60

To electroplate the fingers with gold they must all be joined together electrically. This is done with a "plating bar" trace outside the final board area, which is cut off afterwards. Usually the board edge will be chamfered for easier insertion in the socket. Since chamfering removes the lower part of the fingers they only have to be wide enough to carry ...


58

The French means 'do not use to break the current'. In other words, this connector is not to be used as a switch. Only pull them apart when the circuit is drawing no current. With a 50A rating, and used with DC, breaking the connector circuit is likely to cause an arc as the contacts separate for long enough to damage them.


47

Most likely many reasons, at least the following. It was a requirement for the connector to support hot-plugging. The connectors you mentioned do not support hot-plugging. Using an existing connector also means it is possible for someone to plug in two incompatible devices together just because they use the same connector. The connector also needs to ...


34

Figure 1. An 8-pin DIN connector (IEC 60574-18). Figure 2. Dimensions. Source: Amphenol. Figure 3. The female version has slots to accomodate the simple flat forked contacts visible in the three left sockets.


33

Compatibility with existing connectors is an anti-feature Let's imagine they used the then-common DB-9 DE-9 for USB. What would happen? Lots of mice used a DE-9, and it's used in a lot of other serial ports. People would be plugging a serial mouse into the USB port, and become frustrated when it didn't work. Availability of USB connectors is a problem ...


25

"For disconnect use only" should read "For disconnected use only" in the sense of "Only 'use' this socket (i.e., 'put a plug in or out of this socket') when the the power is off." A good translation would perhaps be "Do not use this plug as a switch" or "Do not use unplugging as a means to turn off." ...


19

While one might expect that the socket's contacts would be a round metal receptacle, there is another design that looks like a fork. The two extensions of the fork make contact with the plug's pins by contacting the pin on either side. This fork-contact has a flat profile, and during manufacture, it is inserted into the slot that you see as a "line". The ...


18

They Learned from Parallel & Serial Ports Until the IBM-PC came along, the "typical" parallel port was the 36-pin "Centronics" connector. Then IBM decided to use a DB-25F connector for the parallel port on the IBM PC. Oops, that was already very commonly used for serial ports on computers and terminals. So they switched the serial port to a DB-25M ...


17

You might consider using screw terminals. Such as shown below. No solder required. Just a small screw driver. It's reliable and durable. And you can try different parts if you need to.


14

It is a DIN connector, commonly used for all connections to amplifiers, remote cabled signal sources, ie turntables, tuners, pre-amplifiers, etc basically used with multicore screened cables carrying low level signals in the audio range. Also some control signals for remote CD players in the car audio scenario. Later RCA coaxial connectors were used for ...


14

For a tool-free solution, use a common female header. (Image from sparkfun.com) The male leads of the header go in your PCB. Insert the capacitor leads in the holes of the header and they are pinched in place. You can choose one that spans enough width for your capacitor. (0.1"/2.54mm pitch shown above). You may want a header with 3+ pins so as to be ...


13

Shrinking with heat makes no sense if its not a closed shape since it would pull apart since the heat activates both the shrinking and the adhesive. If you are after rigidity and toughness then "silicone self adhesive tape", "self amalgamating tape", "self-fusing tape" (or some other name along those lands) will become hard. It looks like a roll of silicone ...


13

To unlock this connector, the black part of this connector needs to be rotated upwards. Check in the following pictures for further clarification:


11

"Heat shrink tape" absolutely does exist. Just do a search using that phrase, and you'll find many vendors.


11

It's to ensure that the connector is pulled down flat to the board. The solder paste during reflow will run up the sides of the contacts, and will tend to pull the joint together, but if there were a continuous pad under the full length of the contact, there's a risk that the solder can accumulate at one end of the contact, from mechanical imbalance in the ...


11

Something may be adding to the confusion. There are indeed 2 different types of 5-pin DIN connector. In this image they are called 5-way 180º and 5-way 240º, and yes, there is a difference in angle between them. 5-way 180º: centerlines of the holes are across a 180º arc 5-way 240º: centerlines of the holes are across a 240º arc The one you need for MIDI ...


11

At the time when the USB standard was being developed, there were a number of widely-available connectors that they could have used instead of making a new custom connector. Why did they not use mini-DIN or DE-9 or some other common connector of the time, instead of inventing entirely new physical connectors, which would then need to be manufactured with ...


11

I have worked as an electrician for over 20 years in the U.S. I also hold an associates degree in electrical technology. This is a very common terminology. It means that this only acts as a "disconnect", which means you use this to "disconnect" the power, to either work on the equipment, or as a way to wire in portable equipment. As opposed to a breaker, ...


11

There are also some pretty large busbars. The connection here is done with 14 bolts the size of a man's thumb.


10

I believe it's a JST PH 2.0 connector. Waveshare's product page for the e-Paper HAT says the package includes a "PH2.0 20cm 8Pin x1" which then made things quite easy :-) The connector is a JST PHR-8, available here or here for instance.


10

Special order from Samtec, Molex, or other manufacturer, prices are reasonable even in small-ish quantitues like 1000 pieces. For really small quantities get out your pliers and modify them by hand, the pins just pull out.


10

This kind of crimp splice connection is popular in appliances, as it requires no soldering and can be used at relatively high temperatures. It comes off a roll of such connectors or a roll of strip brass, in which case it can be called a band splice. I have emulated this with ferrules and a collet hand crimping tool in order to fix our prized sandwich ...


9

Regarding your question about shrink ratios, the highest I've seen is 8:1 I think. Most "high ratio" shrink tubes achieve that high number by being lined with hot melt glue, which gets squeezed down to a much smaller diameter than the actual tube's ID. It makes for a waterproof and very robust seal that is seriously difficult to remove.


9

POAG Potentialausgleich (German: Potential Equalization) POAG connectors are used for connecting items together for grounding and potential equalisation purposes, often in hospital and laboratory environments, and there is a European standard: DIN 42801, recognised worldwide.


8

I have tried fitting a 2.1 mm barrel plug in a 2.5 mm jack (by accident or consciously) many times and it has never fit. Both sides are rigid and there is not enough clearance. Size adapters are available; I recommend having some around for use when you have a device that doesn't come with a power adapter and an adapter with the right voltage. They do have ...


8

Looks like 5-pin 180° DIN connector.


8

21 Position Connector Receptacle, Outer Shroud Contacts https://www.digikey.ie/product-detail/en/amphenol-icc-fci/91930-21121LF/609-1591-ND/1001905 From Jasen's comment and datasheet: datasheet note 7 "the three slots may be located at either end"


8

A truly definitive answer might be too long, so I will try to highlight some of the concerns rather than be comprehensive. First, for high speed digital or sensitive analog signals, it is best to avoid this practice. High speed traces suffer signal degradation if there are long stubs. For inputs (for example a microphone input), long traces can become ...


7

I've found Sugru to be useful in cases like this. It's a silicone rubber that you can mold like putty. Once formed, it will cure and develop a texture similar to rubber. Mold some into a flat strip, wrap it tightly around where the joint where you'd apply heat shrink, and let it cure. You can use different thicknesses to adjust the stiffness, texture, ...


7

Sense pins are connected to ground at power supply or adapter cable. This allows the PCIE card to detect if a supply cable is connected or not, and whether a 6-pin supply is connected to 8-pin socket to indicate less power is available. It is not used by the power supply for "remote voltage sensing" to compensate for voltage drop over the wiring.


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