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Wire connection point to point?

KWXYZ

Jan 25, 2021
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Sorry, for the Newbie Question?
I know I can use legs of a Cap or Resistor, but what are these called?
and do they come in standard sizes?

wires.jpeg

https://i.imgur.com/QDF3Q39.jpg

Thanks

Moderators note : inserted image
 
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dave9

Mar 5, 2017
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They're usually just referred to as jumper, hookup, or bus wire, typical solid copper core that's tin plated. Sometimes it's called wire wrapping wire or protoboard wire. You can buy kits in different pre-cut lengths but that's really expensive compared to just getting a roll of wire in the gauge you need (for current capacity required) and cutting and bending to the length you need.

As usual, you will end up paying a premium for a short length of wire compared to buying hundreds to thousands of feet at a time. I mean in wire gauges similar to what you pictured, then with lower gauges, less length, similar weight.
https://www.ebay.com/itm/22-AWG-Gau...uss-Wire-25-Length-0-0254-Silver/372103153169

For a one-off project, if I really wanted to avoid making a double sided board, I'd just grab some scrap ethernet cable and tin that, or magnet wire, bell wire, etc. in whatever gauge was needed.
 
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KWXYZ

Jan 25, 2021
16
Joined
Jan 25, 2021
Messages
16
They're usually just referred to as jumper, hookup, or bus wire, typical solid copper core that's tin plated. Sometimes it's called wire wrapping wire or protoboard wire. You can buy kits in different pre-cut lengths but that's really expensive compared to just getting a roll of wire in the gauge you need (for current capacity required) and cutting and bending to the length you need.

As usual, you will end up paying a premium for a short length of wire compared to buying hundreds to thousands of feet at a time. I mean in wire gauges similar to what you pictured, then with lower gauges, less length, similar weight.
https://www.ebay.com/itm/22-AWG-Gau...uss-Wire-25-Length-0-0254-Silver/372103153169

For a one-off project, if I really wanted to avoid making a double sided board, I'd just grab some scrap ethernet cable and tin that, or magnet wire, bell wire, etc. in whatever gauge was needed.

Thanks, on it's way, Now I know what they're called.
 

AnalogKid

Jun 10, 2015
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Those are jumper wires, solid copper wire that is solder coated or tin plated. For a high-volume consumer electronics product like a VCR (back when), these were stitched into the board by an automated machine with a large reel of the wire. It is a low-cost alternative to a double-sided, plated-through hole pc board.

First, a robot places glue dots at the location of every surface-mount component on the bottom side. Then those components are placed by another robot. Then the top side through-hole components are placed. Then the bottom side is wave soldered, soldering both the SMT and PTH components.

ak
 

Kabelsalat

Jul 5, 2011
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There is one little confusing thing (English) - The use of same word for this kind of jumper and the kind of detachable jumper you place onto a couple of pins to make a short. Locally - I'm used to name those with different terms.
 

HellasTechn

Apr 14, 2013
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There is one little confusing thing (English) - The use of same word for this kind of jumper and the kind of detachable jumper you place onto a couple of pins to make a short. Locally - I'm used to name those with different terms.

Yes, still calling them the same is Okay since they achieve the exact same purpose, which is to galvanically connect two points, only with slightly different way.
 

AnalogKid

Jun 10, 2015
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There is one little confusing thing (English) - The use of same word for this kind of jumper and the kind of detachable jumper you place onto a couple of pins to make a short.
Pedantically, the two-pin header on the pc board is a plug. We always used a P reference designator for them. We used a W designator for an installed wire. On some boards we use 0 ohm resistors, and those were designated with an R.

ak
 

Minder

Apr 24, 2015
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Sorry, for the Newbie Question?
I know I can use legs of a Cap or Resistor, but what are these called?
and do they come in standard sizes?

Jumpers. If permanent or final board version, the tinned variety is preferred, but for general/varying lengths of jumper wires using bread-board or Strip (Vero) board, I use a piece of single strand telephone cable, (2 to 4 pair), leave the insulation on for the longer versions.
Home depot etc has it by the foot.
M.
 

AnalogKid

Jun 10, 2015
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Double-versus-single sided is, first of all, a description of the bare pc board with no components. This goes back to when there was a huge cost difference between the two. Separate from that is double-sided versus single-sided assembly, something that became a thing with surface-mount technology (SMT). There is a big difference between hand-soldering a couple of resistors or capacitors on the bottom side of a board, and having a robot place a hundred components or more. The image in post #1 is a single-sided board with double-sided assembly. Based on a cost analysis of both the production and long-term reliability of the assembly, someone decided that a bunch of jumpers was more cost-effective than the second copper layer.

A significant issue is that top-side SMT components can be soldered only with a reflow oven, which melts ordinary electrolytic capacitors and connector bodies, and placing a few hundred components on the top side as through-hole (PTH) parts, even with a robot, is a big cost increase. The parts are bigger, which increases the bare board size, and more expensive than their SMT alternatives.

When you're going to produce 100,000 of something, there are a *ton* of tradeoffs to consider. For example, PTH components have shock absorbers and compliant mountings built-in - they're called the leads. Flexing a pc board assembly is bad, but there are degrees. An all-PTH board can be flexed without damage much more than an all-SMT board. A couple of our MIL customers banned SMT ceramic caps above a certain size because of cracking during shock testing.

ak
 
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davenn

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Sep 5, 2009
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In my mind I still count it as a double sided board, cause its got jumpers on the bottom


it's a SINGLE sided board, there is NO pcb tracks on the top side !! a double sided board has tracks on BOTH sides.



If this counts as single sided I would never use double sided because I think it is never necessary,


You obviously dont understand what the jumpers are for. So here it is. live and learn ;)

When tracks on the lower side need to cross one another, from one part of the board to another, Jumpers are needed to "bridge over those tracks


I've done a fair bit of thinking on the topic.


Obviously not ;) :)
 

Minder

Apr 24, 2015
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As per Davenn, the single/double side refers to the presence of foil/tracks, on a "single" side or a "Double" side.
The jumpers are considered just another device, as a 0.0 ohm resistor etc would be.
M.
 

AnalogKid

Jun 10, 2015
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you can lay out anything discrete with one set of tracks and one set of jumpers
No, you can't. Your naivete is dripping. In a word - backplanes.

A VPX backplane can distribute a 6 GHz signal per pin pair (each signal is a differential pair). That is squarely in the middle of the microwave C band. Normal connector pins (and plastic) do not function well at these speeds, so the connector is a stackup of multiple thin pc board wafers. Each has signal connections routed with micro-stripline techniques.

The pin density is large. In the same space as 200 pins (signal, power, and ground) on a VME backplane, a 6U VPX board has over 700 signal contacts, plus additional contacts for multi-amperes of power supply currents at various voltages. In an optimizing pass for one backplane, I was able to reduce the layer count from 30 layers to 24 layers.

Fun fact: at these frequencies, the length of a via from one layer to another has a measurable effect on signal integrity. You can't just run a via through all layers and connect to it anywhere in the middle. If you do that, the unused parts of the via form stubs that cause reflections. You have to use a fab technique called back-drilling. Tricky and expensive.

ak
 
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