Video Amplifier (CB21321E)

Found in Popular Electronics from the 90s, this circuit is intended for amplifying analog video signals.

Crystal unijunction oscillator (CB20679E)
This circuit was obtained in an Electronics World of 1969. It is a crystal oscillator with a 100...
Variable Gain Instrumentation Amplifier (CB15876E)
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...
Precision Shadow Alarm 741 (CB25479E)
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...