Questions tagged [contact]
The contact tag has no usage guidance.
82
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Relay contact resistance spec off?
This Finder relay series specifies
Power lost to the environment without contact current W 0.4
with rated current W 1.4
And a rated current of:
Rated current/Maximum peak current A 10/15
If I ...
- 1,050
4
votes
1
answer
50
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Molex PicoBlade current rating confusing
It seems there are confliction in specifications of PicoBlade for current rating.
From the MolexPicoBlade Connector System datasheet,
I assume that the current values in table is per circuit value.
...
- 221
0
votes
2
answers
73
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Which wire gauge (AWG) to make copper brushes?
I have to realize some sliding contact between a board and another one. The moving board has a fixed rail, and it can move horizontally.
I want to transfer power from the bottom board to the top one. ...
0
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0
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How do I connect to the strange black contacts on a PC keyboard's PCB?
I want to build a little box with switches, so that I can flip a switch and it will hold down a keyboard key on my PC. My idea is to take the little PCB from an existing keyboard (a Microsoft Wired ...
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0
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49
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Contact measurement
I have a mechanical assembly that is to be mated to another surface. To ensure that my assembly is correctly mounted before installation, I have a test piece I insert into it. When everything is OK ...
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4
answers
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Spring-loaded pins for power transfer
I am trying to build an automated battery swap mechanism for drones.
What I currently have in mind is a battery housing sitting on the drone which has electrical contacts on the inside, and a Li-po ...
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4
votes
2
answers
929
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What is the name of this battery contact type?
In the following video (timestamped): https://youtu.be/rylbFnTgFI8?t=107, you can very briefly see a C shaped battery contact within the "cap" of the battery kit.
The benefit of this ...
- 155
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2
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173
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Attaching a component to the shaft of a DC motor
Does anyone have any idea how to mount, say, an LED light, on top of a spinning motor shaft without getting the wires tangled?
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86
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Connecting a battery lead without soldering
I have this battery with two leads, much like a capacitor. Due to several constraints (size, labor, etc) i am looking for a way to mount it without soldering. Simply pushing it in place would be great ...
- 841
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1
answer
85
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Maximum inrush current and contact rating?
I am doing a hobby project where I am using a thermostat which has a contact rating of 230 VAC, 5 A. Please see below thermostat details (RS link also contains full datasheet).
I want to drive a ...
3
votes
1
answer
276
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Does the dropper between the catenary wire and contact wire carry current?
From my observations, droppers are of metal and they do not have any insulation from the catenary wire or from the contact wire.
The catenary and contact both carry the same phase and voltage so any ...
4
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1
answer
509
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What are these battery power connectors called?
I'm trying to source some battery contact connectors for sliding straight metal strips into. They're the sort of thing that are used in power tool batteries, but I want to use them for a different ...
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1
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289
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Relay contact sticks-Led driver
I m using relay 230vac/10amp to switch on/off LED driver.
But sometimes relay sticks. Loads are nowhere close to 230v*10amp=2300watts.
I cant understand what is causing this. i tried connecting an NTC ...
- 21
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votes
2
answers
128
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Keyboard Repair: Both Shift Keys Dead [closed]
I have an old notebook working perfectly fine. The only issue is that both shift keys are completely dead:
keyboard top view
keyboard bottom view
...
1
vote
2
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777
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Minimum load (current) through relay contacts: low current, bad contact?
I use photocells connected to very "consumer" gate automation boards. Those photocells output the infrared beam status via a relay with
potential free contacts. The relay is the Hongfa HFD23 ...
2
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2
answers
884
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Why is that vias are generally made of tungsten while contact is made using aluminum?
From this thread:
...
- 416
0
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1
answer
47
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Schottky barrier at equilibrium
At equilibrium, the barrier for electrons to go from metal to semiconductor is higher than the barrier for electrons to go from semiconductor to metal. Shouldn't that mean there are more electrons ...
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1
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77
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"Filled" custom stainless steel washer or alternatives for solderless contact [closed]
My apologies if this isn't the right stack exchange to ask in, I can't figure out which one to post in.
I am currently trying to make a solder-less electrical contact by squeezing a nickel strip ...
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2
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132
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What manufacturer is this contact?
I have a relay contact, that I am trying to identify. It is from an Audi, who mostly use TE/Tyco, but this is different. It has this marking on it:
Which I have tried to replicate here for clarity:
...
- 139
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2
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77
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Relay sepcs and Contact capacity explain
I design a simple control system using MCU, ECU and a relay to control an 220vac inductive load of 20A max current
So i decided to use a 30A relay
I found two relays JQX-16F(T91) - write on them the ...
0
votes
1
answer
74
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Contact closure input
I am designing a test box with an enable switch that provides 0v disabled or 5v enabled to a digital input. I also want to have an external enable switch that allows an external contact closure input ...
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1
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118
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Minimum switching capability/Minimum permissible load for a relay
I am working with a DC relay thats contacts are rated at up to 10 amps at 600v.
I am aware relays also tend to have a minimum switching current, however none is listed for this relay and this seems ...
0
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0
answers
26
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Electromechanical relay AC load synchronization
I am trying to check the durability of a relay (G5LE family, 5v relay). I wanted if the relay contacts will still work after a certain number of cycles (ex. after 1 million switching cycles).
I am ...
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2
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296
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Instantaneous overcurrent relays for motor protection
Can someone please clarify something about below statement.
"For motors that are prone to locked rotor, instantaneous overcurrent relays, adjusted to pickup at 200 to 300% of rated motor current, ...
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1
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80
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What is the name of this item contact pin?
I am making a box with lights inside of it. These lights are UVC lights, which will sanitize any items put inside. I have attached a photo; I would like to know the name of this item. I know it is ...
1
vote
1
answer
79
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I'm trying to find this contact for a 3d printer
So one of the contacts that detect the cartridge in my 3d printer broke. I'm trying to find a similar generic contact that I can solder on. It's for a discontinued CubePro so I doubt I'll find any ...
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4
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1
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262
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How can a marginal connection become "good" by just applying a little more voltage?
"On the side" I do a fair amount of repair work to guitar gear -- Amplifiers, pedals, guitars, etc...
I've had a similar symptom occur on different repairs, and found the same root cause for ...
- 4,558
0
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2
answers
176
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12 vdc arc suppression on 12v solenoid contacts, switching a car starter motor on and off
Would anybody be able to advise the best way and components required to minimise contact burn up, on a car motor starter solenoid which is being repeatedly opened and closed? This is a lure machine ...
0
votes
1
answer
110
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125vdc Snubber Circuit for Relay Contacts - 125vdc, 3.2amp load
Does anyone know of a manufacturer that makes a prebuilt "ready-to-go" Off-the-shelf snubber circuit / Arc Suppressor that can be used to protect the contacts of my dinrail-mounted relay. My load ...
1
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5
answers
8k
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Relay contact (switching) voltage
I have a relay with following contact rating:
Since the maximum switching voltage is 250VAC/25A, can I use this relay to switch 380VAC/1A load? What is the consequences?
3
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1
answer
4k
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Is WD40 good for restoring corroded electrical contacts?
One of the pins inside my iPhone has corroded my dad said to put a little bit of WD40 on the contacts his an engineer but to me oil on electrical contacts sounds wrong my friend said use alcohol too, ...
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1
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56
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Proper way of connecting wires to pins on polymer films
What is the proper way to connect wires to contacts from a thin semitransparent "plastic" foil (see images). There are slightly different types; the first one with the 4 pins in a row is the more ...
- 201
0
votes
2
answers
195
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NC Opening Contact detector to drive a NO relay Contact circuit
I'm looking for a simple +5.5vdc powered circuit (perhaps a PNP transistor driving a NO Reed Relay coil?) - I need a circuit that can detect when a pair of Normally Closed contacts with no voltage ...
- 1
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2
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112
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Sparking and electrical arcs in electrical contact
Consider a group of 5 batteries joined up to two pieces of finely engineered metal, that form common positive and negative bridging contactors for the group.
If one of the batteries were to become ...
- 887
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0
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66
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How is the lever position read?
I am servicing a truck rig. This is the system that reads the "turn light switch" and "windscreen wiper switch".
I would like to understand how the image plate 1 reads each position of the levers. On ...
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1
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824
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Why does the X-box 360 controller battery pack have an integrated breaker contact?
People owning an X-box 360 with wireless controllers came across a phenomenon where older controllers were switching off randomly while playing or if they were moved too quickly. Me and everyone I ...
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2
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7k
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Motor with two endstops using limit switches
I have a circuit where two limit-switches to be wired with motors to do the following functionality. It is to be used in a remotely placed device so that the intervention of microcontroller on the ...
- 109
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3
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338
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Contact Closure over distance
I have a contact (pushbutton) that's about 10 metres away of a Raspberry Pi.
However; it behaves quite erratic and would trigger when for example an exhaust fan is started in proximity of the wire. I ...
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3
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2k
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What is initial contact resistance in relays?
I am reading datasheet of a relay. I see a term, initial contact resistance in relays. What is the definition of this parameter? Thanks.
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2
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340
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In measuring relay contact resistance, should I use 4 wire measurement or calculate it using the voltage across the relay and current?
I'm reading mixed things online where a current from a typical ohmmeter is too low to accurately tell us the true resistance of the relay contacts.
I've got a 30V 2.5A power supply, electronic load, ...
1
vote
1
answer
142
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Application based Heat sink design for Power diode
Instead of having a heatsink directly connected to the diode, I want to have a 2 mm layer of cold rolled steel in between case and heat sink(aluminium){for waterproofing as needed in the application}. ...
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1
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Is a DMOS potential free? (in case of TPIC6C596)
I've been looking at the Datasheet of the TPIC6C596 and I'm not sure if the DMOS that is mentioned in the package can be used as a potential free.
I also don't know in general if a DMOS can be used ...
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1
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3k
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Modify Ring Contact Sensor in a series of wired security reed switches
After reading the instructables post on the simplisafe sensor I modified the ring sensor and tried to integrate it with my wired sensors. This is what I found:
testing with a spooled wire about 20 ...
- 1
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0
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Ensuring good contact between ring terminals and the screw terminals they're bolted to
I'm working on a high-current switching converter for research purposes. Because of the voltages and currents involved, many components use screw terminals to connect to wires. I haven't used screw ...
- 28k
3
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0
answers
486
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How should one terminate litz wire?
When using Litz wire, the accepted method of stripping the wire is by dipping it in a solder bath, which effectively turns the end of it into solid-core wire, so my question is thus:
How good is the ...
- 28k
2
votes
1
answer
626
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How to contact aluminum busbar
For a project I need to handle large current, about 1200A.
To do so I intend to distribute the power using busbar.
Copper would be a good option but is fairly expensive and aluminum has almost the ...
- 7,835
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1
answer
105
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Schematic Feedback
I am looking for design feedback regarding the following schematic.
The idea is very simple.
The Controller board pulls the relay coil terminal low on the relay board to activate the relay.The relay ...
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4
answers
471
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Contact a very small area (impedance matched)
In my current project, I want to apply a voltage to a capacitor (top electrode on a thin film heterostructure) very rapidly. Since capacitors have their own charging rate \$(\tau = R \cdot t = R \cdot ...
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3
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264
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38999 contacts for pcb through-hole pass through connectors
So I'm working on a board that will act as a pass-through for a m/f pair of connectors interjecting to trace off some of the contacts to connect to another device for monitoring the signals. We did ...
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639
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Contacts corroding - why?
These solder joints on the connector look strange to me (tarnished purple).
In a more "advanced" state, they end up looking like this:
In the last image you can see, it even "ate" the plating ...
- 91