Suggested by General Electric in a 1965 publication this circuit uses a light bulb. Can be changed to use LED and capacitor can be 22 uF.
This amplifier with differential input uses two old op amps but can be implemented with modern op amps....
This signal switching circuit uses currently unusual field effect transistors and an operational one that...
This JFET amplifier was found in documentation from 1958. The circuit has voltage gain of 4 and 10...