| Electronics > Beginners |
| Panel LED low current drive |
| (1/1) |
| rakeshm55:
Is there simple circuit/chipsets for driving panel LEDs(Low current)??It should have on off control... Primary aim is to provide consistent illumination for panel mount LEDs |
| james_s:
Typically one just uses a resistor. You can get ICs for driving low current LEDs, they are essentially active resistors, I don't recall the part number but it should be easy to find. |
| Kjelt:
What voltage what current, we need more specifics. I myself use for some 36V led panels with 200-300mA a LM317 as current regulator but on the low side. That way he only gets 2 or 3V relative to ground. |
| rakeshm55:
5mA to 40mA current panel mount indicator LEDs |
| Kjelt:
--- Quote from: rakeshm55 on July 27, 2018, 05:38:33 am ---5mA to 40mA current panel mount indicator LEDs --- End quote --- In that case: -resistor OR - LM317, the cheap to220 version suffices In both cases bring the voltage down to about 2-3V more than the Led Vf to minimize the powerloss. To achieve that use a switch mode voltage regulator such as the cheap ones on Ebay. On/off control could be a small P-fet switching the voltage to the resistor or lm317. |
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