Hot answers tagged

26

Zierick manufacture a range of surface mount PCB spacers. Part number 1258-236-0 is 6mm long.


23

Think about it mechanically - you have a straight row of pins and you insert them in slightly loose fitting holes (all in a line). Even if you hold them in place - can you be sure that one of the pins isn't fractionally bent in one direction different to the others. Think about this for a 3 pin header: - Clearly the pin in the middle isn't touching the ...


19

This is to identify which pin is "pin 1". In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off. If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, ...


16

Generously tin a piece of wire Insert the wire into the socket with the stuck pin Reflow the solder to join the pin to the wire Use the wire to extract the pin. Be careful not to solder the pin into the socket!


15

The holes in the PC board are somewhat larger than the pins on the header so that you can easily insert the header. The normal headers are intended to be soldered into the board. Because of the loose fit of the pins in the holes, simply placing the header in the board without soldering will not ensure a good connection. There are "press fit" headers ...


14

Use an inverted brass flat head machine screw. These will solder easily and depending the mechanical strength you want the part can be selected from a range with various head sizes. Some possible candidate machine screws would be these part numbers from McMaster-Carr. Length of 6mm 99658A524 M3 $9.68/100 96686A150 M2 $10.58/50 96686A210 M3 $7.94/50 ...


14

SparkFun has an Eagle library that has pads for single and dual row 0.1" headers from 1 to 40 pins. Here is one of several 1x03 headers (single row, three pins): The holes have a 40 mil diameter. The yellow square posts, which are for reference only, are drawn with 20 mil sides instead of the standard 25 mils, but expanding the sides out to 25 mils and ...


13

$0.02 worth The metal part of the female connector (in which the wire is stuck) looks like a tuning fork. You don't see the fork, because it's surrounded by the black plastic. The fork should be in-plane with the connector. Try to make a hole in the plastic on the side of the connector. Perhaps, you could make the hole with a hot nail or a dremmel. The ...


11

Board to board connectors are what you're looking for. SMT of course


10

You can split your design into a hierarchy (e.g. multiple pages), then have local nets to each page and also global nets. You can also use specific page to page connectors (so the page symbol is like a component you can drop into another page (over on the right hand icon set you will see an icon labelled "Place hierarchical pin in sheet" and another named "...


9

In this answer I discussed using these spring connectors to connect boards: Available in lengths up to 30 contacts, 1.27 mm or 2.54 mm pitch, so that a 10 contacts version doesn't have to be wider than 12.7 mm. Like I explained in the other answer this doesn't fix the boards mechanically though, and I explained in the other answer how I used snaps in the ...


9

Often the connector side that is "live", having voltage present on it while not plugged in, will be female/sockets and the mating half will obviously be male/pins. It reduces the chance of shock or shorting. Small signal stuff doesn't matter so much, but with power connectors it's more important to keep live contacts inaccessible.


9

Industrial solution to the keying problem is not an epoxy, but a special product called "Male Keying Plug" made of thermoplastic.


9

This should be a standard 0.1" (2.54 mm) pitched header. A name of that thing goes along the lines of SIL (single in line) female crimp housing (for the part which goes on the cable) with fitting crimp contacts for the cable. Something like this and this. There are certainly some already confectioned cables out there (like in the picture you posted). I'm ...


9

You are overthinking this issue. For 4 MHz you shouldn't have any concerns. For example, all PC mainboards use 2x5 headers for on-board USB 2.0 connections to front panel USB, and they operate at 240 MHz quite happily, on billions of PC. Although the 0.100" headers were never intended for RF interconnect and therefore are rarely characterized electrically. ...


9

The split peg is a plastic pin that pushes into a hole on the PCB to provide mechanical strength - also known as a snap pin. From the technical drawing of those connectors, we see this diagram which shows how the peg looks: We can confirm that this is what is meant by the split peg, partly because it looks like a peg that is split, but also because that ...


8

How about etching edge connectors on your PCB's, turning them into cards? Then construct a little PCB back plane stuffed with connector sockets. Maybe some such sockets can be found that will give rise to a 5mm spacing. If no suitable thin-profile edge connector sockets can be found, they could perhaps be condensed by staggering, so that your backplane PCB ...


8

If you have the space for these on every board, you could try using long male headers to stack multiple boards on the same pins: https://www.sparkfun.com/products/10158 If you want to be able to seperate the boards again you can use feed through sockets on the top boards. https://www.samtec.com/products/hle


8

If I understand you correctly, the solder is inside the contact, not the solder hole, then there is no practical way to fix it. Some headers use a forked contact, others use a hollow square. In both cases, the solder gets wicked up with Capillary Action. Once inside, the heat and time needed to reflow the solder, and wick it up with any typical desoldering ...


7

Check out this conductive material, it's a silicon layer with tons of tiny wires in it. They use it in scope probes, testers, and other things. I wanted a tiny bit for myself but they wouldn't just sell me a square :) http://www.shinpoly.com/products/interconnectors/maf01.shtml


7

I'm a new contributor so I can only post two hyperlinks, I found after writing, please type the part numbers below into the search box on the GCT website! Two connector solution 2.0mm pitch - dual in line: Socket: 2.2mm stack height, Newark 67R8237 Header: 2.77mm stack height, Newark 67R7787 (2mm mating pin suitable to mate with BF120 Total stack ...


7

My best luck with removing broken wires from breadboards and headers of this nature is to just use the tip of a jeweler's screwdriver, or the tip of one of the ends of my pair of diagonal cutters to just drag the wire out. You may nick up the header's plastic a little bit, but it is definitely easier to do this before you replace the header in case you can ...


7

""Standard"" length means any length that fits your desired use, unless you are talking about using them with some specific goal in mind. A through hole header has five main dimensions. Pitch between pins, size of the pin, length of the bottom side, length of the post, and length of the top side. The most common are 0.1" pitch, 0....


7

You don't necessarily have to do wave soldering for the THT parts. There's a technique called THR (through-hole reflow) that works for certain components like connectors. Basically the holes get filled with paste (e.g. by dragging it into the hole with a squeegee-like device) and then the pin is inserted in the pasty hole. So this method is also called "pin ...


7

If you are not already doing so you should make sure to use a schematic capture tool that can then create a net list of the design connections. This can then be fed into the PCB layout tool to specify all the connections. This goes a long way to eliminating issues because: It is far easier to get the connections down right on the schematic. In particular ...


7

Samtecs TSW standard 0.1" header has a variable voltage and current rating based on the matching connector it plugs into. This is due to how much surface area makes contact with the header. That says, it averages 4 to 6 amps per pin. http://suddendocs.samtec.com/catalog_english/tsw_th.pdf Based on the common design and material, most headers will have ...


7

Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.


6

For a similar requirement, converting a 20-pin header strip to screw terminals, we fabricated a tiny adapter PCB with screw terminals like this one: The screw terminals are on 0.197" centers, and they interlock nicely on a 0.2" pattern. The PCB used was thus: The screw terminals are arranged in two rows atop the PCB on opposite sides of the header strip, ...


6

When you add a JTAG port to your PCB, you can use the JTAG to debug your software while the microcontroller is on your PCB. This is a huge advantage and will speed up debugging. The choise between between DIP and SMD depends on your soldering skills. If you are able to solder SMD, choose SMD. It's smaller and there are more different microcontrollers ...


6

TE Connectivity's 8058-1G23 is a PCB-mount TO-5 socket that should either fit the sensor or be very, very close. The -1G29 is the same but with solder pockets instead.


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