Multi-point control corridor lights circuit

Posted on Dec 11, 2010

Control button switches SB1-SB4 can be installed in different positions corridor, just move SB1 ~ SB4 any one button, lights EL horse lights on, and after decompression transfo

Multi-point control corridor lights circuit
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rmer, rectifier, to supply the integrated circuit 555. 555 integrated circuits, feet have connected 220yF initial capacitor voltage is zero, in an integrated circuit 555 is the first feet high output, relay K puff actuated, the normally open contact K is closed, the entire circuit into the timing of the self-locking status. Since then the power of the first integrated circuit 555, feet charge the capacitor voltage rises. When the electric charge container about 2/3 of the DC supply voltage to the timing between, about 3min. In this case 555 integrated circuits pin output toggles low, so K release, contact switch K automatically disconnected, lamp EL off. Just then press SB1-SB4 any of a button, the forks will re-timing lights turned on.

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