic Design. The circuit uses components...
Current Booster (CB9004E)
Using components from the 70s, this circuit can be implemented with modern equivalent components....
Voltage reference (CB20820E)
This circuit was found in documentation from the 1980s. The circuit can be designed based on...