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2 videos. Ranked by independent recommendations, not by views.

1. 

   1 #190: Back to Basics: Transistor Current Sources and Mirrors

   w2aew 7 people · 9 months · since Oct 2015

   Alan Wolke explains discrete transistor current sources and mirrors, ending with LED driving and compliance voltage; suggested as an alternative to an LM317 current source.

2. 

   2 #104: Circuit tutorial: sawtooth generator w/ current sources, diode switches, hysteresis comparator

   w2aew 5 people · 6 months · since Dec 2014

   Linked for its clear explanation of a current source circuit and as an entry point into a well regarded analogue electronics channel.