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Darlington triad
From SnesLab
The Darlington triad is an array of three PNP Darlington pairs in the jwdonal schematic, one for each of the three color channels. The pairs are:
- Q3 and Q4 for red
- Q5 and Q6 for green
- Q7 and Q8 for blue
The bases are connected directly to S-PPU2 (pins 95, 96, and 97) and the emitters' signals are sent to the video encoder (pins 20, 21, and 22). The collectors are grounded. Curiously, the green channel is unique in that Q5 and R12 are in parallel with the polarized C83, but there is no corresponding capacitor for the blue and red Darlington pairs.