Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [jumper]

Conductor used to close/open a circuit by connecting/disconnecting a pair of circuit nodes on a PCB. Circuits can also be bypassed using this method by connecting circuit nodes in order to short out the circuit to be bypassed. Jumpers are often used to configure a PCB.

Conductor used to close/open a circuit by connecting/disconnecting a pair of circuit nodes on a PCB. Circuits can also be bypassed using this method by connecting circuit nodes in order to short out the circuit to be bypassed. Jumpers are often used to configure a PCB.

See Wikipedia's article on jumpers for more information.

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Choosing Configuration Jumpers - Solder bridges, 0-ohm resistors, DIP switches, pin jumpers

I'm working on a development board, and need to let users set some configurations. It will be used by students and engineers who are trying to build circuits on a breadboard; I'm not dealing with consumers. Usually, the settings will stay the same,…
Kevin Vermeer
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What is the purpose of the PCB jumpers in the attached image

Can someone please tell me what may be the purpose of the jumpers in the attached image? Why not use a PCB trace instead? Figure 1 The PCB is a part of an old Videocassette recorder (VCR)
Yiftah
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Does the color of Jumper cables matter?

Does the color of jumper cables in a circuit matter? I'm starting out with Arduino and can't get it to work at all with a breadboard! I'm thinking it's something simple like this! I know Black is Negative and Red is positive, but what about green,…
KidCode
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Does a pin jumper adds noise?

When designing a PCB, is it sensible to use a pin jumper in the pathway of a small current signal (around 0.8 uA) or could there be issues with noise? I would use the jumper to select between different transimpedance amplifiers.
joaocandre
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Is there a frequency at which jumpers start to become a problem?

Pin header jumpers (like these) can be used to make optional connections between parts. I would expect at certain frequencies that the these kind of parts become primarily reactive (the imaginary part of the impedance becomes greater than the real…
Andrew Spott
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Why are the 3.3V and 5V power lines shorted in this diagram?

This is the official schematic of ESP32-CAM: Here is the area of interest: Why does this schematic imply that the 3.3V and 5V power lines are shorted through 0 ohm resistors? The masured voltage at P1 pin 4 is 3.3V. I took a closer look at the PCB…
Paul Jurczak
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Designing a PCB that allows to measure current

What is the best way to "debug" the current in a PCB? My (first!) PCB has a 220v->5v PS on it. I would like to measure how much current is using after the PS to monitor how far from the limits my circuit is. To achieve that, I was thinking on adding…
Carlos Garcia
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Why is there risk of overvoltage when jump-starting a vehicle?

Ford Focus C-Max manual describes jump-starting procedure as follows: shut off everything, connect the jump cables, start the donor vehicle engine and let it run for a while, turn the ignition key on the disabled vehicle, the disabled vehicle engine…
sharptooth
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How to do Jumperless Jumpers?

Is there a way to do "jumpers" without actually using a jumper connector on a PCB? Ideally just using holes or pads. For example, one idea for doing it is to use pads on the edge of a PCB then using crocodile clips to do the bridge. Should work ok,…
Keith Nicholas
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What are these small tubes soldered into through holes for jumper wires called?

I am working with ancient 70s PCBs and have encountered these small metal tube-like posts that appear to be soldered into through-holes. They are used to make and remove optional jumper connections without further solder. They seem handy. I'd like…
BZo
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How to join and connect two wires in one connector point professionaly in a high voltage PCB?

Regarding a HV (6KV) PCB design there is a part of the circuitry related to reed relay connection. I have chosen a HV relay (datasheet) with flying lead connection in order to separate physically LV board from HV lines circuit. The full circuit is…
Suvi_Eu
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Strange footprint labeled PJ## on laptop's motherboard

Today I came across a picture of a laptop motherboar (below). I noticed three strange looking small footprints, labelled PJ12, PJ36 and PJ37. The J may stand for jumper, and on the top left corner there is a PJ8 that appears to be covered with a…
valerio_new
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What are the male pin ends on stranded jumper wires called?

I have a pile of stranded breadboard wires, but need to buy or make more. The red one on the left have a solid metal pin, a molded plastic barrel, and stranded wire, and was purchased at Amazon. Most of the stranded jumper wire sets appear to be…
ObscureRobot
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How to add part in eagle board that doesn't have corresponded in the schematic "jumpers"?

I am using Eagle to design single side board and I want to use smd jumpers to connect between some points. So basicly I don't want to add those smd jumpers as a component to the circuit in the schematic, I just want to be able to add them whenever I…
Muhammad Nour
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How are "jumpers" used?

Two settings on a system I've got can be changed using jumpers. This is the connector and the pin description: There seems to be three pins needed to choose between ON and OFF, but how? Do I set them to high/low in some pattern? The documentation…
Andreas
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