60h timing circuit

Published:2011/12/1 21:39:00 Author:May | Keyword: 60h timing | From:SeekIC

This timer consists of three parts: power supply double 50Hz square wave generator, frequency dividing circuit, timing display. Its working volt is 5V. Its current is several milliampere. 5G7224A is 4 1/2 bit fully decoded counter driving LCD. It is 60 system and it can direct-coupling LCD. D1~D5 state each bit LCD drive line group. Switch K is used for controlling time/suspend ; Switch AN is used for controlling zero clearing .



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