UM3561 high temperature detector circuit diagram

Posted on Feb 5, 2014

This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the temperature close to the T1 transistor is hot, the resistance to the emitter collector

UM3561 high temperature detector circuit diagram
Click here to download the full size of the above Circuit.

goes low and it starts conducting. In same time T2 transistor conducts, because its base is connected to the collector of T1 transistor and the RL1 relay energized and switches on the siren which produce a fire engine alarm sound. This electronic project must be powered from a 6 volts DC, but the UM3561 IC is powered using a 3 volt zener diode, because the alarm sound require a 3 volts dc power supply.

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