Help with darlington output transistor

[multime]

I am building this power supply and will be using the option at the bottom right of the diagram as the output stage and want to use a tip122 as the darlington driver which will be driving 6 x Tip35c but i am a little unsure about the resistors. Are r25 / r26 integral in the darlington package or do they need to be added. Emiter resistors r28 to r30 are shown as 0.05r  but r27 value is not shown, would this also be 0.05r

 

[PGPG]

Are r25 / r26 integral in the darlington package

You have darlingtom marked with a rectangle drawn with a dashed line.
R25 is insied, R26 is outside.
If R26 would be integrated in Q17 darlington than package would have to have 4 pins.

but r27 value is not shown, would this also be 0.05r

Certainly not.
Voltage drop at this resistor will be at least 0.7V higher than at those 0.05r. I suppose its value depends on exact transistors used (for example on h21e of Q19..Q21).
It is in base of output transistors and not emitter.

[BrokenYugo]

The transistor's datasheet will show any internal resistors and their values.

[multime]

Thanks for the replies, that's solved a few things but without values for r26 -r27 i am going to be stuck.

PGPG
Is this a typo, h21e and should it be hfe

I thought of contacting the original poster of the circuit but sadly he died in 2019

[PGPG]

Is this a typo, h21e and should it be hfe

See top of page 3:
http://www.gvpcew.ac.in/LN-CSE-IT-22-32/ECE/2-Year/ECA-All-Units.pdf

but without values for r26 -r27

These resistors are to not allow Icb0 to drive the following transistors. So you should check in datasheets (not typical values but the max values) and count these R to make voltage at R not enough to drive the next transistor when previous gives Icb0.

[multime]

Thanks PGPG, h21e is something i had not heard of. As for my original post i have taken another look at the schematic and i had assumed Q18 was simply the forth transistor of the output stage, but of course its not its part of the drive for Q19-Q21, silly me. That changes things as the Darlington tip122 should be able to drive the bases of the 6 x tip35c sufficiently as i would want each of them to supply a maximum of 3amp.

[PGPG]

I noticed that I was writing Icb0 when thinking Ice0.