capacitor in darlington pair

[pona]

Whats the use of connecting a capacitor across collector base terminal of lower transistor in darlington pair?

 

[ppdr123]

can u pls elaborate ur question with circuit diagram.

 

[erikl]

... capacitor across collector base terminal of lower transistor in darlington pair?

Miller cap; it reduces the transit frequency (fT, UGB) of the device, perhaps to prevent ringing.

 

[pona]

Here's the circuit