Astable multivibrator consists of two quasistable states and generates squarewave output.The time period depends on feedback resistor and capacitor values and capacitor voltage is presented in green whose value can be determined by Vc=+-BxVsat where B= 1 + R2/R1 connected to positive ends and Vsat = o/p voltage .Vc cannot exceed this value. In this case o/p is 10 volts and capacitor voltage is +- 5 volts.
