# Darlington pair. Purpose of components

Giving the following schematic: What is purpose of R1 and the diodes ?

• Not enough context. Post the surrounding circuit, or where you got the schematic from? It looks to me like $R_1$, $R_2$ and the associated diode are there to speed up turning off $T_2$. The diode on the right is either intrinsic (if it's a monolithic Darlington pair) or it's there on purpose because the expected use has the collector voltage falling below the emitter voltage. – TimWescott Dec 10 '18 at 16:25
• That's the whole circuit. I found it as a "better design of a darlington pair". – Baciu Vlad-Eusebiu Dec 10 '18 at 16:27
• R1 and (R2 + diode) are here to speed up Cbe capacitor discharging time also they make sure that the leakage current does not turn-ON the Darlington. – G36 Dec 10 '18 at 16:29
• But I suspect that this left diode should be connected between B and E terminals. – G36 Dec 10 '18 at 16:33
• The left diode speeds up turning off the 2nd transistor when the B terminal is grounded. – Andy aka Dec 10 '18 at 16:34