This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in old documentation. Operational equivalents can be used.
Using a pair of 741 op amps, this 90 s Radio Electronics circuit works with the previous one. The...
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...