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I am wishing to use an Arduino UNO to control a 12v RGB LED strip. Can I use a transistor instead of a relay? The LED strip has 4 pins: + , R, G and B.

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Yes. A N-Channel transistor of the right collector current capacity on the R, G & B pins can be used.

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  • \$\begingroup\$ Thank you lots! Only one more question. I don't have any TIP31s. What else could I use? Most of my transistors are BC-Somthings \$\endgroup\$
    – Jackpen7
    Dec 18, 2015 at 14:58
  • \$\begingroup\$ @Jackpen7 depends on the current required. How many leds? \$\endgroup\$
    – Passerby
    Dec 18, 2015 at 15:01
  • \$\begingroup\$ Three leds are needed \$\endgroup\$
    – Jackpen7
    Dec 18, 2015 at 15:29
  • \$\begingroup\$ @Jackpen7 your led strip is only three leds, 1 segment long? \$\endgroup\$
    – Passerby
    Dec 18, 2015 at 15:31
  • \$\begingroup\$ Correct, only 1 segment \$\endgroup\$
    – Jackpen7
    Dec 18, 2015 at 15:42

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