Author Topic: Yet another resistance decade box  (Read 52659 times)

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Offline krivx

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Re: Yet another resistance decade box
« Reply #50 on: June 07, 2016, 05:04:36 AM »
I'm interested - 2x sets (12) including resistors. The prices seem incredibly reasonable so 0.1% would be great if it can be managed.

Anyone scoped possible boxes/enclosures?

if I can get a set of these, I can try to do a laser cut style box using acrylic (or maybe wood for those that like that).

A design that could be run on itead/seeed's lasercutting service would be useful
 

Offline linux-works

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Re: Yet another resistance decade box
« Reply #51 on: June 07, 2016, 05:59:40 AM »
not sure what their limits are, but I tend to do pretty simple things that are designed in 2d and use a 'tabbed box' style of assembly.  nothing tricky about that.  its not glued, its floating and just screwed with standoffs and screws, so its open-able and fixable (the way I like it).
 

Offline meandeev

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Re: Yet another resistance decade box
« Reply #52 on: June 07, 2016, 06:14:40 AM »
I would like to have 2 sets (12 boards) including resistors an 4 additional boards.
 

Online bitseeker

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Re: Yet another resistance decade box
« Reply #53 on: June 07, 2016, 08:52:21 AM »
Very cool project. I don't yet have decade boxes for either resistance or capacitance, so both types are of interest to me.

Has there been confirmation on which switches to use with the MBB boards and is there a vendor that ships them to the US? The listing that was posted previously says they don't ship to the US.
Don't like TEA? We have COFFEE too.
 

Offline all_repair

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Re: Yet another resistance decade box
« Reply #54 on: June 07, 2016, 09:41:53 AM »
Count me in for 5 set with resistors.
 

Online PeterZ

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Re: Yet another resistance decade box
« Reply #55 on: June 10, 2016, 03:59:44 AM »
Enig MBB boards arrived. I can confirm they work fine.
Tested one with 10k resistors. The meaured 0 setting contact resistance was about 60mOhm (vs about 360mOhm with HAL board).

Regarding the switches: look for KM2 type 18x6mm decimal code thumbwheel switches. Found these on ebay:
http://www.ebay.com/itm/10-x-Black-Decimal-Code-Single-Unit-Thumbwheel-Pushwheel-Switches-18mm-x-6mm-KM2-/310827089552
 
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Offline BravoV

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Re: Yet another resistance decade box
« Reply #56 on: June 10, 2016, 04:11:28 AM »
So how many sets for each board ? 4 as above pictures ?

Just fyi, cheaper 18mm x 6mm KM2 alternative -> http://goo.gl/HgTVya  >:D
 
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Offline Fortran

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Re: Yet another resistance decade box
« Reply #57 on: June 10, 2016, 05:32:05 AM »
They will be sold individually. I've been counting a set as 6 boards though but you can buy whatever amount you want.

I bought these and they match:
http://www.ebay.com/itm/301726653090
 
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Offline linux-works

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Re: Yet another resistance decade box
« Reply #58 on: June 10, 2016, 03:19:49 PM »
put me down for a set of boards, too.

thx
 

Offline Fortran

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Re: Yet another resistance decade box
« Reply #59 on: June 10, 2016, 03:29:00 PM »
You're already on the list :)
 

Offline Zkronk

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Re: Yet another resistance decade box
« Reply #60 on: June 10, 2016, 06:43:51 PM »
I'm interested in buying a pack of 6 boards from you :)
 

Offline cucumbers

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Re: Yet another resistance decade box
« Reply #61 on: June 13, 2016, 10:57:51 AM »
Cool idea guys - and great timing, I just bought a bunch of eBay KM2s! Just joined the forum to say I'm interested in 2 sets of MBB boards + resistors, if they're still going.

Cheers!
 

Offline Back2Volts

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Re: Yet another resistance decade box
« Reply #62 on: June 13, 2016, 02:43:17 PM »
If still open, I am interested in 2 sets of MBB boards + resistors

 
 

Offline natman69

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Re: Yet another resistance decade box
« Reply #63 on: June 13, 2016, 05:09:42 PM »
Please, keep me informed!!!
I am interested in 2 sets of MBB boards + resistors 1% (or even better 0.1%).
Thank you.
 

Offline Fortran

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Re: Yet another resistance decade box
« Reply #64 on: June 13, 2016, 05:40:37 PM »
Everyone who has shown interest have been counted and there will be more then enough boards made.
Since PeterZ has confirmed that they work I'll be ordering later this week.
Once they arrive I'll start shipping them out.
 

Offline JohnPen

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Re: Yet another resistance decade box
« Reply #65 on: June 14, 2016, 06:24:52 PM »
Please can you add one set with resistors (1% is fine) for me.  Also can you advise the payment process you will be using.

Thanks,

John
 

Offline Fortran

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Re: Yet another resistance decade box
« Reply #66 on: June 14, 2016, 07:51:44 PM »
You've got a point there.
I'll be accepting PayPal.
 

Online bitseeker

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Re: Yet another resistance decade box
« Reply #67 on: June 15, 2016, 07:28:05 AM »
Thanks for the info on the model of switches to use.

Fortran, put me down for 1 set of MBB with 1% resistors to populate them.
Don't like TEA? We have COFFEE too.
 

Online bitseeker

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Re: Yet another resistance decade box
« Reply #68 on: June 15, 2016, 07:34:37 AM »
I tend to do pretty simple things that are designed in 2d and use a 'tabbed box' style of assembly. ...  its not glued, its floating and just screwed with standoffs and screws, so its open-able and fixable (the way I like it).

That sounds good. Binding posts on the short side?
Don't like TEA? We have COFFEE too.
 

Offline m100

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Re: Yet another resistance decade box
« Reply #69 on: June 15, 2016, 07:44:35 AM »
Please put me down for a set of MBB boards and resistors

Thanks!
 

Offline Fortran

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Re: Yet another resistance decade box
« Reply #70 on: June 15, 2016, 04:59:22 PM »
1000 boards have been ordered. That should be enough :)

They should arrive in a few weeks so I'm going on holiday in the meantime.
Resistors will be ordered so they arrive when I get back.
 

Offline natman69

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Re: Yet another resistance decade box
« Reply #71 on: June 15, 2016, 05:43:29 PM »
Thank you!   :-+
 

Online bitseeker

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Re: Yet another resistance decade box
« Reply #72 on: June 15, 2016, 05:44:59 PM »
Excellent. Have a wonderful holiday! :popcorn:
Don't like TEA? We have COFFEE too.
 

Offline linux-works

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Re: Yet another resistance decade box
« Reply #73 on: June 16, 2016, 02:47:33 AM »
I tend to do pretty simple things that are designed in 2d and use a 'tabbed box' style of assembly. ...  its not glued, its floating and just screwed with standoffs and screws, so its open-able and fixable (the way I like it).

That sounds good. Binding posts on the short side?

maybe people can throw together some images (3d mockups) of what they have in mind and we can find something that works for most of us.

I often start with this site

http://boxdesigner.connectionlab.org/

its pretty well known, by now, and its pretty simple.  enter the dimensions (outer, I believe) and it creates a pdf for you; you import that into your 2d editor (I use corel draw since its what our lasers at tech-shop mostly use) and you add whatever panel cut-out shapes and lettering you want.  edit some of the tab notches, if needed, do a dry run using cheap cardboard instead of plastic (I often will get something wrong and its nicer to waste cardboard instead of good material).

what I do beyond the standard box maker is to add a rim around the top and bottom plates and allow for pcb style standoffs to be used (long ones) to screw into top and bottom holes.  if the rim is extended beyond the box dimensions, then you need to edit the 'zipper' tabs into rectangles that the laser will cut; those become locking tabs that keep the sides from falling out.  this method is glue-less and depends on the standoffs being the interior height of the box and being screwed to the top and bottom.  here's a photo of one of mine, maybe it will be obvious what I was trying to decribe ;)



'top and bottom' are relative, if it makes sense to put the rails this way, whatever works for you.  one optimization is to use those standoffs as ways to secure rubber feet to the real bottom of the box.  rubber feet with holes and #6-32 screws work well and its easy to find 6-32 thread hex or round standoffs and either stack them in unison, all 4 corner posts; or get long ones to-size or cut them all to-size.  if they are threaded on one end and tapped on the other, they will stack and you can screw the rubber feet into the female side of the standoffs.  the top of that stack has exposed thread ends, and so I tend to use finished nice-looking acorn nuts and just hand tighten them.  it holds the box together, it lets me get inside easily, there is no need to glue things this way and each panel is replaceable since its just a bunch of panels.  if you get panels made, get extras made and when things get scratched or broken or old looking, refresh it with replacement panels ;)

anyway, that's what I do for DIY panels.  its cheap, it works well and while it has a bit of a strange look, its very practical in many ways and if its not meant to sit on a shelf and look pretty, its actually pretty enough for its job ;)
 
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Online PeterZ

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Re: Yet another resistance decade box
« Reply #74 on: June 18, 2016, 12:06:09 AM »
I was looking for a suitable box to accommodate the new longer MBB switches, found the Hammond 1591L at the local store.
Will do the job, there in enough space to mount the switches and binding posts on the top or any sides of the box.
 


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