Timeline for What is the use of the transistor in this circuit?
Current License: CC BY-SA 3.0
6 events
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| Apr 20, 2015 at 22:17 | comment | added | KyranF | @jameslarge yes, because there are 3 strands, they still not be perfect, and will consume current differently between them. Using A resistor on each of the 3 strands would fix that on a proportional basis. LEDs are very sensitive to forward current, there would be a huge visible difference. The whole circuit is a travesty, insanely terrible. Let all who see it weep uncontrollably. | |
| Apr 20, 2015 at 22:00 | comment | added | Solomon Slow | Note: Current source driving three parallel strands of LEDs. I don't know how steep the I/V curve of a bright LED is at its typical operating point, but it seems as if there could be substantially different current in each of the three strands. | |
| Apr 19, 2015 at 23:52 | history | edited | KyranF | CC BY-SA 3.0 |
added 900 characters in body
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| Apr 19, 2015 at 23:47 | comment | added | KyranF | @MichaelKaras indeed I shall. And it also appears that the pot and 2.2K resistor to ground form an adjustable current source using the 7805, meaning this circuit is actually a hand-tunable open-loop current source. | |
| Apr 19, 2015 at 23:46 | comment | added | Michael Karas | You may want to add some additional detail to point out that the use of the transistor does nothing to improve the lousy efficiency of this crap circuit. | |
| Apr 19, 2015 at 23:38 | history | answered | KyranF | CC BY-SA 3.0 |