Questions tagged [contact]

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2answers
71 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 ...
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2answers
142 views
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1answer
37 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 ...
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1answer
75 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 ...
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2answers
126 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: ...
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2answers
72 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 ...
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1answer
25 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 ...
0
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1answer
37 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 ...
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0answers
22 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 ...
1
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2answers
79 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, ...
1
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1answer
72 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
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1answer
72 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 ...
4
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1answer
195 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 ...
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2answers
90 views

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
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1answer
78 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
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5answers
7k 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?
3
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1answer
310 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, ...
0
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1answer
43 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 ...
0
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1answer
129 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
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2answers
65 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 ...
0
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0answers
60 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 ...
2
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1answer
399 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 ...
1
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2answers
3k 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 ...
0
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3answers
149 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 ...
5
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3answers
607 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.
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2answers
217 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
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1answer
89 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}. ...
0
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1answer
50 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 ...
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1answer
3k 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 ...
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0answers
1k 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 ...
2
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0answers
320 views

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 ...
2
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1answer
407 views

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 ...
1
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1answer
91 views

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 ...
10
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4answers
451 views

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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3answers
175 views

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 ...
9
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4answers
426 views

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 ...
0
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1answer
2k views

Difference between Rated Load & Max. Switching Voltage on Relay Contacts

Under the 'contact ratings' of a relay datasheet, there is a row for rated load, which specifies a 10A 30VDC load on both NO and NC contacts. There is another row which is the max. switching voltage ...
1
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3answers
204 views

Does the contact pad need to match the footprint shape of the SMD

If the contact pad is larger than the footprint, or has a different shape but is still large enough to make full contact with the SMD, will this lead to problems during reflow soldering? I am ...
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3answers
1k views

What is the purpose of the spring used in point-contact transistor?

Below on the left side of the illustration there is a point-contact transistor which is the first transistor invented in 1947: It seems the symbol of BJT actually comes from this point-contact ...
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3answers
269 views

Detecting human body current with raspberry pi [closed]

I want to be able to detect on my raspberry when a human contact is made with a GPIO pin (or a cable linked to a pin). I am pretty sure it's possible (for example when i see this kind of projects : ...
1
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1answer
729 views

Why use more than one contact in VLSI layout?

I saw the following layout in one of the standard cell library provided to us by the University. In the layout, the yellow color diffusion layer is connected to blue color horizontal M1 metal layer ...
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2answers
370 views

piezo stereo preamp

I have found several projects on piezo preamps but I cant find anything that can run 2 piezo inputs to make it stereo and uses potentiometer to control volume gain etc. What I found is "Collin’s Lab: ...
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2answers
206 views

Can you extend a tact switch with wiring?

This might sound like a wierd question but could I, in theory extend a tact switch by soldering wiring to the slots and putting the switch elsewhere. Basically I ride a motorcycle and have heated ...
0
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1answer
463 views

How to release wire from a Eaton Moeller M22-CK10 NO contact block?

I am attempting to rewire a fan to a M22-CK10 contact block. The device is shown below: My first thought was to push in the metal contacts above the red wire on the left. When that didn't work I ...
0
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3answers
694 views

How do I secure the connection to this battery (CR1616)?

I'm replacing the batter in a Game Boy Advance game cartridge. (Don't mind the bad solder job; the iron isn't handling well.) I've gotten it to work, but the battery is held down with very little ...
0
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2answers
2k views

Switch Current and Voltage Ratings

On a datasheet for a single pole, multiple contact switch, I see that there are a few contact ratings: non-switching (50VDC, 100mA), switching (5VDC, 100mA) and minimum (20mVDC, 1uA). What are these ...
2
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2answers
921 views

working principles of Electronic Throttle Body

Could someone shed some light on a working principle of this Electronic Throttle Body from MagnetiMarelli? (Found in BMW R1200GS motorcycle). Seems to be contactless feedback via the 4 tiny pins. ...
1
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2answers
1k views

My oscillator of 40Khz is not giving 40Khz signal at the output

I am putting a 40Khz crystal oscillator with 33Pf load capacitors. The problem I am facing is that as soon as I switch on the circuit, it is not giving me the pulse but as soon as i touch a metal or ...
2
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1answer
4k views

Limit switch on reversing motor

First- I've read through various posts about similar topics, looked at schematics, and I couldn't quite find something that matched this particular issue, here goes.. Cliff notes at the bottom... I'...
3
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2answers
3k views

Which surface finish for edge connector plating to increase number of mating cycles with sliding spring contact?

I'd wish to insert a small 12x33mm PCB into a USB slot multiple times a day. Because of that high number of expected mating cycles, the surface finish of the edge connector should be chosen wisely. ...