Skip to main content

Questions tagged [contact]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
49 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 ...
Tempus Nomen's user avatar
0 votes
3 answers
150 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,...
bobuhito's user avatar
  • 554
1 vote
2 answers
172 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 ...
Mike More's user avatar
1 vote
0 answers
30 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 ...
pa_blo's user avatar
  • 11
-1 votes
1 answer
84 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 ...
digitalav's user avatar
0 votes
0 answers
73 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.
Teb Ara's user avatar
3 votes
3 answers
188 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 ...
kellogs's user avatar
  • 1,061
4 votes
1 answer
176 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. ...
slyx's user avatar
  • 221
0 votes
2 answers
105 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. ...
Gianfranco Di Domenico's user avatar
0 votes
0 answers
77 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 ...
Greenaum's user avatar
  • 310
1 vote
0 answers
50 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 ...
Daniel Gil's user avatar
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 ...
Dev Rajput's user avatar
4 votes
2 answers
950 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 ...
ZeroZ30o's user avatar
  • 155
2 votes
2 answers
344 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?
Coconut's user avatar
  • 87
0 votes
0 answers
156 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 ...
TQQQ's user avatar
  • 1,347
0 votes
1 answer
131 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 ...
elecrobot's user avatar
3 votes
1 answer
407 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 ...
Ankit Kumar Vishwakarma's user avatar
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 ...
DrAl's user avatar
  • 676
2 votes
1 answer
431 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 ...
Design4ec's user avatar
0 votes
2 answers
192 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 ...
Jeron Baffom's user avatar
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 ...
linuxfan says Reinstate Monica's user avatar
2 votes
2 answers
1k views

Why is that vias are generally made of tungsten while contact is made using aluminum?

From this thread: ...
hana's user avatar
  • 230
0 votes
1 answer
53 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 ...
user207787's user avatar
0 votes
1 answer
81 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 ...
ZeroZ30o's user avatar
  • 155
0 votes
2 answers
137 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: ...
Mark Tickner's user avatar
0 votes
2 answers
85 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 ...
Ibrahim Alshrif's user avatar
0 votes
1 answer
83 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 ...
AllenB's user avatar
  • 1
0 votes
1 answer
215 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 ...
Robert Ryder's user avatar
0 votes
0 answers
26 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 ...
user139731's user avatar
2 votes
2 answers
433 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, ...
Krack's user avatar
  • 49
1 vote
1 answer
86 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 ...
Rahul Vijayan's user avatar
1 vote
1 answer
88 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 ...
Mac D.'s user avatar
  • 23
4 votes
1 answer
298 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 ...
Kyle B's user avatar
  • 4,618
0 votes
2 answers
223 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 ...
glen hughes's user avatar
0 votes
1 answer
123 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 ...
Kevin Stevenson's user avatar
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?
user avatar
3 votes
1 answer
7k 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, ...
ben's user avatar
  • 199
0 votes
1 answer
59 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 ...
Martin's user avatar
  • 203
0 votes
2 answers
272 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 ...
JimS's user avatar
  • 1
1 vote
2 answers
133 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 ...
bandybabboon's user avatar
0 votes
0 answers
76 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 ...
Eduardo Cardoso's user avatar
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 ...
xeetsh's user avatar
  • 71
1 vote
2 answers
8k 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 ...
Amalnath Satyan's user avatar
0 votes
3 answers
499 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 ...
aaa's user avatar
  • 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.
user15847's user avatar
  • 113
0 votes
2 answers
424 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, ...
Curious George's user avatar
1 vote
1 answer
172 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}. ...
Aseem's user avatar
  • 11
0 votes
1 answer
83 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 ...
HackXIt's user avatar
  • 163
0 votes
1 answer
4k views

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 ...
lcpr's user avatar
  • 1
1 vote
0 answers
2k views

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 ...
Hearth's user avatar
  • 35.1k