darlington transistor current gain circuit for audio - SERP Analysis

https://en.wikipedia.org/wiki/Darlington_transistor

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https://www.scribd.com/document/190620710/Darlington-Pair

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https://techtalk.parts-express.com/forum/tech-talk-forum/12899-darlington-transistors

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https://www.youtube.com/watch?v=f2JKgvDGX8k

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https://www.youtube.com/watch?v=TNfxmxt6RMw

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http://sequence15.blogspot.com/2010/10/electricity-for-synth-diyers.html

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https://learnabout-electronics.org/Amplifiers/amplifiers43.php

https://forum.arduino.cc/t/darlington-transistor-as-a-switch-for-solenoid-control-valve/1002482

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https://pinside.com/pinball/forum/topic/darlington-pair-operation

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https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_7

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https://www.physicsforums.com/threads/analyse-this-amplifier-for-me-please.821133/

https://audiokarma.org/forums/index.php?threads/easy-basic-testing-of-darlington-power-pack-stk-sanken-etc.1044163/

https://www.eevblog.com/forum/chat/darlingtons-used-as-audio-output-devices/