Bistable multivibrator

The beginning of functioning of the bistable multivibrators can follow with the help of the image, in a scheme that is simplified to the maximum. It consists of two transistors how it is traditional in other devices. If elT2 it works it is thanks the positive current of base that it comes to him across the resistance R1, what it is done by like assistant the arrows they indicate. Under these circumstances, the transistor T1 does not drive it would never do it if it does not receive an exterior intervention in the shape of an impulse. In effect, if there is applied to him a sign of entry of suitable sense on the collectors of the assembly, the situation is invested.

In this another image we have a scheme of more finished circuit. In 1 we have the generator of impulses that controls the bases of the transistors of which this multivibrator consists. In the assumption of which the transistor T2 is an assistant, the diode D1 remains submitted to the important opposite tension, while the diode D2 is not submitted to the above mentioned tension. For it, on having given a negative impulse from the generator (1) and this impulse to be distributed equally by both bases, the diode D2 is the first one in driving, with what the situation is invested and T1 it turns into driver and T2 it is blocked.
This type of bistable multivibrators is used in the microcomputers and in many schemes the action of the diodes can be replaced with the introduction of diodes Zener.

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