MECHANICALLY_CONTROLLED_BISTABLE

Published:2009/7/10 21:12:00 Author:May | From:SeekIC

Applications for this mechanically set and reset bistable are found, among others, in antitheft devices and model railway crossings.The transducers are formed by buzzer BZ1, which sets the bistable, and BZ2, which resets it. Their sensitivity is set with P1 and P2, respectively. The presets are adjusted correctly if the output of buffers IC1A and IC1B just toggles from high to low or vice versa.If all have been set correctly, a slight tap of BZ1 will set the bistable. This tap causes T1 to switch on, which enables, for instance, a relay to be energized. At the same time, D1 lights. A tap on BZ2 or on its mounting resets the bistable, whereupon D1 goes out and T1 is switched off.



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