Optical fiber receiver (CB9736E)

This high sensitivity receiver of 30 nW was found in documentation from the 1980s. Integrated circuits are from that time.

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High stability thermocouple amplifier (CB4942E)
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...
Intermittent Accelerated Sequential (CB12139E)
This circuit is from a 1982 publication. It is a sequential effect of accelerated and intermittent LEDs....
Geiger counter 1 (CB7809E)
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...