Circuit Diagram of Frequency-Coversion Electromagnetic Dotting Timer composed of CD4017

Published:2011/6/26 0:52:00 Author:Vicky | Keyword: Frequency-Coversion Electromagnetic Dotting Timer | From:SeekIC

The main defection of electromagnetic dotting timer is the big shortfall. The reasons are: first, the needle of the electromagnetic dotting timer will cause rubbing effect to the recording paper when dotting and therefore make the moving speed of the paper slow down; second, the electromagnetic is driven by the AC whose voltage has been reduced, and time interval of the dotting is a cycle of alternative current, that is 0.02s. The above circuit as shown in the picture adds a frequency-conversion power by making use of electronic crossover technique on the base of J0203-1 dotting timer commonly-used in senior schools so that the needle of J0203-1 dotting timer can timing with different cycles.



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