Broadband amplifier (CB9179E)

Found in an old Popular Electronics, this circuit has a gain of 20 dB. The integrated circuit is uncommon today.

Two-Channel Mixer (CB23869E)
Published in Radio Electronics magazine in March 1963, this circuit uses 4 transistors of the...
Instrumentation Amplifier LM11 (CB14346E)
The LM11 operational amplifier is not common today. The circuit was obtained in the Linear...
Aquarium Heater Intermittent (CB16559E)
This project was found in a 1988 documentation. The circuit intermittently activates an aquarium...