Electronics > Beginners
Which end of these do I solder?
tooki:
--- Quote from: ggchab on November 10, 2019, 04:53:21 pm ---I think they are supposed to be used with female tulip pin headers. Try one and see which side fits best and solder the other one ;)
--- End quote ---
Tulip pin?? Is that autocorrect of “turned pin”? (Which we all already knew.)
But as magic just said, and I said a few days ago: if you stick the thick side of these male headers into a female turned socket, you WILL permanently damage the socket, and the socket will never again accept the thin (correct) side, nor actual ICs, correctly.
--- Quote from: Kirill V. on November 10, 2019, 06:41:34 pm ---Oh, someone mentioned the method of wiring invented by IBM for their mainframes. I very much doubt that in the 21st century someone will produce accessories for this. And these connectors have nothing to do with such a method.
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Are you talking about wire wrap? That wasn’t invented by IBM. It’s certainly quite rare today, but many parts are still made. Look at the full Mill-Max catalog, you’ll be surprised at how much wire wrap stuff they still make. And you can still get wire wrap tools.
tooki:
--- Quote from: kjr18 on November 10, 2019, 09:25:53 pm ---So flat side to the board. But what if I want to use them with female machined pin headers? Those longer pins are too loose in mine, and these shorter ones are much better fit for those.
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Did you insert the thick side of the male header into the female turned header, even just once? If so, the female header is ruined and must be replaced.
Kirill V.:
--- Quote ---Are you talking about wire wrap?
--- End quote ---
Yes, I talked about it. As far as I know, IBM used it. For some reason I thought they invented it.
Wire wrapping was used in the USSR and books were written about it. I read these books.
tooki:
--- Quote from: Kirill V. on November 11, 2019, 03:55:53 pm ---
--- Quote ---Are you talking about wire wrap?
--- End quote ---
Yes, I talked about it. As far as I know, IBM used it. For some reason I thought they invented it.
Wire wrapping was used in the USSR and books were written about it. I read these books.
--- End quote ---
IBM definitely used it, but it was invented many years earlier. Wiki says Bell invented it.
DBecker:
Wire wrapping was used in telephone central offices long before it was used for the general purpose electronics.
I used wire wrapping in the early 1980s. By then it was mature, with a body of knowledge from decades of experience. There was a large, detailed set of rules to make reliable connections. The pin and wire plating, wire gauge, insulation type and thickness, etc were precisely specified and standardized. If you followed the specified techniques, the result would be very reliable. Not quick, not easy, not easy to debug, not inexpensive, but very reliable.
For my hobby projects I had one of the inexpensive double-ended hand wrap tools. One end was for unwrapping, the other for wrapping, with a wire stripping groove in the middle. I think that most hobbyists of the era had that tool and a spool of the blue insulated silver-plated 30 AWG wire. A hobby alternative was a soft insulation wire intended to be used without stripping, with the square post cutting through the insulation, but that wasn't considered as reliable.
The setup I used for large boards was typical for commercial prototyping. There was wire storage, and the X-Y assembly machine. Wire storage was a panel with storage tubes for pre-cut, pre-stripped wires. Each tube held a different length, and the pre-cut wires had insulation color coded for their length. (Hmmm, DigiKey still sells the wire packs. $9.50 for 50 pieces of the shortest length, which is about what it cost "back in the day". For a typical 2000 wire board that's $400 for just the wire!) The assembly frame had two stepper motors that moved an L-shaped bracket. A tap on a foot pedal moved the bracket to the origin location and flashed the wire length on a LED display. A line-powered wrap tool ($$$) was used to spin the wire down. A second tap moved the bracket to the destination, which was always lower and/or left. That allowed for "Manhattan routing" (e.g. always horizontal then vertical) of the wire while the guide was slewing to the new location, and reduced the chance of damage from tapping the pedal a little early.
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