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.
Found in a 1967 General Electric SCR manual, this circuit triggers in case of excess current,...
This circuit was obtained in an English publication from 1981. The 7555 is the CMOS version of the...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...