39 votes
Accepted

What kind of socket is that?

This is KN-4A socket. Widely used in Eastern bloc countries in many types of electric equipment with a motor, mostly in sewing machines. What is important - this socket is not provided for powering ...
Jakub Rakus's user avatar
  • 2,235
32 votes
Accepted

Are DIP sockets against overheating worth the cost?

If you are not going to swap / change / reprogram your ICs just solder them. I have never overheated any DIP IC during the soldering. It is not easy to overheat them. Maybe 40 years ago ICs were more ...
0___________'s user avatar
  • 2,575
24 votes

Are DIP sockets against overheating worth the cost?

If you're in a design stage, a socket can turn a real pain in the neck into a momentary problem, allowing you to swap out that microcontroller with, say, a burned out DIO, with a brand new one, in ...
Scott Seidman's user avatar
20 votes

Are DIP sockets against overheating worth the cost?

If you are skilled in soldering, overheating the DIP package while soldering shouldn't be a problem. Also, the sockets can introduce problems themselves due to bad contact. Just keep the soldering ...
Manu3l0us's user avatar
  • 1,359
17 votes

Are DIP sockets against overheating worth the cost?

Breaking the chip due to overheating during soldering should be very rare. However, if you have the chip soldered down and end up breaking it during testing, it is very helpful to know this trick: ...
jpa's user avatar
  • 8,442
17 votes

Why do EU electrical sockets/plugs have two pins for grounding?

Figure 1. Schuko sockets. (Image source: Bran.) If you are referring to these sockets the dual earth pins give balance pressure on the plug which would otherwise be forced to upwards or downwards ...
Transistor's user avatar
  • 176k
11 votes

Are DIP sockets against overheating worth the cost?

Good answers here already... I'll add my two cents worth. ( Though I guess that's a nickel now we ditched the penny in Canada. ) When prototyping the first go around of a board and your confidence ...
Trevor_G's user avatar
  • 46.7k
11 votes

Are DIP sockets against overheating worth the cost?

I've broken many more ICs trying to pry them from DIP sockets than from heat or ESD damage from soldering directly. Even using a chip extractor can be risky. That said, in the analog world DIP ...
calcium3000's user avatar
  • 2,516
11 votes
Accepted

Do dead CFL or LED light bulbs consume power and is it safe to leave them mounted?

There's different way these things can fail, and in most, they might still be using power. I've seen all three: failure modes where the bulb "shut down" and used totally insignificant amount of ...
Marcus Müller's user avatar
10 votes
Accepted

If a light socket only has 2 connections, how can they sell 3 prong light socket adapters?

The seller is in China. They can sell and deliver anything you want to buy, even if a product is dangerous or fake. They are not guaranteed to comply with any local safety regulations and have not ...
Justme's user avatar
  • 148k
9 votes

Why do EU electrical sockets/plugs have two pins for grounding?

Your claim is not true. EU socket/plug standard is a combination of almost all older standards in the EU. It was design that german DIN standard plugs are somewhat compatible with italian or french ...
Crowley's user avatar
  • 379
8 votes

Why do EU electrical sockets/plugs have two pins for grounding?

Two pins is more safe than one pin. And it makes the design symmetric, so it can be connected in any orientation.
Justme's user avatar
  • 148k
8 votes

What is the name for this connector socket pin configuration?

It's a 5-pin microphone connector. There is no central pin. That's a chassis-ground lug in the centre, attached to the connector body, to which the shields are to be connected. They are still being ...
vu2nan's user avatar
  • 18.3k
7 votes
Accepted

Why were hobbyists advised to socket ICs before, but not now?

Paul I'm going to go out on a limb here and try to answer this. In my experience, the 80's era and prior did use sockets quite often for everything from IC's to transistors. There may have been ...
rdtsc's user avatar
  • 16.2k
7 votes
Accepted

Help with identifying a PCB header connector

That header is a Molex 2.50mm pitch SPOX wire to board header system. There are also several other manufacturers that make clones of these. Here is the Molex data sheet for the 4-pin shrouded PC mount ...
Michael Karas's user avatar
7 votes
Accepted

Same type of jack - different current ratings

High-current barrel connectors are tricky. Generally the current capacity is determined by contact area between two mating surfaces. More area means more current. Cheap barrel receptacle (jacks) ...
Ale..chenski's user avatar
  • 40.5k
7 votes
Accepted

For electrical outlets that have on/off switches, is energy sent to the socket when nothing is connected to it but the switch is on?

A switched outlet with nothing plugged into the outlet will generally not consume any power when the switch is turned on. There are a few cases where this may not be totally true. Some outlets may ...
Michael Karas's user avatar
6 votes

Are DIP sockets against overheating worth the cost?

Using socket packages have some cons and pros. Usually with the cost of integrated circuits rising, it is good general advice to maintain the chip for the next time use. But sockets, most often cheap ...
dirac16's user avatar
  • 1,794
6 votes

Are DIP sockets against overheating worth the cost?

In 10 years of working in the microcontroller world, I've never used a socket and never regretted it. The risk of having a bad contact in a socket is real. Old computers are notoriously unreliable ...
Mark Lakata's user avatar
6 votes
Accepted

Always-on socket in-between a 2-way switch?

If you have the neutral then yes. Use a SPDT relay with the common contact on the socket, NO on L2, NC on L1 and control coils connected to L2&N. When L2 is energized, the contact will switch the ...
ScienceGeyser's user avatar
6 votes
Accepted

Can I use this US extension cord in Europe?

You could get as many “no” as “yes” answers. Will it work? Sure. Should you use it? Probably not. No, this product is not CE marked, its importation is actually illegal. Yes, it is rated for 30 A, ...
jcaron's user avatar
  • 2,064
6 votes
Accepted

Strange new power supply socket effect

If you can't plug it in in the other orientation, then it is polarized plug, and you are dependent on the socket being wired the way the strip expects it. It might have been unsafe even in the country ...
Justme's user avatar
  • 148k
6 votes
Accepted

Earth pin in a 3-pin mains plug

The plug is a European-wide CEE 7/7 plug, which is often (somewhat generically) called just the tradename "Schuko" even though there are variants. It is designed to mate with either the ...
jonathanjo's user avatar
6 votes
Accepted

What is the name of this green 2-pole DC power connector?

Looks like a phoenix COMBICON MSTBVA series part, (likely a P/N: 1755736). A few matching parts are listed at the bottom of the linked page. Obviously the matching part will need to be the same series ...
Nedd's user avatar
  • 10.4k
6 votes
Accepted

When selecting an IC DIP socket for a DIP 20-pin microcontroller, should the DIP socket have the same number of positions and row distance as the IC?

DIP packages are supplied with the leads spread beyond the proper spacing for footprints or sockets. The lead spacing should be 0.3" (7.62mm) for that package. They are intended to be slightly ...
Spehro Pefhany's user avatar
5 votes

Hot and neutral have similar voltage to ground - finding the problem

Yes, you have a problem. Basically, your "ground" is floating with respect to neutral. This suggests a failed connection, and this is potentially life-threatening.
WhatRoughBeast's user avatar
5 votes
Accepted

IEC vs. UL current rating

Just because it was not tested to that standard does not mean it won't safely operate at that current. They may not bother testing above 10A, for example, because 10A is a lot of power at 230VAC. Or ...
Spehro Pefhany's user avatar
5 votes

Same type of jack - different current ratings

The female connector includes a spring, which puts pressure on the contacts. The higher the pressure, the higher the current the connector can be rated for. The spring used in the females you've seen ...
Neil_UK's user avatar
  • 166k
5 votes

When I checking the hot terminal in the socket, multimeter shows the current through me?

This is a really stupid thing to do. You are measuring the difference in voltage between the mains and the ground through your body's capacitance. You have not given a make and model of the ...
Transistor's user avatar
  • 176k
5 votes

What type of connector is this 3-pin socket marked "DC24V" on a printer?

It's a fairly unique hole pattern, and the only connector I found at a cursory glance that matches is the Kycon KPJX-3S: It is a 48VDC-rated power jack, and the applications listed in the datasheet ...
DerStrom8's user avatar
  • 21.3k

Only top scored, non community-wiki answers of a minimum length are eligible