Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is unusual today. The sensor is a thermistor or NTC.
We found this circuit in an English publication from 1980. It provides a logical output signal when...
With the circuit shown, we have an excellent level for the signal obtained from an electret...
The circuit presented was found in a documentation from the 1950s, generating a sinusoidal signal...