Looking for 4mm PCB mount banana plugs - Page 1
Forum section: electronics / projects

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 21, 2019, 07:42:20 pm
content: I've spent a couple of evenings looking for 4mm PCB mount banana plugs with specific properties. I've been striking out, so maybe the forum can help. I'm looking for beryllium copper plugs, gold plated, longish and made by a somewhat decent manufacturer. I'd prefer barrel plugs, but other styles are feasible too. The mounting style should be thread, inner thread, rivet or something similar. That's not too critical.I've been able to find plugs with all the properties minus the gold plating or all the properties minus the beryllium copper or plugs that are too short. I could make do with either of the first two, but I can hardly imagine that specific combination not existing anywhere. However, I'm not finding them.

author: nsrmagazin
author_rank: Regular Contributor
timestamp: January 22, 2019, 08:00:41 am
content: You have a lot of requirements. I can offer you this:http://www.cfcbazar.com/products/newest-8pcs-4mm-plug-connector-gold-plated-musical-speaker-cable-wire-screw-banana-plug-connectorhttp://www.cfcbazar.com/products/1-pair-gold-plated-banana-plugs-couple-terminals-red-black-connector-amplifier-terminal-binding-post-banana-speaker-plug-jack/I don't know if its gold plated.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 22, 2019, 02:36:59 pm
content: Thanks! Unfortunately, I'm actually looking for a plug and not a socket. I've added an example picture of a plug. I don't think it's asking for a lot, considering all the various properties are readily available in various combinations. Finding them combined in one is proving to be illusive.

author: nsrmagazin
author_rank: Regular Contributor
timestamp: January 23, 2019, 12:24:39 am
content: Maybe this. But I took it from AliExpress directly and I don't know how good the quality is.http://s.click.aliexpress.com/e/iuYpsAy

author: mvs
author_rank: Frequent Contributor
timestamp: January 23, 2019, 11:02:38 am
content: Quote from: Mr. Scram on January 21, 2019, 07:42:20 pmDo you have some special reason to search for this unicorn? Good quality brass connectors should have barrel springs out of proper spring material like phosphor bronze, beryllium copper, etc.For wire termination i would recommend you SKS Hirschmann LAS N WS Au, but unfortunately they do not produce comparable banana plugs for PCB mount.

author: beanflying
author_rank: Super Contributor
timestamp: January 23, 2019, 11:32:55 am
content: Try this entire thread for some info but here is an RS number in this posthttps://www.eevblog.com/forum/metrology/copper-binding-post-shorting-straps-for-low-thermal-emf-alloytempering/msg1348405/#msg1348405

author: MiDi
author_rank: Frequent Contributor
timestamp: January 23, 2019, 03:57:49 pm
content: Probably the STÄUBLI 22.1005 or similar would come close to your desired unicorn.They could be soldered from both pcb sides easily and should be quite robust, but possibly you can add a custom thread to screw it - if that is main concern.They can be used as both plugs and jacks.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 23, 2019, 09:47:43 pm
content: Quote from: mvs on January 23, 2019, 11:02:38 amI'm mostly looking for what seems to be the optimal solution from a thermal EMF point of view. Brass connectors with beryllium spring barrels wouldn't be perfect but acceptable, but I haven't found those without them being too short or having nickel plating.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 23, 2019, 09:49:52 pm
content: Quote from: MiDi on January 23, 2019, 03:57:49 pmI had found those plugs as I've scoured the Stäubli catalogue a few times, but hadn't realised the metal part may possibly be ordered separately. That may be just the thing.Ah, I hadn't noticed they are brass before. Still, decent option.

author: timgiles
author_rank: Regular Contributor
timestamp: January 23, 2019, 10:28:37 pm
content: I tried the same search a few weeks ago. I ended up with the picture that you posted in reply 2. Ill likely order a set of 4 of those RS ones beanflying posted as well. I was hoping to find some a little longer - but as you state - it seems hard to find options that are far from the norm.

author: MiDi
author_rank: Frequent Contributor
timestamp: January 24, 2019, 06:20:14 am
content: Quote from: Mr. Scram on January 23, 2019, 09:49:52 pmThey are BeCu, response from Stäubli and they can be used for low thermal emf purpose.Take a look athttps://www.eevblog.com/forum/metrology/a-story-of-one-datron-wavetek-4708-(doktor-pytas-lab)/msg1952110/#msg1952110

author: nsrmagazin
author_rank: Regular Contributor
timestamp: January 24, 2019, 06:22:45 am
content: I updated the links in post #2 with something else I found, as the previous link in the site was removed.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 24, 2019, 06:34:02 am
content: Quote from: MiDi on January 24, 2019, 06:20:14 amYou asked Stäubli what the material is? Them having been tested to satisfaction is certainly encouraging.

author: MiDi
author_rank: Frequent Contributor
timestamp: January 24, 2019, 06:45:28 am
content: Yes, I asked Stäubli and user ap confirmed that they are ok thermal emf wise.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 24, 2019, 08:16:17 am
content: Quote from: MiDi on January 24, 2019, 06:45:28 amAwesome. Looks like I have an answer. Thank you!

author: MiDi
author_rank: Frequent Contributor
timestamp: January 24, 2019, 10:01:42 am
content: Back in October I made a prototype of a 4-wire short with this kind of plugs.The plugs are from ebay and without the solder nose, the manufacturer is unknown.Compared to mystandard 4-wire shortand a copper wire, I did not recognize any significant difference in offset voltage between them.

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 24, 2019, 11:50:09 am
content: Quote from: MiDi on January 24, 2019, 10:01:42 amMost excellent. This is a wealth of useful information. It looks like you soldered the plugs in, right?Can you tell us more about how you tested and compared the various versions against each other? Did you track both voltage and temperature over time?

author: MiDi
author_rank: Frequent Contributor
timestamp: January 24, 2019, 02:34:59 pm
content: It was just a quick comparison, after >5min settling for each I read the voltage.All 3 versions had around 1min settling time to final value.Test was done on a Keithley 196 6,5 DMM, so not a metrology grade comparison.The conclusion for me was that my standard 4-wire plug was good enough for the intended job.Edit:Yes, they are soldered from both sides

author: tooki
author_rank: Super Contributor
timestamp: January 24, 2019, 05:50:19 pm
content: Quote from: Mr. Scram on January 23, 2019, 09:49:52 pmSee also Stäubli SA400 series— screw on gold plated brass banana.Stäubli’s main catalog sucks. Here’s a data sheet:https://www.distrelec.ch/Web/Downloads/_t/ds/SA400_eng_ger_fre_tds.pdfThe Schützinger FK 1210 is almost identical.