Questions tagged [bad-wiring]

A tag for questions about, or involving systems that are not using proper connections, components, or potentially dangerous circuitry.

Filter by
Sorted by
Tagged with
1 vote
1 answer
126 views

Relay with bypass switches haywire

The lamps are normally operated by relays. When the relay or relay driving circuit fails totally, the bypass switches are to be used as fail-safe to operate the lamps. The key operated switch which is ...
Kumaran's user avatar
  • 33
0 votes
2 answers
63 views

Is it safe to leave cut wires on a rotary phone circuit board?

I'm trying to make an audio guestbook for my wedding using a rotary telephone. A tutorial showed what wires I need, so I assumed the rest of the wires on the circuit board, I could get rid of. I ...
samfordii 's user avatar
0 votes
2 answers
182 views

Creating a 10MHz clock grid

I have a round surface of 1.5 meters in diameter that contains many electronics. What I would like to do is distribute a 10MHz 3.3V clock signal from Teensy 4.0 across the table for 200 ADCs to access ...
Gabriel's user avatar
  • 55
0 votes
1 answer
442 views

Disconnected wire still lit Tester turns on

I have multiple wires going through an electrical PVC conduit. Two phase wire carrying 220v AC of 1.5mm gauge. Two neutral wire carrying of 1.5 mm gauge. One wire for earthing (grounding) of 1 mm ...
Gaurav Saxena's user avatar
0 votes
1 answer
73 views

Consequences for invalid BMS wire and its diagnosis

While re-assembling the 16S BMS, I didn't notice that the socket for one 8s pack was different from the socket for the other 8s pack until I connected the plug (image 4) to the battery tape, when ...
ceph3us's user avatar
  • 101
0 votes
5 answers
588 views

How to safely *temporarily* wire 120v?

I am wondering if there is any device to safely create a wire connection? More specifically, here is my most recent situation: troubleshooting a noisy 120V electric motor (fireplace blower). The motor ...
wild coast's user avatar
0 votes
0 answers
88 views

Wiring of HDMI Extender

I'm trying to work on a HDMI extender The purpose is to single out the DDC lines so I can set the default display mode. (plug the male connector into the monitor and the hdmi cable from my laptop into ...
Larry Lee's user avatar
2 votes
0 answers
118 views

Is this USB Hub 3.0+2.0 hybrid safe to use?

So I just bought a USB 3.0+2.0 hub hybrid. When I check the PCB, the pin out is new to me (see photo). From host, two of the USB 2.0 data lines (red lines) went straight to the hub IC, then from the ...
Milk Boy's user avatar
-2 votes
2 answers
817 views

Why would test screwdriver light be dimmed? [closed]

So the wiring in my flat is catastriphic. Some things are grounded and some are connected to neutral. Bunch of switches that don't do anything. Open wires because there was probably a switch there ...
Anže 's user avatar
-2 votes
2 answers
126 views

Before build: Will this circuit work, or have I overlooked something?

Some friends and I have given ourselves the goal of building a unidirectional speaker. We bought the necessary components and electronic parts. Before starting to connect everything we wanted an ...
Antonin Keuck's user avatar
0 votes
1 answer
243 views

A/C voltage in the air? [closed]

I've been building a counter top dishwasher and just noticed that my sink is kind of grounded, around 30Megaohms resistance but 120V. While checking that I also noticed the air near metal in my ...
Dftbaoso's user avatar
0 votes
1 answer
125 views

Bad Residential Wiring - Dead circuits and circuits go on and off randomly [closed]

We moved into a home that is about 30 years old ten years ago. Our hallway lights are on a a circuit that is usually dead, but occasionally comes on for a few minutes or so, sometimes a few hours. ...
react_or_angluar's user avatar
0 votes
1 answer
124 views

Connecting a blind cable to electrical system [closed]

I am trying to connect a blind cable, (cable that doesn't have any end point connected to the grid), to the grid. This is how electrical wiring looks like. X's are lamps. and black lines in the first ...
sanjihan's user avatar
  • 139
1 vote
3 answers
251 views

How do I test grounding/lightning protection?

I manage IT for several clients in Central Florida, where we have quite a lot of lightning (the most in the U.S.). I have one client that has trouble keeping electronic devices alive. We have replaced ...
Gene McCulley's user avatar
2 votes
2 answers
1k views

Led ON on Spike Guard Even When Switch is OFF [closed]

I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the ...
iwtga's user avatar
  • 33
4 votes
2 answers
722 views

Is it possible that an outlet can kill AC motors?

I have two recently dead tower fans. The first, I've had for over 6 months, no problems. Recently, I moved it to a new room an plugged it into a different outlet. It died within a day: it seems to be ...
Michoel's user avatar
  • 161
0 votes
1 answer
1k views

Generator to Main changeover issue RCCB not moving up

RCCB not moving to up position while DG to EB ( generator to mains) changeover. I live in a community where we have almost 1200 apartments in India which will serve power through generators when the ...
SmartestVEGA's user avatar
0 votes
0 answers
161 views

wiring for my timer switch

I'm trying to wire as per the following wiring diagram. I completed wiring as below, and timer is switching on, but at the programmed time, light is not switching on, anything wrong with wiring. See ...
SmartestVEGA's user avatar
0 votes
1 answer
171 views

Wiring confusion in joining two cables with 5.5 x 2.1 mm DC male ends, please explain

I've got a 12V powerbank that I would like to use with a 12v device. The power bank output and the device both require 5.5 x 2.1mm male plugs. I've actually got some random cables and have found two ...
McMath's user avatar
  • 15
1 vote
3 answers
3k views

Is it safe for a screw at the terminal block to have multiple wires with fork connector end connected to it?

I have a DC-DC converter (24v to 12v) that has terminal block at its input and output terminal. To understand it better, I've attached the drawing of the converter found in its datasheet. Problem: ...
Shuan's user avatar
  • 13
1 vote
1 answer
2k views

Ground wire appears live despite not being connected on either end

I have decided to add another plug outlet near an existing blind outlet box. Unfortunately I've found that the existing one doesn't have ground since it's an old building, but that's a problem for ...
Sašo's user avatar
  • 145
0 votes
1 answer
106 views

Custom USB Y cable [duplicate]

I am creating a custom dual female USB Y cable for a hardware modification project in a USB mouse. I have the wiring set up as shown, is it correct? RED, WHITE, BLACK, GREEN, THICK BLACK from female ...
Abdel Seaf's user avatar
0 votes
1 answer
868 views

How can I use two output wires as one?

Sorry about the novice question. At the moment I am using an op-amp (http://www.ti.com/lit/ds/symlink/lm224-n.pdf) to boost my analog load gauge sensor output. The op-amp takes two inputs and gives ...
Blundell's user avatar
  • 161
0 votes
1 answer
2k views

Wiring on-off switch with resistor to SoC

Please note: although this question involves a Raspberry Pi (hereafter RPi), it is really a pure electronics question at heart! I am trying to connect my RPi 1 Model A to a breadboard with a single, ...
smeeb's user avatar
  • 787
-1 votes
1 answer
15k views

What happens if a positive and negative wire touches while connected to a speaker? [closed]

Would it just give feedback? Or have negative effects on the speaker itself?
Starboi Seon's user avatar
2 votes
2 answers
4k views

Soldering thin leads of a thermocouple

I have a thermocouple with me which is custom made and its leads are very thin. It has a diameter of 0.19 mm and this has to be soldered to a chip (Max6675). This setup will be placed on a harsh ...
Vish_evo's user avatar
  • 209
16 votes
3 answers
37k views

How far can mains voltage arc in air?

I wondered this while soldering a mains voltage circuit board and was surprised by how close together the traces were. It has obvious implications in design of electrical plugs, and the proximity of ...
M_M's user avatar
  • 293
2 votes
1 answer
2k views

Un-insulated Ground wire in USB cable

I am attempting to put a switch between the Data + and the ground wires in a USB cable. Now that I have cut open the USB cable, it does not seem to match any of the pinout diagrams I can find online. ...
Tom McElroy's user avatar
0 votes
1 answer
1k views

Motor wiring problem

I have a bit of a problem correctly wiring up the motor on a piece of industrial equipment that was ordered from China. When ordering I was told that it would run off of a three phase supply. I've ...
Daniel's user avatar
  • 1
2 votes
1 answer
907 views

Grounding conductor has a non-zero voltage (i.e. with respect to "true" ground). Why?

We're building a new house and I'm not confident with the skills of the electrician who installed the receptacles. In our country, residential structures are supplied with 240 V, 60 Hz (single phase). ...
Darwin Bautista's user avatar
1 vote
1 answer
10k views

measuring resistance in a wire with a short

A couple of questions: I have a camper trailer that apparently has a dead short in either the positive or ground wires between the battery and the fuse panel. Someone told me to measure the ...
longtimealaskan's user avatar
3 votes
6 answers
12k views

Why is it not advisable to fuse the neutral

I have been doing some research on this question. The answer I get most of the time is that this is for safety reasons. That there can be no current in the neutral that didn't come from the live. If ...
user104474's user avatar
27 votes
6 answers
9k views

How do I describe this circuit?

simulate this circuit – Schematic created using CircuitLab Yes, this circuit diagram is correct. No, I did not design it. How do I describe this circuit in words? I thought about "a switch and ...
dpdt's user avatar
  • 1,717
-1 votes
1 answer
504 views

How to wire ADC (AD7738)

I'm trying to make sure I have it wired up properly, because I am seeing very odd outputs from my DOUT (MISO) pin and I think it may be connected to my wiring. On a rare occasion I get a good set of ...
scarlso9's user avatar
  • 315
5 votes
2 answers
2k views

Salvage data from a reverse connected thermocouple?

My SAE Baja team had a competition this past weekend, and we were using some thermocouples in order to get some temperature data on the drivetrain and engine. They were hooked up right before the ...
SuperNintendoChalmer's user avatar
2 votes
3 answers
2k views

Does an inexpensive screw terminal "expansion strip" exist?

I've got a messy security panel that needs cleaning up badly, as I need to connect another PCB for remote access and can't get the wires to reliably stay in place: If you look at the black, red, ...
Dave's user avatar
  • 3,800