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>> No.1165446 [View]
File: 35 KB, 840x334, il300.png [View same] [iqdb] [saucenao] [google]
1165446

>>1165442
The basic idea is the same as in pic related.
The transistors just form an amplifier with lots of inverting gain. It is made of two emitter followers, both having plenty of current gain but no voltage gain. The PNP-NPN pairing kills the offset voltage. So, the voltage at Q1's base is reflected across R4, which is turn sets the LED current.

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