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I cut the head off a micro USB power supply thinking I could improvise a full micro USB cable. I found only Vcc and gnd wires. So, I decided to tear into the connector itself. Inside the connector was this USB to micro USB adapter. Seems like 5-to-4 wiring with one of the pins on the 5-pin side not connected to anything--how a micro USB to USB should be wired. I tested connectivity with a multimeter, but I can't get any solder to stick on the D+ and D- pins on the 4-pin side. What type of material is this?

enter image description here

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Try scraping it and or scratching it, then hold the solder iron on the material for a while to heat it up and apply solder directly to the solder iron and the material at the same time.

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    \$\begingroup\$ The scratching / filing / sanding of the surface to remove oxidation is as important as using enough flux in my experience. That applies to the wire as well. By it's black colour the wire appears to be heavily oxidized. Tin the wire first. (I can't tell properly from the photo if the wire is tinned or black.) \$\endgroup\$ – Spoon Jan 8 '15 at 13:21
  • \$\begingroup\$ I spent ~20min trying different techniques except for scratching the surface and using flux. Will try those. \$\endgroup\$ – brooksbp Jan 12 '15 at 4:13
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Can't really tell from the photo what material it is... but have you tried putting some flux on it (and heating it of course)? The surface may be quite oxidized even though it may appear fine.

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  • \$\begingroup\$ Will try some flux. Thx \$\endgroup\$ – brooksbp Jan 12 '15 at 4:13
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Probably aluminium. Aluminium forms an oxide layer over time making hard to solder to. Try scraping it as said above, there is special aluminium flux you can buy that will help to remove the oxide layer.

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  • \$\begingroup\$ No. Aluminum is not used in such applications, precisely because of the oxide. Aluminum in only used in electrical/electronic applications where the special measures required to make it possible are offset by an advantage, and this is not one of those places. \$\endgroup\$ – Chris Stratton Jul 3 '19 at 13:47
  • \$\begingroup\$ @ChrisStratton Nickel then? \$\endgroup\$ – Mike Seeds Jul 3 '19 at 14:10
  • \$\begingroup\$ Its best to make a comment on the original post as opposed to an answer if you're not sure or only have a probable answer \$\endgroup\$ – theguitarfreq Jul 3 '19 at 15:28
  • \$\begingroup\$ ^^ This is why I hate this site. Make a mistake, everyone is eager to call you out but they aren't willing to provide the answer \$\endgroup\$ – Mike Seeds Jul 3 '19 at 16:14
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    \$\begingroup\$ It's a three year old question that already has correct answers. \$\endgroup\$ – JRE Jul 3 '19 at 16:15

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