Introduction beginner jumper socket, A jumper is a low-cost substitute for a switch, where a connection has to be made (or unmade) only a few times during the lifetime of a product. Typically it allows a function or feature on a circuit board to set on a semipermanent basis, often at the time of manufacture. A DIP switch works the same usemore conveniently.
A jumper is a very short rectangular plastic tab containing two (or sometimes more) metal sockets normally spaced either 0.1″ or 2mm apart. The sockets attached electrically inside the tab so that when they pushed over two (or more) pins that installed on a circuit board for this design, the jumper shorts the pins together. The pins are normally 0.025″ square and often part of a header that soldered into the board. In a parts catalog, jumpers found in a section titled “Headers And Wire Housings” or similar.
In the introduction beginner jumper socket show, Three jumpers show in Figure 1. The blue one includes two sockets spaced 0.1″ and is deep enough to enclose the pins completely. The red one includes two sockets spaced 2mm and may allow the tips of the pins to emerge from its opposite end. The black one includes four sockets, each pair spaced 0.1″ apart.
The set of pins with which a jumper is utilized is often referred to as a header. Head possible with pins in single or dual rows. Some headers designed snapped off to provide the wanted number of pins. 28-pin header shown in Figure 2 with a black jumper pushed onto a pair of pins near the midpoint.
A jumper assembly may be a kit including not only the jumper but also the array of pins with which it is intended to use. Check the manufacturer’s datasheet to find out exactly what added.
The most common types of jumpers have two sockets only, but variants are available with as many as 12 sockets, which may be arranged in one or two rows. Header sockets may be joined as a substitute for purpose-made jumpers, with the help that they are often sold in long strips that can be closed off to provide as many sockets as needed. However, the pins attached to header sockets must manually connect by soldering small lengths of wire between them.
In some jumpers, the plastic tab increases upward for about half an inch and functions as a finger grip, making the jumper much easier to hold during insertion and removal. This is a useful feature if there is room to accommodate it.
The socket inside a jumper often produced from phosphor-bronze, copper-nickel alloy, tin alloy, or brass alloy. They normally gold-plated but in some instances tin-plated.
Rarely, a jumper may consist of a metal strip with U-shaped connections proper worked in conjunction with screw terminals. Two jumpers of this type shown in Fig 3. They should not confuse with high-amperage fuses that look superficially similar.
The spacing between the sockets in a jumper is connected to as its pitch. As previously noted, 0.1″ and 2mm are the most popular values. A typical best rating for a jumper of 0.1″ pitch is 2A or 2.5A at 250V.
≡ How to Use it
A jumper may activate a “set it and forget it” circuit function. An example would be the factory shape of a product to work with 115VAC or 230VAC power input. End users were required to set jumpers in some computer equipment sold during the 1980s, but this is no large the case.
≡ What Can Go Wrong
Jumpers simply dropped, easily lost, and easily placed incorrectly. When purchasing jumpers, buy extras to offset for their fragility and the ease of losing them.
Any location where a jumper may use should clearly label to define the function of each setting.
Cheap, poorly made jumpers may self-destruct from mechanical forces when removed from their pins. The plastic casing can come away, leaving the sockets sticking simple to the pins protruding from the circuit board. This is another mind why it is a good idea to have a small stock of spare jumpers for emergencies.
Oxidation in jumpers where the contacts are not gold- or silver-plated can create electrical resistance or unreliable connections.
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