Meeting Timer Circuit

Published:2011/5/18 9:39:00 Author:Joyce | Keyword: Meeting, Timer | From:SeekIC

As shown in the figure the limited time of this circuit ranges from 5 minutes to 1 hour. PR1, C8 and C9 are the timing components. The sockets for 220V AC power supply,which controls the audio power amplifiers are CZ1 and CZ2. To press AN2, 555 means reset and start .Its feet ③ outputs high level, which will trigger the thyristor to make it breakover.And when CZ1 and CZ2 have voltage，the timing will begin. KD - 153 will produce sounds for a few seconds to indicate the circuit is proper.When the timer stops,feet 5553 will output low level,thus VS will turn off, and no voltage will be on CZ1 and CZ2.After hearing sounds produced by KD - 153 for a few seconds ,the limited time for the meeting is up. The circuit is alsoapplicable for other control circuits which needs timing.



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