11 basic circuits of 555 multi-vibrator

Published:2011/7/5 0:14:00 Author:Zoey | Keyword: 11 basic circuits, 555 multi-vibrator | From:SeekIC

As shown in picture (C), after adding the conduction diode D1 and D2, the charge and discharge time constantwill be separately adjusted. If R1=R2, the duty cycle is 50%. This goes for picture (D), too. The charge and discharge capacitance arrive at C1 via C, so C1 can get charged to 2/3 VDD quickly and the upper comparator will be turnover and replaced. After being replaced, C will discharge and the voltage of its two terminals will fall to 1/3 VDD, 555 will deposit. The oscillator frequency in picture (f) is higher than that in (a)~(b); The circuit in picture (g) can obtain negative narrow pulse; the circuit in picture(h) can produce a pulse square wave of a 50% duty cycle; the circuit in picture (i) has an adjustable charge and discharge time constant; the circuit in picture (j) has independent charge and discharge time constant. When circuit in picture (k) is galvanized, pin 2and pin 6 will be in high level, 555 will deposit and pin 3 will be in low level of 0, then the discharge tube in IC will be saturated and conducted. f and R will be in direct ratio while f and L will be in inverse ratio.



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