Precision AD Converter (CB9026E)

This circuit from the 70s uses components from that time. The converter and SAR are components that are difficult to obtain 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...