# What edge connector for prototype board?

For personal hobby projects I'm using prototype boards like this (2.54 mm pitch):

I connect them using wires, which is a mess. I want to use a backplane with female edge connectors, for a solution like this:

Making a PCB is out of question, mostly because I keep adding components to my projects to add further functionalities.

After searching, the only female edge connector I found was 3.96mm pitch ones, that seems to be incompatible with prototype boards.

I'm looking for a solution, better if it accepts the prototype board as is (without a male connector). Cost is not a big factor.

Any sugestion is welcome.

Edit

Durability is not an issue; I keep producing new versions every 12 to 18 months. Cheap components, hardware is totally disposable (I don't even bother recycling them).

• canada.newark.com/samtec/tms-133-01-g-s-ra/… – Eugene Sh. Apr 27 '18 at 18:29
• That backplane doesn't use edge connectors. – Ignacio Vazquez-Abrams Apr 27 '18 at 18:50
• "Making a PCB is out of question, mostly because I keep adding components to my projects to add further functionalities." Well, you know you could actually design your own PCB that includes a prototyping area (in addition to edge contacts). Just sayin'... – dim Apr 27 '18 at 19:07
• Ignacio's comment on my answer brings something up: is the 3.96 mm pitch between adjacent pins or between rows? – Andrew Morton Apr 27 '18 at 19:10
• The companies that make Veroboard also make versions with edge-card connectors. For example – The Photon Apr 27 '18 at 19:44

If you are not averse to cutting down the PCB and chamfering the raw edges slightly* then something like an ordinary PCB edge connector could work with ordinary Veroboard as the backplane PCB for single-sided daughter boards.

* Remember it's fibreglass so don't get the little shards on your skin or in your lungs if you can avoid it.

• @IgnacioVazquez-Abrams From counting the pixels in the OP's photo I determined that the 2.54 mm pitch of the example connector would be just right. And in the other direction... well, it's Veroboard so it can be persuaded. – Andrew Morton Apr 27 '18 at 19:06
• Never mind, I misread the row-to-row spacing as the pitch. – Ignacio Vazquez-Abrams Apr 27 '18 at 19:07

Why not do it like in the picture you posted?

Your prototype board already has the holes to fit 0.1" right angle male headers on the edges, and you can use strip board as the "backplane" with female 0.1" connectors.

You can get all of this on aliexpress for ridiculously low prices (like $1 = 500 pins worth of headers). Using a card edge connector is just going to be more cumbersome and more expensive. Also the fingers on your protoboard are too short, they don't reach the edge, once you solder something into the holes they'll be full of solder, and you'll need to cut the board... or you can use a$0.05 pin header!

• They looks rather flimsy to me. I want something heavy duty, able to withstand many insertions/extractions. (I already have those for my Arduino projects). – Candid Moe Apr 27 '18 at 19:05
• @CandidMoe You should add the durability requirement to the question ;) – Andrew Morton Apr 27 '18 at 19:07
• If you want Card edge connectors to withstand "lots" of insertions, you need gold plated fingers with enough gold thickness... immersion gold PCB finish is very thin, it protects against oxidation, not mechanical wear. Also 18 or 35µm copper plating is less durable than solid metal pin... – peufeu Apr 27 '18 at 19:09
• @CandidMoe I think you'll find that pin headers are quite durable. However you might not want to use them if your board needs to resist mechanical shock or vibration, as (especially the right angle ones) they can act like a spring. – immibis Apr 28 '18 at 2:38

JST connectors

This could be a little bit too advanced or too much but it is a good practice to start using them in your hobbies because most companies in the tech industry use them. Plus you will learn how to crimp, and for the size of the connector you are looking for the tool is really affordable; Amazon has it for around \$22. I know the link I gave you is for 2.50 mm pitch but it should be able to work.

• Delete the extra space between the ] ( of your hyperlink and it should hide the website. – KingDuken Apr 28 '18 at 1:51
• I'm already using wires, both with JST connectors and male/header pin connectors. That makes a rat net of wires over the boards. Also, there is the risk of plugin things incorrectly. With a backplane, no such risk. – Candid Moe Apr 28 '18 at 8:26