How does this multivibrator work?

[aspsrilanka]

How ths multivibrator works? I can't understand.Because its pulse not given to base of transistor.

 

[CEL]

The transistor is in the common base configuration. In this configuration, the input is at the emmiter.

 

[aspsrilanka]

so what happened to the transistor when a pulse is comming.if it turn on ?(revers bias or forword bias)

 

[CEL]

so what happened to the transistor when a pulse is comming.if it turn on ?(revers bias or forword bias)

When a negative pulse arrives at the emitter, its voltage is lower than the base voltage, so the transistor is forward biased.