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Questions tagged [connector]

Mechanical part providing electrical contacts for a cable or electronic circuit board.

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207
votes
7answers
186k views

Why was Mini USB deprecated in favor of Micro USB?

Mini USB connectors were standardized as part of USB 2.0 in 2000. In 2007, the USB Implemeters Forum standardized Micro USB connectors, deprecating Mini USB connectors four months later. Why? What ...
64
votes
11answers
312k views

How can I tell the size of a barrel power connector?

Spring cleaning, and I'm trying to get power supplies for all my devices with missing power supplies. They're all the typical barrel power connector, and I'm having a dickens of a time trying to ...
53
votes
12answers
64k views

How to connect USB Connector shield?

How should I route USB Connector shield on PCB? Should it be connected to GND plane right where USB is placed, or should the shield be isolated from GND, or should it be connected to ground through ...
44
votes
7answers
10k views

Why aren't headphone jack shaped plugs used for data?

With Apple's lightning cable, and USB 3.0, reversible cables are taking off, and I personally think this is very convenient. But we have had better than reversible for a long time, in the form of the ...
44
votes
4answers
6k views

What are the advantages of this gold finger shape?

Some PCBs, like the PCI card specification have gold fingers which start very narrow near the bottom edge, and gain their usual width much higher, where the actual contact is expected to be made. ...
28
votes
2answers
3k views

Why are the contacts for the Data lines in USB A and B plugs shorter than the contacts for Ground and Power?

I was reading up on USB connectors on Wikipedia and I've noticed that the contacts for the data lines (D+ and D-) are shorter in both the Type A and Type B plug. What could be the reasoning behind ...
27
votes
1answer
22k views

What to do with third contact in DC barrel plug with only two input contacts

My AC-DC adapter gives output of 12V and GND. I tried to search for suitable DC barrel plugs and found that most of them have three terminals So, pin 1 is positive in my case. 1. Which pin should I ...
27
votes
2answers
11k views

Connectorless USB on a PCB

I would like to make a board which can be plugged directly into the USB port of a computer, instead of using a separate male "USB-A" connector. I have seen this system used for very small USB memory ...
24
votes
3answers
2k views

What does “no fit” mean in electronics?

I have found at some places, especially: Raspberry Pi Forums eLinux RPi Hardware page the following wording: S2: DSI interface. 15-pin surface mounted flat flex connector (possibly no-fit) S5: ...
24
votes
8answers
10k views

Why do USB connectors only fit one way?

Why do USB plugs only fit one way into USB ports? Forgive my ignorance, but there are several types of plugs that are "omnidirectional" and do not have to be oriented a certain way to fit into the ...
22
votes
4answers
4k views

Preferences: Male or Female connector on board

On a prototyping board for use by students, should one place male (pin) headers or female headers on the PCB, considering that most of the pins will be unused most of the time. I'm inclined to place ...
21
votes
8answers
7k views

Suggestions for small and handy connector for in-circuit programming?

I have many PCBs that use an AVR in SMD packaging, and since I frequently change the firmware in prototype boards, I'm trying to come with the best solution to program the AVR quickly and easily. The ...
20
votes
2answers
15k views

Castellated/Edge-plated PCBs: Comments on Mechanical/Electrical contact reliability

(This is a follow-up to this related question). I'm interested in some feedback from people's design results/experiences with Castellated PCBs as a method of attaching one PCB to another. By ...
20
votes
3answers
1k views

Do magnetics connectors exist?

Conventional connectors, where the plug and socket have metal parts which touch, suffer from the following problems: Limited mating cycles or expensive plating. Impedance mismatch (relevant for high ...
19
votes
2answers
471 views

What's the need for conductive bridges between the regions of a smart card contact pad?

Here's a scan of a "chip-and-pin" Visa Electron contact pad It looks like a metal plate divided into regions by narrow cuts. Look for example at regions marked A ...
19
votes
4answers
589 views

Trying to identify threaded round 2-way power connector on a radio

I'm trying to find a power connector for a Maxon DM200 Mobitex radio terminal. As far as I'm aware, the part of he manufacturer who made this radio closed down some years ago, and there's no support ...
18
votes
9answers
24k views

How can I make connection on pcb (circuit board) holes without solder (for prototyping)?

I have a Pro Micro board (very small -- see pic below) and it has connector holes in the printed circuit board. Best Non-Solder Connection (Easy and Removable) I'm wondering the best way to make ...
17
votes
4answers
3k views

What kind of wire connectors are these? [duplicate]

The loop ones. I've never seen them before.
16
votes
8answers
15k views

Ideas to stack multiple PCBs on top of each other?

My design has a number of boards stacked on top of each other. I would like to connect signals across the boards. The boards all need the same 10 signals running through them (all boards from top to ...
16
votes
1answer
2k views

Reasoning behind Ethernet pair order

An Ethernet connector seems to use a surprising choice of signal placement in its RJ45 connector. Does anyone know the reasoning behind: The decision to make pair 2 straddle pair 1? Why Ethernet uses ...
15
votes
6answers
4k views

Is there a low-cost alternative to RJ45 cables for large number of signals?

We are designing two interface (printed) boards and need to connect them by cables (0.5-1.5m). So we're thinking about which connectors to use. We'd like to use twisted-pairs like in a RJ45 cable. ...
15
votes
4answers
5k views

OK to connect boards perpendicularly like this?

Are there any disadvantages in using the following method to accomplish a perpendicular board-to-board connection? (i.e., any disadvantages in terms of board manufacturing capability/cost assembly ...
15
votes
5answers
11k views

Ideas for attaching / connecting / stacking one PCB onto another with no gap

What methods might be feasible for attaching/stacking one PCB immediately on top of another PCB, with the following conditions: Zero spacing/gap between the two PCBs Electrical contacts are needed, ...
14
votes
4answers
21k views

Deciphering a DC jack schematic

I am trying to include a DC jack on one of my PCBs. I am just setting up the footprints now, and I am not quite sure which pin is which. What do the symbols on the drawing mean? I have included a ...
14
votes
1answer
5k views

Mysterious LCD interface without wires [duplicate]

I was ripping off a Center 352 Infrared Thermometer. The basic functionality is to sense the temperature and display it on an LCD. The LCD turned out to have no interface to the controller. The PCB ...
14
votes
2answers
12k views

Understanding Audio Jack Connection

I have circuit that has an audio connector that has the following diagram. Audio connector is one that I am not familiar with. What I gather is that the rectangle on the left is the sleeve (entry ...
14
votes
3answers
13k views

What is the name of this connector from a fan?

I am EE hobbyist and I often used recycled parts in my projects. I came across this connector to a Heat Sink Fan and would like to know the name of it. Thanks for the help.
14
votes
4answers
7k views

How to find socket for keyboard connector?

I am looking for a socket which is able to receive the connector of the ThinkPad X41's keyboard. How do I identify the socket so that I can find it on the (German) market? Background: I want to build ...
14
votes
1answer
2k views

Using a via to strengthen surface mount connector on or near pad

I am trying to design a board that has a surface mount connector. I was shown a picture of an example board that has vias on the pads of the connector. I don't believe the via is for connecting to a ...
13
votes
4answers
3k views

Heat-shrink tubing available as a roll like adhesive tape?

Many people who have used heat-shrink tubing have probably experienced this: you forgot to insert heat-shrink tubing before soldering, and now it's too late! Indeed, once the soldering is done: you ...
13
votes
4answers
9k views

Best edge connector for my pcb?

I am making a PCB where the goal is to keep BOM as low as possible and also the cost to the lowers. It has proven to be quite a difficult task but I am at a final stage now. My PCB needs to be ...
13
votes
2answers
1k views

Are these pin connectors a standard part? If so, what are they called?

This is a "wet" temperature sensor for a Boilermate 2000 thermal store. The pin connectors are inserted into a plastic plug that connects to the control board (see 2nd image). The pins do not stick ...
13
votes
3answers
4k views

Alternatives to screw terminals, breadboards for prototypes?

Often I want to connect components that operate at less than 5v (I mention this as it may have a bearing on the gauge of the wire?) But have an easy way to disconnect. Screw terminals are nice but ...
13
votes
1answer
2k views

What is this type of flexible contact strip called?

The LCD below is from a cheap digital clock which was (obviously) damaged (broken glass). The electrical connection between the PCB and the display was realized with this pink strip. Its flexible... ...
13
votes
2answers
992 views

Best way to group power pins on a connector?

I am designing a little mezzanine PCB that uses Hirose DF12 connectors to connect to the motherboard. Four different voltages are delivered to this PCB: ±10v, 3.3v, 48v (and ground). They go through ...
13
votes
3answers
8k views

What electrical connectors to use underwater?

I am looking at doing a project with a AUV (autonomous underwater vehicle) and need to know the best type of connectors to use. I have listed the things I need from most important to least important: ...
12
votes
4answers
144k views

How to tell polarity expected of a DC barrel jack?

I'm sure this information is somewhere around the internet, but I can't find it. I have a device that takes a DC barrel jack. I don't know the polarity it expects though. There is a marking though. ...
12
votes
3answers
2k views

What type of Connector is this?

The connector on the left is a standard BNC, but could someone please tell me what the connector on the right is?
12
votes
3answers
3k views

What does the pill-shaped 'X' mean in electrical schematics?

I'm not familiar with this symbol. Does it have a name? What does it imply when reading an electrical schematic?
12
votes
2answers
3k views

How many ground and power pins to have in a connector?

I'm designing a daughter board for a project. There are 35 I/O pins that need to go to the board. How do I determine the number of ground and power pins to include? How do I determine the placement of ...
12
votes
1answer
1k views

What is this Ribbon Cable Connector called?

Even after extensive scrolling through Google Image Search, I could not find this connector or one similar to it: I am especially interested in finding the mating connector.
12
votes
2answers
2k views

A way to determine a symmetric connector's position

I have an old, custom pair of connectors in use by what will be a large number of systems. The connectors are mother/father and symmetrical, as in they don't have a mechanical guide to have the user ...
11
votes
1answer
1k views

Why were NES cartridges unreliable? Why did they take so much effort to get playing properly?

This has always been something I was curious about, but now as I'm researching building circuits for use as game pieces it's actually a professional curiosity. Specifically swappable, interlocking ...
11
votes
2answers
6k views

Soldering a high-power cable to a PCB

I want to make a power connection between my PCB and an accumulator. I need it to handle up to 100A, and to be mechanically very strong, because it will be on board of a buggy car model. In the ...
11
votes
3answers
2k views

Crimping tool basics

When I design a printed circuit board, I often put 100mil male header anywhere. Sometimes I think it would be better to place some connectors for more reliability. Anyone here knows which connector/...
11
votes
2answers
652 views

Sockets or pins, and why?

I think I've found a solution for my previous question and I'm now going to order some FCI "Clincher" connectors from a local supplier to try them out. My question is, should I terminate the ends of ...
11
votes
8answers
12k views

What are those wire terminals that mate with standard header pins?

I have purchased "dupont" connectors on Ebay that crimp onto a wire. They look like this: http://www.hansenhobbies.com/products/connectors/pt1inconnectors/pt1in_ft/ I'm tired of waiting weeks for ...
11
votes
4answers
1k views

What are these coaxial connectors called?

I know these are coaxial and probably SMB, however, I'd like to know how each particular type of connector is called. Moreover, I was wondering if these colors mean anything in particular (i.e. if ...
10
votes
3answers
3k views

Anyone either read japanese or know about laying tracks for a micro SD card slot?

I'm trying to include a micro SD card slot in a project I'm working on and I'm having a little trouble with the datasheet. Unfortunately I don't read japanese. Just wondering what the text says in ...
10
votes
4answers
12k views

What is the best way to solder these wires to circuit board?

What is the best way to solder these stranded wires onto a vero board (strip board)? I am thinking maybe using some kind of connector instead of just soldering on. It will make things more flexible. ...