You should calculate instead of just wondering.I just wopndered if the feedback given by the 4R7's is a waste of time?
This has been said:As to using different numbers of LEDs in each string; this won't work for the same reason that mismatched LED voltages would cause unequal currents in each parallel path.
I wonder, why many contributors apparently don't understand the obvious stabilizing effect of the transistor current sources, that provide a LED current independent of individual LED voltage drop.
Yes, thank you. I was think of unsaturated, active-forward operation but writing saturated.i think FvM meant "avoided" not "maintained
It has limited capabilities, but it isn't odd. BJT current sources are used in many electronic application fields, where there properties are sufficient, e.g. audio amp bias. In the LED application, the brightness differences due to individual LED parameter variation can be expected a multiple of the current variation effect, even with select exemplars, so it's pretty O.K., I think.The circuit in this tread is an odd current regulator.
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