Author Topic: Hookup wire  (Read 5009 times)

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Offline KL27x

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Re: Hookup wire
« Reply #25 on: June 10, 2019, 08:41:54 pm »
^No Marge. I told you, I have spare couch feet here, somewhere. You didn't have to buy them. Ahh, fine. Well, give me those leftover couch feet and I'll start a new coffee can.
 
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Offline IDEngineer

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Re: Hookup wire
« Reply #26 on: June 10, 2019, 10:28:47 pm »
When you are looking for reliability you can always "glue" it down with some solder-able conformal coat removes issues with vibration.
Super glue works well for this.
Even better in my experience is the cyanoacrylate (super glue) that is UV cured. I find regular superglue that isn't squished between two objects takes a long time to cure. But for applications like this those little UV pens are amazing. Can be purchased locally for several dollars each, or eBay for a buck or two if you're willing to wait for Chinese shipping. You can put a "drop" in a certain place, run the wire through it, illuminate it for 4-5 seconds, and it will cure in that same shape while holding the (now) embedded wire in place. We keep a bunch of these around for all sorts of purposes. Extremely useful.

Nothing special about this one, just the first that came up on eBay. Home Depot and other hardware stores stock them too.



https://www.ebay.com/itm/Quick-5-Second-Fix-UV-Light-Repair-Tool-Glue-Refill-Liquid-DIY-TOOL-Welding-Kit/163048072567?hash=item25f66c2577:m:m47NcPPjPE4LQV0kgyXLmPg
 
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Offline fixit7Topic starter

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Re: Hookup wire
« Reply #27 on: June 10, 2019, 10:54:20 pm »
When you are looking for reliability you can always "glue" it down with some solder-able conformal coat removes issues with vibration.
Super glue works well for this.
Even better in my experience is the cyanoacrylate (super glue) that is UV cured. I find regular superglue that isn't squished between two objects takes a long time to cure. But for applications like this those little UV pens are amazing. Can be purchased locally for several dollars each, or eBay for a buck or two if you're willing to wait for Chinese shipping. You can put a "drop" in a certain place, run the wire through it, illuminate it for 4-5 seconds, and it will cure in that same shape while holding the (now) embedded wire in place. We keep a bunch of these around for all sorts of purposes. Extremely useful.

Nothing special about this one, just the first that came up on eBay. Home Depot and other hardware stores stock them too.



https://www.ebay.com/itm/Quick-5-Second-Fix-UV-Light-Repair-Tool-Glue-Refill-Liquid-DIY-TOOL-Welding-Kit/163048072567?hash=item25f66c2577:m:m47NcPPjPE4LQV0kgyXLmPg

You are handy as a pocket.
 

Offline KL27x

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Re: Hookup wire
« Reply #28 on: June 10, 2019, 11:22:22 pm »
Quote
Even better in my experience is the cyanoacrylate (super glue) that is UV cured. I find regular superglue that isn't squished between two objects takes a long time to cure.
You don't need special glue. All you have to do is sprinkle some baking soda onto the glue.
 

Offline IDEngineer

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Re: Hookup wire
« Reply #29 on: June 10, 2019, 11:33:02 pm »
Quote
Even better in my experience is the cyanoacrylate (super glue) that is UV cured. I find regular superglue that isn't squished between two objects takes a long time to cure.
You don't need special glue. All you have to do is sprinkle some baking soda onto the glue.
Interesting! But UV light cleans up way easier than baking soda when I'm done.  :)
 

Online MarkF

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Re: Hookup wire
« Reply #30 on: June 11, 2019, 12:40:38 am »
Are we really talking about how to make a protoboard a permanent fixture?

The key word here:  "prototype"

Is this thing going into space?  Get a PCB made and put it into an enclosure!
Or just put some feet on the board.

Unless you are a bull in a china store, a little attention in handling the board should last some time.

   
 

Offline fixit7Topic starter

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Re: Hookup wire
« Reply #31 on: June 11, 2019, 03:08:33 am »
Curious as to why there are 2 resistors on this side?

Is there a pic of the other side?

Does this show wire wrapping?

 

Online MarkF

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Re: Hookup wire
« Reply #32 on: June 11, 2019, 05:47:12 am »
Curious as to why there are 2 resistors on this side?

Is there a pic of the other side?

Does this show wire wrapping?

The resistors are a modification to the filters for the encoder pins.  To reduce noise and contact bounce.

Yes.  This is a very small example of wire-wrapping.  Except for the discrete components.
Notice for stain relief, I ran the wire down from the top in the same hole as the component pin, soldered and then ran the wire to the bottom side through the hole next to it.  Essentially, creating a "J" hook.

This is a 1Hz to 10MHz function generator based on an AD9834 DDS and a PIC18F2550 MCU.

   

Edit- 
   More detail here:  https://www.eevblog.com/forum/beginners/diy-function-generator/msg1115550/#msg1115550
« Last Edit: June 11, 2019, 05:56:17 am by MarkF »
 
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Online MarkF

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Re: Hookup wire
« Reply #33 on: June 12, 2019, 10:07:47 am »
Here is a restoration of a DEC PDP-8 computer.
All the backplanes are wire wrapped.  It can be a real rat's nest.
   https://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/log2013.shtml



And here is a closeup example I found online.  Modified wrap.

   

F.Y.I. 
  There are two different wire wrap tools. 
  The "Standard" wrap just wraps the bare wire around the post. 
  The "Modified" wrap wraps one loop of the insulation around the post. 
  Wrapping the insulation around the post helps prevent shorts to an adjacent post or wire. 

  There are also different length posts.  Typically, 2 and 3 layer posts.
  The number of layers being the number of wires you can put on one post.
 

Offline David Hess

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Re: Hookup wire
« Reply #34 on: June 12, 2019, 07:54:10 pm »
And here is a closeup example I found online.  Modified wrap.

...

There are also different length posts.  Typically, 2 and 3 layer posts.
The number of layers being the number of wires you can put on one post.

Also note that wire wrap posts are square and not round.  The corners of the square posts bite into the wire and form a gas tight seal.  When you unwrap a wire, you can feel where the metal post and wire melded together at the sharp corners.

If a round post was used, tarnish between the wire and post can eventually make for an unreliable connections.  If you must wirewrap a round post like a component lead, it should be lightly soldered as well.
 
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