Details regarding the circuit- the TM+ is a varying voltage signal and VDD5 is a constant signal of 5v . Can anyone please tell me the use of the series diode in the circuit ?
I read the discussion, and the cathode of the first diode is connected to Vdd , which in not the case here, so should I be knowing the voltage at point 4 of T201 (emitter voltage) to analyse the circuit ?