automatic heat detector
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26-10-2010, 11:55 AM

.pdf   Automatic%20Heat%20Detector.pdf (Size: 52.67 KB / Downloads: 148)
automatic heat detector
This circuit uses a complementary pair comprising npn metallic transistor T1 (BC109) and pnp germanium transistor T2 (AC188) to detect heat (due to outbreak of fire, etc) in the vicinity and energise a siren. The collector of transistor T1 is connected to the base of transistor T2, while the collector of transistor T2 is connected to relay RL1. The second part of the circuit comprises popular IC UM3561 (a siren and machine-gun sound generator IC), which can produce the sound of a fire-brigade siren. Pin numbers 5 and 6 of the IC are connected to the +3V supply when the relay is in energised state, whereas pin 2 is grounded. A resistor (R2) connected across pins 7 and 8 is used to fix the frequency of the inbuilt oscillator. The output is available from pin 3. Two transistors BC147 (T3) and BEL187 (T4) are connected in Darlington configuration to amplify the
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16-11-2010, 07:41 PM

how is this automatic heat detector concept ?
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Tagged Pages: 1000 projects org automatic heat detector electrical project, presentation on automatic heat detector, ppt on automatic heat detectors, project examples on heat detector, project on automatic heat detector, uses of automatic heat detector, operation of automatic heat detector using ic um3561,
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