This project for the over-heat detector uses a 10k NTC thermistor. Circuit and working. The circuit diagram of the overheat detector is shown in Fig. 1. It is built around a negative temperature ...

Automatic Heat Detector Circuit. The second part of the circuit comprises popular IC UM3561 (a siren and machine-gun sound generator IC). It can produce the sound of a fire-brigade siren. Pin numbers ...

This infrared detector circuit uses a passive IR-detector component PID20. It converts heat radiation into electrical impulses. The output voltage of the PID20 increases when an object comes close to ...