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What does the yellow tip on some adapters mean vs the blue or silverenter image description here

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  • \$\begingroup\$ Welcome to EE.SE. Usually adaptors have a label that identifies the connector pinout, voltage and amps available to use. \$\endgroup\$ – Sparky256 Mar 2 at 5:08
  • \$\begingroup\$ That looks like one of a dozen different size adapters that have different colors. The colours never meant anything to me except easier to find when you have one that fits. \$\endgroup\$ – Sunnyskyguy EE75 Mar 2 at 6:43
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It means nothing, it's just a colour of plastic.

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  • \$\begingroup\$ Usually diameter of outside/inside, or if it has spring contacts. But there is no agreed standard, and conventions may vary from manufacturer to manufacturer. As for polarity, almost all are positive inside. However, in the past (last century), many used to be ground inside, so it is better to check before use. \$\endgroup\$ – Indraneel Mar 2 at 4:50
  • \$\begingroup\$ yes some sets of changable tips are colour coded. SFAIK Panasonic always uses ground inside and most others don't. \$\endgroup\$ – Jasen Mar 2 at 5:10
  • \$\begingroup\$ I did have a transformer based panasonic adapter with ground inside. Not sure if it's still true for the new smps based ones. \$\endgroup\$ – Indraneel Mar 2 at 6:50
  • \$\begingroup\$ I've owned 4 panasonic cordless phones, they're all the same WRT polarity. \$\endgroup\$ – Jasen Mar 2 at 6:52
  • \$\begingroup\$ Always test for polarity with a multimeter - never assume... I was asked to look at an external hard drive, toast because they had used the wrong power supply... Reason was “well it fitted in the hole...”. \$\endgroup\$ – Solar Mike Mar 2 at 7:05

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