556 photoelectron pulse detectors omission


Posted on Mar 28, 2007

As shown in FIG photoelectron pulse missing detection circuit. The detector consists of optoelectronics slotted switch H13B1, dual time base circuit 556 with some RC components


556 photoelectron pulse detectors omission
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constituting the one-shot multivibrator and other components. It opened a few millimeters slots between the arc tube and the photosensitive optoelectronic switch H13B1 tube inside. When the external light blocking object into its slot, H13B1 internal photodiode beam path is cut off due to a high-impedance so IC1-2 (1/2 556) pulse signal detector due to lack of a reset signal and output high into the temporary steady state, transient stability corresponding time td 1.1RwlC2, and adjust W1 can be changed td. If the signal interruption longer than the temporary stabilization time of magic, the IC1-2 reset, active low output enable pin BG1 end, SCR SCR conduction, so that the corresponding load RL is energized, or the power supply circuit is disconnected, or issue alarm signal. Multivibrator IC1-1 (1/2 556) and R1, R2, C1 and other components, the oscillation frequency of f 1.44/(R1 + 2R2) C1, the icon parameter corresponding oscillation signal frequency of approximately 2.5kHz 99% duty cycle, high duty cycle of the pulse signal driving the H13B1 luminous tube lighting.




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