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Do they make LEDs that have a resistor built-in on the anode? If not, why not?

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    \$\begingroup\$ Yes, they make LEDs with built-in resistors. Since they're in series, it doesn't matter whether it's on the anode or the cathode. \$\endgroup\$ – Dave Tweed Jan 31 '15 at 20:03
  • \$\begingroup\$ @Kslkgh Why do you want the resistor specifically on the anode side? What difference does it make for you? \$\endgroup\$ – Nick Alexeev Jan 31 '15 at 21:12
  • \$\begingroup\$ @NickAlexeev - I'm just used to connecting an LED with the resistor on the anode. I don't desperately want one, it's just how I'm used to connecting them. \$\endgroup\$ – user65640 Feb 1 '15 at 8:03
  • \$\begingroup\$ @DaveTweed - Could you post me a link? \$\endgroup\$ – user65640 Feb 1 '15 at 8:03
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    \$\begingroup\$ @user65640: Google "led integrated resistor" \$\endgroup\$ – Curd Aug 1 '16 at 7:57
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Yes, you can get them (I've just checked the Maplin Electronics web site). They tend to be optimised for a few common voltages only, and then only for small indicator LEDS where the current draw is low.

For bigger LEDS intended as light sources, you're expected to provide a suitable regulated power supply.

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