Connecting wires to these terminals? - Page 1
Forum section: electronics / beginners

author: elroy
author_rank: Regular Contributor
timestamp: May 19, 2019, 07:01:17 am
content: I just bought an International Power IHBAA-40W linear power supply, and need to connect wires to the output posts:Are these posts designed to be soldered to? Or is there some slicker way to connect wires to them?

author: Zero999
author_rank: Super Contributor
timestamp: May 19, 2019, 07:25:42 am
content: Soldering could unsolder the posts from the board, if it's not done with a lot of care.How about wire wrap? If done properly, it can be more reliable than solder.

author: ataradov
author_rank: Super Contributor
timestamp: May 19, 2019, 07:29:20 am
content: I think those things are called turned terminals and are supposed to be soldered. There is no corresponding female connector.And I'm not sure what to do about desoldering from the PCB, but if you google "turned terminals", you will find manufacturers of those things, I bet they have recommendations.EDIT: Although Harwin has this text on their page "Turreted lugs available in 1, 2 and 3 wirewrap level versions.". So this implies that upper part is for wire wrap. But that seems strange without special tools.

author: johnkenyon
author_rank: Regular Contributor
timestamp: May 19, 2019, 07:55:52 am
content: Quote from: Zero999 on May 19, 2019, 07:25:42 amThe terminals may be press fit+soldered, or even rivetted+soldered - so soldering may not be that difficult for the average person.A picture of the track side of the PCB should reveal more.

author: tooki
author_rank: Super Contributor
timestamp: May 19, 2019, 08:24:12 am
content: Those look like solder turrets, in which case they’re designed to be soldered to. This video explains it:https://youtu.be/Mrhg5A1a1mUThe only thing that’s odd is that they’re hollow. Is it a 2-2.6mm or 4mm hole? If so, maybe they’re intended to accept banana or mini-banana plugs.

author: tooki
author_rank: Super Contributor
timestamp: May 19, 2019, 08:28:05 am
content: Quote from: ataradov on May 19, 2019, 07:29:20 amNo, that would imply that thelowerpart, invisible in this picture, is for wire wrap. (But this is practically guaranteed to not be a wire wrap version.)

author: MarkF
author_rank: Super Contributor
timestamp: May 19, 2019, 01:13:24 pm
content: Those are turret solder terminals. Solder your wires to them as shown in the video posted bytooki.They are NOT wire-wrap terminals. ALL wire-wrap terminals have SQUARE posts.The square edges are needed to bite into the wire in order to make a secure connection.

author: Zero999
author_rank: Super Contributor
timestamp: May 19, 2019, 01:41:10 pm
content: Quote from: MarkF on May 19, 2019, 01:13:24 pmYes, you're right. I was wrong. Doing a wire wrap on those terminals will be an absolute failure.

author: ArthurDent
author_rank: Super Contributor
timestamp: May 19, 2019, 02:18:18 pm
content: These post are designed for soldering wires to them and were pretty common. Heating the post up will not cause it to fall off because it is peened, riveted, or swaged, so it is firmly fixed on the circuit board. After being swaged to the board with the solder pad underneath which makes a good mechanical connection, the swaged head of the post is soldered to the pad to insure a good electrical connection as well.As the video shows, the wire you want to connect is bent around the top or the bottom turret and is soldered in place. Here is a cross section of the way the posts are fixed to the circuit board.Oh, and some of the hollow posts were used to insert a component lead up through the hollow post and the short end of the lead was bent over to hold it in place while it was being soldered. The photo I just took shows one of these from the backside of the board. The lead that goes into the hole in the metal post is the connection as there is no pad or run on this board.

author: elroy
author_rank: Regular Contributor
timestamp: May 19, 2019, 04:11:32 pm
content: Quote from: tooki on May 19, 2019, 08:24:12 amThanks! I remember watching the Pace soldering series a long time ago, but the details must have since slipped away.QuoteThey're not deep enough to hold onto a plug -- more like shallow indentations.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 19, 2019, 04:13:39 pm
content: There's always alligator clips and such.Tim

author: tkamiya
author_rank: Super Contributor
timestamp: May 20, 2019, 01:22:31 pm
content: I have several open frame linear power supplies with these posts. Without exception, they are soldered. On one, wire was inserted to the top hole and soldered. On the other, wire was weaved amount 3 terminals and soldered. On third, wire was soldered on side, rather poorly.

author: elroy
author_rank: Regular Contributor
timestamp: May 20, 2019, 05:57:33 pm
content: Quote from: tkamiya on May 20, 2019, 01:22:31 pmThanks.Incidentally, this is the first time I've bought an open-frame unit like this. I was interested to see that it is closed on four sides and open on two, has holes that appear to be about the size for mounting screws, and there is a good bit of a gap between a couple of adjacent panels.Is there a usual way to mount or enclose open-frame units like this?

author: tkamiya
author_rank: Super Contributor
timestamp: May 20, 2019, 07:25:05 pm
content: There should be holes on one or more sides. Be careful with transistors. They are usually electrically isolated from the frame. You don't want them touching something else and cause shorts.I mounted with transistor side down and used long stand-off.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 20, 2019, 07:55:55 pm
content: NASA-STD-8739.3 illustrates the use of and the soldering to those and related terminals, including inspection criteria.

author: Wendy_Preston
author_rank: Contributor
timestamp: May 24, 2019, 09:53:29 am
content: Quote from: ataradov on May 19, 2019, 07:29:20 amInteresting post - I also get MarkF and Zero999's comments on wirewrap posts should be square. This would be one of those legacy things that I don't have any evidence where the description came from in the first place. I've been here at Harwin for 24 years now - and even back at the start in Design I heard others call these "wirewrap" with 1, 2 or 3 levels. Hence, when it came to compiling the databases on the website, and the catalog, I used the terminology of wire wrap. I suspect it has come about because the wire is best curled round the post a bit before soldering (as you can see from that video that was posted) - not a true wrap, but a bit of a wrap. But yes, it does need to be soldered to achieve the gas-tight joint - wire alone is not going to cut it.I'm going to give this one some thought on how to improve Harwin's descriptions of these terminals, to modify or eliminate the phrase wire wrap - I'm always looking to try and improve the website where I can. Suggestions for better descriptions in addition to "turret terminals" will be welcomedYou've already all been helpful, thanks!

author: MarkF
author_rank: Super Contributor
timestamp: May 24, 2019, 02:14:00 pm
content: They are called "Turret Terminals" in this video and another video I saw from Pace.