Multivibrator monostable

We are going to see of what the multivibrator consists monostable, also used often in the computers of the integral systems of ignition, and of the general microcomputers of control of the injection and other services of the motorcar.
It is called a multivibrator monostable to a device formed by two transitores capable of happening from the stable state to unstable other, for the effects of an impulse, with the peculiarity of which the unstable state has a duration that depends on the constants of the device. Everything begins again when a new impulse takes place.

In the image we see a scheme of this device where the impulses generator can be appreciated in (1). When this one does not work, the positive current happens to feed the base of the transistor NPN (T1) across the residence R1, and becomes an assistant, preventing the functioning of the transitor T2. If a negative impulse is sent B1 proceeding from the generator (1) the base circuit of T1 is cut and the transistor is blocked. This allows the feeding of the base of T" and the conduction of this transistor. The load of the condenser C1 makes to raise the tension as a constant of time that depends on the values of R1 and of C1, and when he acquires a few vauficientes the base of T1 recovers his current, by what T2 it is blocked.

If you were interested in this topic, perhaps also you were interested in...
Multivibrator astable
Bistable multivibrator