Monday, June 13, 2016

100: Avoiding Solder
-- revised, again --

This is a recurring theme with me. I hate soldering, especially teenie-tiny, close together connections. So I keep looking for alternatives -- like screw-down connectors, circuit paint -- and just now "Wire Glue." See my posts 59, 93 and 96.

What's wrong with Wire Glue? a) it was hard to mix up (settled in the bottom), b) very weak "glue"; but here's the real problem:

Here's the test: I measure a known resistor. In my test below, a reading on a 220 Ohm resistor.
Big surprise, it reads .220k Ohms

And here's a reading for a heavy 3/4" line of Wire Glue (on inkjet printer paper):
Wow! 611 Ohms

This stuff should be called "liquid resistor." You will add resistance even if you glue 2 wires together with no apparent gap. PS: a foot long jumper wire reads .0.

Meanwhile, on the insulation front I have tried a couple glue/caulk products. 

Above, the glued wire-ends are both about 1mm apart and after 24 hours curing there is no current leaking between them. I made this test because I felt that red tube was the better insulator (they are the same). The main problem involves the tubes both drying out so that the screw top is plugged within a week or so. Also, the green tube goop sets harder.

More about glue:
My experience with "super glue": not an insulator. And about epoxy: probably not surprising is only a little stronger resistor than the above Wire Glue (and much stronger glue).

black tube 'contains metal'

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