Monochrome TV Pattern generator (CB9421E)

Using an integrated circuit from the time, this circuit was found in Radio Electronics from the 90s. The ZNA234E is an unusual component today.

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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...