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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
mini banana's?
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23isgood



Joined: Nov 18, 2006
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PostPosted: Sat Feb 16, 2008 1:38 pm    Post subject: mini banana's?
Subject description: where to order in the US
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Well im going to start ordering parts for my Luneta. I dont have any banana systems at all, so I was wondering where is a good place to order some mini banana plugs and jacks? How about the cables for these? What would be the required gauge? I cant wait, for my Luneta. It will be a while before I have something up and running, but im excited.

thanks
pete

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fluxmonkey



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PostPosted: Sat Feb 16, 2008 3:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Don Lancaster had mini-banana stuff in his online store forever... check http://stores.ebay.com/Synergetics-Abeja

b
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23isgood



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PostPosted: Sun Feb 17, 2008 12:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not a bad link, but he doesn't have mini banana's. After doing some searching, I really could not find these. It seems that I may just have to go with the standard banana style. I really want to build my Lunetta into a box that is as small as possible, thats why I want the mini banana's. Here are a few links I found for standard banana's,

http://shop.vetcosurplus.com/catalog/product_info.php?products_id=1032

http://www.futurlec.com/Banana-BananaPlugs.shtml

http://www.testpath.com/Categories/Banana-Plug-Patch-Cords-PVC-Stacking-1835.htm

The Pomona cables are nice but expensive.

pete

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mosc
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PostPosted: Sun Feb 17, 2008 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's nice to have a few of those nice Pomona cables, but most of the cables can be non-stackable home-made cheapies.
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loss1234



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PostPosted: Sun Feb 17, 2008 7:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

shoot i wish i could find some mini bananas

i found the mini bannana jacks BUT not plugs at electronic goldmine

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bugbrand



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PostPosted: Mon Feb 18, 2008 2:42 am    Post subject: Reply with quote  Mark this post and the followings unread

It *may* be possible to order from Rapid now (they've changed their minimum order for outside UK) - their prices are generally pretty darn good and they offer them in a nice selection of colours (futurlec only do red and black)

Sockets
Plugs
And cheaper non-RoHS plugs

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loss1234



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PostPosted: Mon Feb 18, 2008 5:56 am    Post subject: Reply with quote  Mark this post and the followings unread

now i am pissed...those look awesome but i cant find them ANYWHERE else...and futurlec only seems to have the big banana plugs not the 2mm.

boo

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fluxmonkey



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PostPosted: Mon Feb 18, 2008 6:54 am    Post subject: Reply with quote  Mark this post and the followings unread

if you're having trouble sourcing, you might want to re-think your choice. hard to find, non-standard... i doubt the space savings would offset these downsides.

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loss1234



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PostPosted: Mon Feb 18, 2008 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

yeah good point

anybody know where to get cheap pre-made banana cables? i have had real trouble with the plugs from radios shack (the kind where you solder the wire to the little hole toward the tip....maybe i am using the wrong type of wire ( I USED 24 AWG STRANDED)

any tips on making or sourcing the banana cables?


thanks

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RF



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PostPosted: Mon Feb 18, 2008 8:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Some sort of Test lead wire would be my first choice - but it's probably overkill....*

Here's the first thing that came up on a Google search - I'm sure you can find it for less $$, and probably in a smaller gauge.

http://www.bulkwire.com/product.asp?ProdID=21718&CtgID=6578

bruce

* (I have overkill tendancies. (Witness my 1/4 inch jacks and 1/8 aluminum panels (It's a deeply ingrained personality issue. )))
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toppobrillo



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PostPosted: Mon Feb 18, 2008 2:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

here they are, they're called "tip plugs/ jacks" at mouser, for about the same price as banana types

http://www.mouser.com/catalog/633/1097.pdf

josh
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RF



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PostPosted: Mon Feb 18, 2008 3:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the pointer Josh!
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Uncle Krunkus
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PostPosted: Mon Feb 18, 2008 5:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can get black and red 2mm banana sockets and plugs from Dick Smith, but I'm only gonna use the sockets. For plugs, I'm just gonna solder a couple of 2mm nails to a variety of wire sizes/colours, and cover the joint with a bit of heatshrink. This will afford just as much (probably more) strain relief as the shitty little plugs would. (I'd have to re-inforce them with heatshrink anyway) And it will save some money as well.
Some extra colours in the way of sockets would be nice, but black-in and red-out will do fine for now.

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frijitz



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PostPosted: Mon Feb 18, 2008 9:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

topp wrote:
here they are, they're called "tip plugs/ jacks" at mouser, for about the same price as banana types

http://www.mouser.com/catalog/633/1097.pdf

josh

Ummm ... those are good, but they are not the same as miniature bananas.

Very Happy

Ian
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toppobrillo



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PostPosted: Mon Feb 18, 2008 11:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

they're not? i know the plugs aren't exactly 'bananas', more like pins.. i guess i have never seen these 2mm bananas. do they make stackable plugs?

edit: here are some minis on the previous page, see H

http://www.mouser.com/catalog/633/1096.pdf

hmm those tip plugs/jacks look really nice though.

josh
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fluxmonkey



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PostPosted: Tue Feb 19, 2008 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread

another option would be the ciat lonbard/peter blasser method of brass pegs and alligator clips:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

seriously
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23isgood



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PostPosted: Tue Feb 19, 2008 11:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Great searching guys! The Mouser parts look nice but way too expensive. There is always a catch. I really like those really tiny ones.
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danielwarner



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PostPosted: Tue Feb 19, 2008 2:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

You could use 2.5mm (3/32") jacks and plugs, that might not be cost effective though, haven't looked into sourcing them
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RF



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PostPosted: Tue Feb 19, 2008 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

topp wrote:
here they are, they're called "tip plugs/ jacks" at mouser, for about the same price as banana types
http://www.mouser.com/catalog/633/1097.pdf
josh


FWIW - I really like these pin types of plugs/jacks. Several years ago I scavanged some from a few pieces of old test equipment for use on another project...

However - You can't stack 'em, they don't work with anything else in my kit (or most anyone elses), they are no cheaper than Bananna's, have no smaller footprint than Bananna's, they are harder to find....

What the heck - I'll probably use them anyway Laughing
bruce
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goldenechos



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PostPosted: Wed Feb 20, 2008 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

If you are going to go for the mini bananas, I would advise getting the sockets and plugs from the same manufacturer.

I purchased a lot of several hundred EF Johnson mini bananas from ebay.
I then sourced some plugs from Ponoma, also sold as mini banana. these would not fit those sockets. It took me 3 tries to finds a plug that worked.
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williamsharkey



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PostPosted: Fri Feb 22, 2008 7:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Has anyone ever made specialty cables with circuit components inside of the cable?

For example: A cable with a diode in it?


Or maybe you are ideologically oppose to this - "a cable should do nothing, only modules affect sound"
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williamsharkey



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PostPosted: Fri Feb 22, 2008 8:06 am    Post subject: Reply with quote  Mark this post and the followings unread

What about small Neodymium Disc Magnets, has anyone made a cable system with these?

If it worked, it would be cool because it would be flush to front panel, like this:
Code:


VCA
-----------+
           |
           |
           |
           |
           - insulator
    magnet[] 
           - insulator
           |
           |            []=======cable======[]
           -
  VCA OUT [][]==\\
           -     ||
           |     ||
           |     ||
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-----------+     ||
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OSCILLATOR       ||
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           -     ||
   freq   [][]\  ||
           -  \\_/|
           |   \_/
           |
-----------+

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bugbrand



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PostPosted: Fri Feb 22, 2008 8:17 am    Post subject: Reply with quote  Mark this post and the followings unread

That's a really interesting idea!
You could put a mini-magnet inside something like a grommet (y'know - those little rubber rings you pass cables through panels with)
I could imagine, perhaps though, that it may be hard to solder onto the rear-side of the magnet (and I think you'd want to do that, no?)

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williamsharkey



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PostPosted: Fri Feb 22, 2008 1:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

"I could imagine, perhaps though, that it may be hard to solder onto the rear-side of the magnet (and I think you'd want to do that, no?)"

Yeah, the texture on a neo magnet is very slick. And i wonder if solder responds to the magnetic field?

I'm gonna try to obtain some magnets and do experiments on them.
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Blue Hell
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PostPosted: Fri Feb 22, 2008 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

You could just use a small iron or silver disc that you solder the wire on. The disc will stick to the magnet, and when it's good enough for a cable connection it's probably good enough for the connection on the other side as well Very Happy

Beware though that not every magnetic material will conduct electricity, ferrites are insulators, well the ferrite rods used for AM radio antennas and the ferrite shells used for coils are. So best try a sample first.

I see no reason to worry about a bad influence of magnetism on solder, I'd think the forces would be way to low to cause mobility of possible magnetic materials (like silver) in the solder mix.

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