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Small LED Current Limiters

Discussion in 'Tips and Tricks' started by AA4PB, Jul 21, 2021 at 11:55 PM.

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  1. AA4PB

    AA4PB Ham Member QRZ Page

    While rigging up some backlight LEDs for meters, I ran across these small LED Current Limiters from that automatically limit the current through a string of LEDs. Even if the supply voltage changes, the current remains constant. They are available in 10mA and 20mA models. They are only $5.91 for ten units. Much nicer than using a resistor.
    WE4E and N0TZU like this.
  2. NC5P

    NC5P Ham Member QRZ Page

    ON Semiconductor makes those. They also have larger current models and you can parallel them to get even more current. I used to work for a lighting company that bought hundreds of thousands of them on reels.
    AB1YW and N0TZU like this.
  3. AA4PB

    AA4PB Ham Member QRZ Page

    ON Semiconductor probably makes the SMD devices, but provides them mounted on a tiny PC board with through hole solder points to attach your wires and clear heat shrink tubing to insulate the assembly.

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