Constant current source (CB8697E)

This circuit was found in a 1968s European documentation. It is a current regulator using complementary general-purpose transistors.

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VFO with FET (CB4053E)
This circuit for the 3.5 MHz band (80 meters) was found in an old radio amateur documentation. The circuit...
Self-biasing JFET circuit (CB25563E)
This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input...
Voltage Monitor and Comparator (CB6086E)
We found this circuit in a Popular Electronics of the 80s. The circuit can be made with almost any...