Voltage reference (CB20820E)

This circuit was found in documentation from the 1980s. The circuit can be designed based on modern components.

Metal detector 4001 (CB21723E)
This is one of many metal detector versions of this type found on this site. This one uses a small...
VHF Amplifier (CB3886E)
This circuit was originally designed to measure the gain of two-door RF MOSFETs as indicated by...
High Impedance Trigger (CB21466E)
Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms....