Multivibrator Astable. The voltage on the right side of c1 controls transistor q2. The voltage on the left side of c2 controls transistor q1.
The time period of each states are determined by resistor capacitor rc time constant. The astable multivibrator is another type of cross coupled transistor switching circuit that has no stable output states as it changes from one state to the other all the time. Understanding the astable multivibrator.
When transistor q1 turns on it changes the voltage of c1 so that q2 turns off.
After a short while the voltage of c1 rises back up and turns on the transistor q2. When transistor q1 turns on it changes the voltage of c1 so that q2 turns off. The voltage on the left side of c2 controls transistor q1. Astable multivibrators generally have an even 50 duty cycle that is that 50 of the cycle time the output is high and the remaining 50 of the cycle time the output is off.
