Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

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Burglar alarm (CB7428E)
This circuit was found in a Popular Electronics from the 90s. The components used are all common...
Overload Alarm (CB6082E)
This circuit is from a 60's documentation. The circuit uses components from the era and serves to...
Divide-by-5 Using the 4018 (NI005E)
One pulse in the output is produce at each 5 pulses applied to the input. The circuit uses CMOS...