Reply To: Scalefour Society R/C kit harness

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John Cutler

    3.        Micron 2-pin 1.27mm pitch socket connectors SKU 53184. These have 2 pins at one end and 2 sockets at t’other. They come in packs of 5; you only need 1, for the switch connector.

    4.       A pinpoint soldering iron for electronics work. I recommend an iron with a flexible silicone cable for this tiny application. I bought a new bit for my Antex 25W iron.

    5.       c0.5mm solder wire for electronics soldering. I may have made a mistake in buying cheap lead-based solder for this job; I suggest investing in top quality electronics solder.

    6.       Araldite epoxy or other slow-setting glue.

    7.       0.45mm and/or 30 AWG wires, unless you can trail the solder between the perfboard sockets.

    8.       Some paper and/or Blu-tak and maybe tape to use as soldering blocks.

    9.       A junior hacksaw to cut the perfboard to size.

    10.       A magnifying glass on a stand.

    11.       A circuit tester.

    12.   Three pairs of hands.

    13.   A swear box.

    The Mark 2 version employs Micron connectors glued to the perforated board (refer to the wiring diagram below). Do not use a quick-setting glue like cyanoacrylate as there is a danger of misconnecting the tiny pins at the first attempt (how do I know?!). I used Araldite. I recommend placing small pieces of card (cereal packet) between the Micron connectors to act as spacers otherwise they will tend to end up, like mine, being too close together. Note the S4 Soc connectors are thicker than the Micron ones due to the use of a heat-shrink wrap; I ended up removing some of that otherwise the pin connections were too awkward. If you can afford the extra space (another 1.27mm on the board width), leave 2 perfboard sockets unused between the plugs rather than the one I left unused (shown on the wiring diagram below). Make sure the pins protrude on the reverse of the perfboard; they do not poke out much. After the glue has cured, soldered connections can be made at the back of the board; between the protruding Micron pins. I used 0.45mm and 30AWG wires. Refer to the diagram below. A combination of Blu-tak and bits of taped paper were used to block possible solder misconnections; you need an exceptionally steady hand for the iron not to drift or wobble a tiny bit.  Test at every connection. Then test again for possible short circuits.