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Questions tagged [bad-wiring]

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

0
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1answer
93 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 ...
0
votes
1answer
612 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, ...
-1
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1answer
5k 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?
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2answers
1k 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 ...
8
votes
3answers
8k 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 ...
2
votes
1answer
783 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. ...
0
votes
1answer
517 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 ...
3
votes
1answer
504 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). ...
0
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0answers
66 views

Neutral vs Ground (again) [duplicate]

This topic seems to have been repeated, but I'm not finding an answer that really answers my question. Just to get terminology down for this question. Neutral is the path that carries the return ...
1
vote
1answer
6k 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 ...
2
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5answers
5k 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 ...
27
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6answers
7k 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 ...
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votes
1answer
284 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 ...
4
votes
2answers
1k 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 ...
2
votes
3answers
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, ...