KitsGuru Astable multivibrator using Transistor Educational Electronic Hobby Kit

An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined by Resistor Capacitor ( RC ) time constant. The working can be unserstood clearly from the given circuit diagram. The components R3,C1 and R2,C2 determine the on off period of the transistor. Both the transistor keeps turn on and off alternatively as per period.