Found in American documentation from the 90s, this circuit triggers a buzzer with a Sonalert-type oscillator when the temperature of the sensor reaches a certain value set in R2.
This circuit is from a 1965 Argentine publication (Radio Chassis Television). The original...
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...
The components of this filter are calculated using conventional formulas (see mathematics section of...