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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Optical tachometer (CB9349E)
We found this circuit in a 1970 publication by General Electric. The components can be changed...
Symmetrical 15 V Power Supply (CB19622E)
This source is used to supply circuits with operational amplifiers, being originally created for...
Crystal divider by 10 (CB6831E)
Suggested by American documentation from 1968, this circuit divides the frequency of synchronized...