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Sensors / Detectors: Smoke Detectors
Sensors / Detectors -- Main Page
Last Updated on: Monday, October 03, 2011 06:07 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Circuit forms gamma-photon detector -  24-Apr-03 Issue of EDN  The circuit of Figure 1 includes a PIN photodiode that detects individual photons of gamma radiation. The reverse bias on the photodiode sometimes creates a depletion region. When such a photon strikes this depletion region, a small amount of charge develops.  This charge is proportional to the photon's energy.... [Design Idea by Bruce Denmark, Maxim Integrated Products, Sunnyvale, CA]
LDR & LED Smoke Detector -  Smoke detectors are generally used in advanced alarm systems. Most of this professional devices use gas-detectors, ionization rooms or radioactive elements as sensors. In this circuit we are not using any of this complicated components. Instead of these, we are using two LDRs and one LED. LM1801 special-purpose IC ,which is designed especially for smoke detectors, provides us building this circuit by using the minimum number of components. It includes one internal zener supply, two reference voltage outputs, one voltage comperator, fixing diodes and one 500mA output transistor. …....



Sensors / Detectors: Smoke Detectors
Sensors / Detectors -- Main Page
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