The regulator has the big advantage of being short-circuit and over temperature protected. The transistor has neither.I'm just wondering if the circuit would perform better with a transistor instead of the regulator and would also be cheaper ?
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The regulator has the big advantage of being short-circuit and over temperature protected. The transistor has neither.I'm just wondering if the circuit would perform better with a transistor instead of the regulator and would also be cheaper ?
+12v ------>|-------,
(unreg) LED |
|
|
+5v --------, |
| |
| | NPN (or Darl)
500 ohm R C TIP122 etc
pot R<----B
R E
| |
| |
| Rload 4.7 ohms 5w
| | (etc)
| |
Gnd ---------*-------*--