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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. …....
