Is this the way this circuit works ?
Vcc = 15v
With vref = 5v on the pin #5, then Vthreshold = 5v, and Vtrigger = 2.5v, meaning that
Vo = 0 when the capacitor voltage on pin #6 is Vc > 5v Vo = VCC when the voltage on pin #2 is DCC < 2.5v
The capacitor doesnt start to charge until T/2, when the pin #2 triggers, and the timer puts Vo = Vcc.
When the voltage on the capacitor Vc = 5v for pin #6, the timer puts Vo = 0, and the capacitor discharges through pin #7.
If there´s a constant current of:
VbaseQ1 = (15*5.6k)/(5.6k + 3.6k) VbaseQ1 = 9.1304v V330 = 15 - 0.7 - VbaseQ1 V330 = 5.1696v Ie = V330 / 330 Ic = Ie = 15.6654 mA
Finally the tcharge, with Vc = I*t/c, for Vc = 5v
tcharge = 3.1918ms
If the charging starts at 8.3333ms, the capacitor charges until t = 11.5251ms