Here is block diagram of 555 timer:
I wouldn't analyse it, but under some circumstances (for some voltages at THRESH and TRIG pins), complemented output Q will be at high voltage level, with respect to ground (pin 1). And that's problem. For BJT to conduct, VBE is aprox. 0.7V, but in this case it will be much higher than 0.7V. What would happen in this case?
I wouldn't analyse it, but under some circumstances (for some voltages at THRESH and TRIG pins), complemented output Q will be at high voltage level, with respect to ground (pin 1). And that's problem. For BJT to conduct, VBE is aprox. 0.7V, but in this case it will be much higher than 0.7V. What would happen in this case?