Neat!! Appreciate the detail and random test-reply! I'm sure I can put this to use.
On Sat, Apr 10, 2021 at 1:38 AM Brian K. White <[email protected]> wrote: > On 4/9/21 11:22 PM, Bert Put wrote: > > test? > > > > Many, many years ago on a distant shore > Men did gather secretly beyond a hidden door > > What's more appropriate for soldering than heavy metal and songs about > hell? It's literally lead, and it's literally hot enough to melt, and > there's even noxious fumes. Soldering is metal af. :) > > Got a technique pretty much down for making dip legs on pcbs out of > plain gold plated brass jewelry wire. > > > https://photos.app.goo.gl/mQnsaH5LVoQW2RdJ6 > > > Stick a dip-28 machined round socket in a breadboard. > > Cover the top with a piece of painters tape. I'm using green Frog tape, > but anything like masking tape or blue painters tape will work the same. > > Set the pcb on top of that. > > Poke the brass wire down through the top of the pcb in one corner via, > punch through the tape, into the socket, and bottom it out in the socket. > > Snip the wire flush with the top of the pcb. > > Repeat for the opposite corner. > > Add flux and solder those two legs. You only need to touch the heat to > the top, The flux will tak ethe solder down into the via and the tape > will keep the solder from going down into the socket. 2 or 3 seconds is > generally plenty. > > Then repeat just the poke & cut steps for all other legs. > > Then solder all legs. > > > The wire you want is 26 gauge gold-filled brass, half-hard. > > "gold filled" is like gold plated but way more gold than we actually > need, but no one seems to sell merely gold plated wire, just bare brass > or gold-filled. > > 26 gauge is thin enough to fit into machined round sockets and not even > theoretically harm any sockets by stretching them out like ordinary > square pins do, yet strong enough to inserted into connectors without > bending. Prices vary pretty widely for the same product, so you should > shop around... > > These are some that I actually purchased and tried and they work well: > > This is probably the most economical I've found so far: > > https://www.wirejewelry.com/round-red-brass-wire/26_Gauge_Round_Half_Hard_Red_Brass_Wire-14549-901.html > > https://www.amazon.com/gp/product/B07HCMYWGN?psc=1 > > > https://www.ebay.com/itm/Red-Brass-Wire-Round-Half-Round-Square-14-16-18-20-21-22-24-26-28-Gauge/123161530578?var=423571461737 > > > https://www.ebay.com/itm/26ga-Gold-plated-copper-round-wire-4mm-015-create-wire-wrapped-jewelry-pw023/203158831071 > > > This one (below) does NOT work well, but only because it's thinner than > 26 gauge despite saying 26 gauge. Perhaps 24 gauge from the same > supplier would be perfect. Even this does work, just the legs are a bit > thin and weak. They still do manage to insert into even fairly stiff > sockets without folding, so really, you could use this just fine. And > the thin/weakness of the wire does have a benefit that when you bend the > legs accidentally from handling the finished object, you can just bend > them back and they don't break off. > https://www.amazon.com/gp/product/B07S9JFK2V > > This one works but is a bit softer than ideal. It does say copper not > brass, so it makes sense. However, "dat price tho"... Stiffer brass is > better, but this does actually work. It's just a little more delicate > about punching through the painters tape. The legs insert into sockets > just fine. > > https://www.ebay.com/itm/26ga-Gold-plated-copper-round-wire-4mm-015-create-wire-wrapped-jewelry-pw023/203158831071 > > > And you want to avoid any that say "tarnish resistant" or "gold color", > because they will actually be aluminum wire with an enamel coating. > > Example of what at avoid: > https://www.amazon.com/dp/B077ZP7H4C > > Exmple of what to get (I didn't actually buy this one, it's just an > example that meets the criteria): > https://www.amazon.com/dp/B06ZZ83F5N > > > The advantage? The point of all this? Actual micro-pins from MillMax or > Keystone are around $0.10 per pin in small quantities and don't go down > very much in larger quantities. Punched sheet leadframe pins from > TE-Connectivity are also about $0.10 per pin, and those are only tin > plated not gold. > > This method uses under 6.0mm of wire per pin (I measured 5.88mm average > over several pins). You can get 15,000mm of gold plated wire for $3 plus > $3.50 shipping from the ebay one above (49feet $2.95) That's 2,500 legs > for $0.0026 per leg, or $0.07 for an entire 28-pin pcb. > > And the time/care/effort needed to do the job is actually about the same > for all 3 options. > > Hey gold & brass... more heavy metal. > > (The first two lines in this email are the first two lines in the most > ridiculously over the top caricature of a metal tune I ever heard. So is > the album art. Metal Church by Metal Church.) > > This concludes this test of the m100 list broadcast system. > > -- > bkw > -- -- Brad Grier
