Led smoke detector circuit

Details Led smoke detector circuit Led smoke detector circuit

G - Physics

01

N

340/140.1

G01N 21/01 (2006.01) G08B 17/10 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1051539

ABSTRACT OF THE DISCLOSURE A simplified smoke or other particle detector circuit includes a light emitting diode in series with a compensating photocell and a photocell sensing LED light scattered from particles. In parallel with the LED is a high resistance, and in parallel with the photocells is a low resistance, the resistances having a common junction coupled to a threshold circuit input as is the output of the photocells. Sensing smoke produces a photocell output which triggers the threshold device to generate an alarm signal. Failure of the LED produces a voltage at the resistance junction which similarly triggers the threshold device to alarm.

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