555 simple printing phase timing circuit

Published:2011/5/21 6:18:00 Author:TaoXi | Keyword: simple, printing phase, timing circuit | From:SeekIC

As the figure 17-11 shows, the monostable delay circuit is composed of the 555 and RP1，C1.etc. Every time when you print, because the voltage of C2 can not abrupt change, as a negative pulse adds to the pin-2 of IC, 555 sets, J closes, the light turns on. At the same time, the timing begins. After C1 is charged to 2/3VDD, 555 reverses, pin-3 has the low level voltage, the timing is over. The delay time td=1.1RP1C1. The parameter's maximum delay time in the figure is about 5 seconds. You need to adjust RP1 to the appropriate printing phasetime.



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