Computing stuff tied to the physical world

Thermo Plug mismatch

In Hardware on Nov 18, 2010 at 00:01

The Thermo Plug was recently updated as a kit with a thermocouple for use as Reflow Controller, for example.

It uses screw terminals to connect the K-type thermocouple, because that wire can’t be soldered – I tried, really hard! Besides, you don’t want to add too many weird amalgamated cold metal junctions in this setup, which is all about the tiny voltage potential between different metals.

The whole thermocouple works nicely, but I goofed a bit on the connector: the screw terminal I got for this plug is slightly too big to fit on there in the intended position:

Dsc 2289

Yuck … two solutions:

  • solder it on anyway, and just ignore that tower-of-pisa effect…
  • solder it on the other way, and insert the thermocouple wires from the board side

Here’s how that will look:

Dsc 2290

Slightly odd, but it’ll work just fine of course.

Note that the back side of this screw terminal has two holes, but they cannot be used to insert wires, because those will end up too high and wouldn’t be held tight by the screws:

Dsc 2291

I’ll look around for a slimmer form-factor 3.5 mm screw terminal. If I can’t find any, then I’ll plan a board revision – but for now, it’ll have to do.

With a small nod to Mr. Murphy…

  1. Well Mr Murphy might have nipped in on his way back from the pub, but on the plus side those pictures are great :-)

  2. Couldn’t one just drill new holes lower on the back side if existing ones are too high?

    • Or as the holes are through plated, just mount the connector on the bottom, upsidedown :-)

      Not a pretty though.

  3. Ik heb het aan de onderkant dus op de kop gemonteerd geen enkel probleem

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