ADC buffer (CB9313E)

This circuit was found in documentation from Analog Devices from the 90s. The circuit uses components from that time, which are uncommon today.

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Remote control analyzer (CB7812E)
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...
Audio Relay (CB3968E)
This relay circuit with a dual channel MOSFET (not very common today) was found in an old American...
Parallel Port Interface for PC (NI021E)
This application is not modern since few computers have parallel ports. But you can use this...