Questions tagged [contact]
The contact tag has no usage guidance.
90 questions
4
votes
3
answers
443
views
Relay contact welding detection with opto-coupler (both on line and neutral)
The relay switches both the line and neutral, and I need to detect if one of the contacts are welded. I've made this circuit, but if a load is connected, a small current flows through the diodes and ...
- 41
3
votes
1
answer
212
views
What is the contact material for typical solderless breadboards?
A question about using oversized leads in solderless breadboards got me thinking about how I damaged a breadboard back in my hobbyist days, and whether there's any difference in how cheap or expensive ...
- 38.5k
0
votes
2
answers
106
views
Seemingly dielectric grease in my rotary switch
Look at the picture of my teardown of the SP10T I ordered quite a while ago from DigiKey, https://www.ckswitches.com/media/1349/arotary.pdf. Opening it, it's got grease on the contacts. Much more on ...
- 409
0
votes
3
answers
169
views
Why isn't tungsten used for multimeter probes?
Gold is considered the best multimeter probe tip (though disadvantages are
that it comes off easily when rubbed and is expensive) since its surface
hardly oxidizes when exposed to room-temperature air,...
- 728
1
vote
2
answers
181
views
Simplest circuit to detect 5 V pulse
I have a mechanical assembly with 24 switches, limit switches, selectors, etc. and this assembly along with a box filled with electronics will go and suffer a very long shock and vibration test.
I ...
- 21
1
vote
0
answers
32
views
What is a good contact pressure for bolting steel busbars onto steel battery terminals?
I would like to achieve a good/low contact resistance. From other graphs I've seen for copper and aluminium, there's a point of diminishing returns regarding contact resistance vs contact pressure. I ...
- 11
-1
votes
1
answer
142
views
5V Relay, triggered with power on/off [closed]
I am new to this forum and came across it trying to find a solution for what I thought would be an easy problem to solve.
I work in custom AV installations and I was hoping to find an off-the-shelf ...
0
votes
0
answers
78
views
What kind of relay / switch is this?
What kind of relay, if I'm right, is this? It is used in a PRCD.
Pictures from 3 sides.
- 1
3
votes
3
answers
207
views
Relay contact resistance spec off?
This Finder relay series specifies
Power lost to the environment
without contact current 0.4 W
with rated current 1.4 W
And a rated current of:
Rated current/Maximum peak current 10A / 15A
If ...
- 1,061
4
votes
1
answer
258
views
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
136
views
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
votes
0
answers
81
views
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 ...
- 330
1
vote
0
answers
52
views
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 ...
- 31
6
votes
4
answers
2k
views
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 ...
- 69
4
votes
2
answers
964
views
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
2
votes
2
answers
416
views
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?
- 87
0
votes
0
answers
179
views
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 ...
- 1,395
1
vote
1
answer
189
views
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 ...
- 11
3
votes
1
answer
467
views
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
votes
1
answer
1k
views
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 ...
- 676
2
votes
1
answer
492
views
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
0
votes
2
answers
227
views
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
answers
1k
views
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
votes
2
answers
2k
views
Why is that vias are generally made of tungsten while contact is made using aluminum?
From this thread:
...
- 270
0
votes
1
answer
56
views
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 ...
- 457
0
votes
1
answer
85
views
"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 ...
- 155
0
votes
2
answers
143
views
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:
...
- 201
0
votes
2
answers
93
views
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
95
views
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 ...
- 1
0
votes
1
answer
310
views
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
votes
0
answers
28
views
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 ...
- 431
2
votes
2
answers
482
views
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, ...
- 49
1
vote
1
answer
88
views
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
89
views
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 ...
- 23
4
votes
1
answer
309
views
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 ...
- 4,668
0
votes
2
answers
240
views
12 VDC arc suppression on 12 V 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 ...
1
vote
1
answer
139
views
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
vote
5
answers
8k
views
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?
user130872
3
votes
1
answer
9k
views
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, ...
- 199
0
votes
1
answer
66
views
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 ...
- 203
0
votes
2
answers
311
views
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
1
vote
2
answers
145
views
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 ...
- 949
0
votes
0
answers
80
views
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 ...
- 583
3
votes
1
answer
1k
views
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 ...
- 71
1
vote
2
answers
9k
views
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
0
votes
3
answers
596
views
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 ...
- 885
5
votes
3
answers
2k
views
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.
- 113
0
votes
2
answers
457
views
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
182
views
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}. ...
- 11
0
votes
1
answer
89
views
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 ...
- 163