The integrated circuits used in this thermometer are not very common today. The indicator is a microammeter for a scale from 0 to 100o C. The supply must be made with a voltage of 1 to 12 V.
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...
This circuit for frequencies of 20 to 2 kHz was obtained in English documentation from 1966. The...
This timer can control loads up to 240 W. We found it in a 1967 RCA documentation. The main...