Logic level indicator 7400 (CB22407E)

In the figure we have a simple logic level indicator for TTL circuits or powered by 5 V.

Radiation thermometer (CB7242E)
Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The...
Astable CA3130 (CB8524E)
Found in a 1970s RCA documentation, this circuit generates signals according to the component...
Memory Recorder (CB6786E)
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...