This circuit was found in an American documentation from 1975. The components of the time can no longer be found easily, but they can be tested equivalent.
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...
This circuit uses the LM34 sensor for degrees Fahrenheit and has a scale from 3 to 300º F...
This circuit was found in the May 1972 issue of Radio Electronics magazine. The activation code...