Learn about 555 Missing Pulse Detector to improve your skills and design your electronics projects yourself.
Where can I get 555 Missing Pulse Detector Circuit Diagram with Explanation?
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How to design a 555 Missing Pulse Detector (electronic circuit)?
You can easily design the 555 Missing Pulse Detector circuit by practicing the exercises given below. Here you can design and simulate your own electronic circuits with this Online Circuit Designer and Simulator.
This circuit uses a 555 timer chip to detect a missing pulse. The input is a square wave. When you click the logic input (the "L") to bring it high, then the input will stop oscillating and stay high. The 555 will detect this and bring the output low.
The 555 is wired as a monostable. But whenever the input goes low, it turns on a transistor which quickly drains the capacitor. When the input goes high, the capacitor recharges, but doesn't quite make it to the threshold voltage before the input goes low again. If the input stays high, then the capacitor is allowed to charge fully, and the 555 timing interval ends, bringing the output low.
