Optical smoke detector circuit

Details Optical smoke detector circuit Optical smoke detector circuit

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G01N 21/53 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1109540

ABSTRACT An improved circuit for an optical smoke detector utilizing an active band pass filter which has a bias feed- back to the phototransistor detecting element to bias the phototransistor to a static conductivity state of high gain or high sensitivity without regard to whether the photo- transistor is in a high ambient light level or a low (dark) ambient light level.

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