Tagged Questions

5
votes
2answers
277 views

Can you send data usefully over one wire, literally one wire?

It is possible to design networking systems that only use two wires: one for data and one for a common ground. Examples include 1-wire and Pin&Play. These are called single wire systems because ...
1
vote
1answer
98 views

Tying multiple power supply grounds

I'm planning on a home automation system, and two sub-sections will be separated by (say) 100 feet. These will be connected by a low-amp, low-voltage data connection. To avoid running significant ...
7
votes
2answers
197 views

Grounding and why charge leakage occurs

A basic nugget of info is missing in my end-to-end picture of how grounding works and why it's important. When a voltage is applied in a circuit the electric current starts flowing (or the field ...
3
votes
1answer
120 views

Two power sources, common ground and noise

I'm having the following circuit: Where TWL6030 is a DC-DC buck converter and INA219 is a high side current sensing circuit. My problem is with the power sources,...
1
vote
1answer
121 views

Shared GND on 2 ATX Power Supplies

I'm constructing a custom(cheap) power supply, with digital current meters and such. I'm using 2 ATX power supplies to build it. I'm using 1 for the standard -12, -5, +3.3, +5, +12 outputs. I've ...
2
votes
2answers
350 views

Can we connect battery negative terminal to oscilloscope ground?

I want to test my setup with 200Ah battery and check the outputs on oscilloscope. While testing can I connect battery ground to the oscilloscope ground? Is there any safety risk, as oscilloscope ...
0
votes
1answer
262 views

Laptop charger with broken ground prong [closed]

I have an old house (1927) that has been completely renovated, but all the plugs in the living room are 2 pronged. I have a charger that had the ground prong broken off. I want to know if it's bad ...
5
votes
3answers
200 views

Separating the Grounds for 2 Chips

I am working on a design that requires Two Chips - Energy measuring chip (for analogue measurement) and a MCU (for connecting to a communication peripherals, and connected to a PC.) Both Chips is to ...
4
votes
1answer
583 views

AC->DC supply, how to deal with chassis ground being connected to digital ground?

I have an external triple-output AC-DC supply with the following output pinout: On the power supply, "ground" (pin 2) is internally connected to the ground wire of the mains plug. I'll refer to it ...
2
votes
3answers
409 views

How to ground a vintage device that was powered without a ground?

This is a follow-up to Is there a mathematical relationship between the battery AH rating, and that of the transformer in the charger Since that post I've uncovered a vintage battery charger ...
5
votes
3answers
314 views

Why would a power supply unit with insulating case and galvanic separation need a grounded power cord?

Recently I witnessed an external IBM laptor power supply that looked like a usual switched-mode power brick (rather small and lightweight for it more than 50 watts power) in plastic case but had a ...
7
votes
4answers
536 views

How to know that I am grounded with an anti-static wrist strap?

The resistance of my Belkin anti-static wrist strap shows 0.983, but how do I know that I am grounded by attaching it to computer power supply alone? See the picture below. How do I know if that ...
1
vote
3answers
1k views

Sensor reading is chaotic when Arduino is powered by laptop unplugged

I have a Sharp proximity sensor connected to my Arduino (analog input). This Arduino is connected and powered through USB by a laptop. When the laptop is plugged in, everything works fine (I get ...
3
votes
1answer
185 views

Disconnecting the Power Supply

random question about the process of disconnecting a power supply. Whenever I'm working in labs, I have always disconnected the +V terminal first because I've always been taught powering a chip ...
3
votes
1answer
858 views

Grounded Common AC-DC Power Supply Simple Circuit

I need an AC to DC converter circuit where it is safe to connect common to ground. My situation: I have a remote 120v->24v transformer. The 24v neutral is grounded. The DC circuitry is the only load ...
18
votes
4answers
2k views

When a battery is your power source, what is ground?

For the sake of not incorrectly connecting my power supply and damaging my board I'm going to ask a relatively dumb question. Is ground on my board the negative terminal on my battery? Explicitly ...
6
votes
2answers
264 views

Power and ground configuration in a schematic

I have a schematic for a commerical circuit board, and I was curious about the following: ...