555 firing control circuit

Published:2011/6/7 7:41:00 Author:nelly | Keyword: firing control | From:SeekIC

As shown in the figure 11-26, the firing circuit is composed of a double time base integrated block 556 and some resistor capacitor components. It can make single shot, 2 shots, 3 shots, 4 shots and a running fire. The monostable circuit is made of IC1-1(1/2 556) and C1, R1~R4, when K2 fires switch to turn on, the trigger terminal 6 foot of IC1-1 turns to low level at the moment, the circuit is set, output terminal 5 foot is high level. Then IC1-2 astable multivibrator starts to vibrate, the low level of oscillatory wave turns one time in the output terminal 9 foot, J pulls in one time, J also fires one time. The frequency of shoot can be controlled by the reversal time of IC1-1 monostable circuit. The monostable delay time td=1.1(R1~R4)C1.



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