Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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377 views

Unplugging a router from the wall socket

When the internet appears to have crashed, the service provider invariably gives this advice as a first line remedy: unplug the router from the wall socket, then wait 5 minutes, then plug it back in. ...
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0answers
48 views

current voltage calcultion of LED stacks [on hold]

Sir, please provide the details on how to calculate current voltage of LED stacks for ITI students(INDIA)
0
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1answer
87 views

AC voltage gets mixed with DC

I am using ATS (automatic start) for my generator. Its programmable IC goes out of work after 2 or 3 days and I have replaced 3 ATS card. My card supplier says that you are somehow getting AC voltage ...
0
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2answers
40 views

Resistor Magnitudes in Voltage Dividers

I recently made a voltage divider that uses a 10 ohm (top) and ~90 ohm (bottom) to divide a source voltage of 5v to 4.5v. The resistor values I used was somewhat arbitrary, in that I just picked a ...
1
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2answers
46 views

no-load voltage on ac-dc adapter

I recently acquired a toy that uses this transformer: but since I live in a 220V area, I cannot use it directly. I have this generic AC-DC adapter: which in theory is all I need because it has a ...
1
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1answer
37 views

Question on 3DS power adapters, minor voltage difference [duplicate]

I am going to be traveling overseas and bringing my Nintendo 3DS which the adapter outputs DC 4.6V 900mA. I found an unofficial USB cable to charge it and I was curious if the minor variance in the ...
0
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1answer
38 views

Connecting separately powered devices via serial

I have a small issue connecting an FTDI USB to 5V Serial adapter to an externally powered PIC microcontroller. They are connected via serial connection. The USB connection powered the FTDI and a ...
0
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0answers
25 views

2.Can I use power supply with specs 'out: +5V - 2.5A / in: ~50-60Hz 0.5A' work with 'USB 2.0 HD 500GB’ requiring 'out: 5V - 2.5A / in: ~50-60Hz 0.4A'? [duplicate]

Info about external Harddrive (HD): https://www.lacie.com/support/support_manifest.htm?pid=11085 This is a different question than my 1st one. The difference is: - my 2nd Question: 'out: +5V - ...
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0answers
20 views
3
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3answers
101 views

Why would the output voltage of a 5V SMPS (USB charger) increase with load?

I've been using a USB voltage/current measurement device to evaluate power consumption of USB devices and performance of USB chargers and batteries. Most of the USB power supplies I've used are ...
0
votes
2answers
97 views

Amplify DC Voltage to be used like supply to 2Km

Is there something to help me to reach this goal? I want to turn on a device away from the voltage source to 2 Kilometers, my device operates at 24VDC or 48VDC / 35W. I need to know how is possible ...
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0answers
50 views

Handling overvoltage in 12 volt system

I have a small 12v system for my cottage with a solar panel, charge regulator and a battery. Mostly used to charge phones and to drive a few lights. Now I'm planning to connect a inductive load ...
-2
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1answer
48 views

where can i find voltage sensors [on hold]

I am shopping for voltage sensors to measure voltage between 0 and 300V and I cannot find a sensor which uses voltage supply of 5V . Any ideas I only have 5v suuply voltage
3
votes
3answers
180 views

Measuring Voltage across a resistor

I am taking my first steps into learning about electronics as a hobbyist and I am struggling to understand something about resistance. I have read about Ohm's law and it seems fairly straightforward ...
1
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1answer
97 views

How is line voltage measured?

When people say that the line voltage in the US is 120 volts, do they mean amplitude, Vpp or Vrms?
0
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1answer
41 views

Elements of an AC expression

I am doing some coursework and research on AC theory and currently exploring the below expression: $$V= 100sin(100\pi t) + 60sin(300 \pi t - \pi/2) + 30sin(600 \pi t + \pi/2)$$ I need to find the: ...
-1
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1answer
53 views

200mA constant current @ 6V from 12V battery [closed]

I have made a digital speedometer with a Hall-effect sensor, but while the battery is discharging, sensor output also changes. I need a circuit that consumes the entire battery capacity, that is, from ...
0
votes
2answers
145 views

Using a shunt cap to create a delay - good idea? [closed]

simulate this circuit – Schematic created using CircuitLab C1 is a decoupling capacitor. If the input of U1 is experiencing undesired phase shift, can a decoupling capacitor correct the ...
0
votes
1answer
84 views

Minimum number of capacitors

I require a capacitance of 2×10^-6 F in a circuit across a potential difference of 1kV . I have a large number of 1×10^-6 F is available which can each withstand a potential of 400V. Suggest a ...
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2answers
92 views

What is the audio voltage of an android phone?

For a project I am currently working on, I need to use the audio output of an android device. Is there a standard max voltage?
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4answers
126 views

Voltage decreases on higher current

I have a circuit composed of Arduino Mini Pro 3.3V and GY-GPS6MV2 (GPS Ublox NEO-6M). I have tried to power it with 3 different sources: 3xAA NiMH in serie connected to RAW pin of Arduino and using ...
0
votes
1answer
93 views

how to provide a steady voltage, in case of source voltage drop due to heavy consumers in the circuit

I am designing an arduino circuit in which the power source is a battery connected to some heavy current consumers, these consumers are intended to work for short time and infrequently, my question is ...
0
votes
3answers
72 views

Battery current reduction [duplicate]

I have made this circuit: Now I am trying to use this circuit in my bike. My bike has a 12V 9amp battery and while charging (bike running), the voltage fluctuates from 12V to 20V. To power this ...
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2answers
29 views

Control automotive AC switch via TPS voltage

The A/C compressor is engaged via a single wire that comes from the 'A/C' button on the dash board. I want the A/C button to disengage when the throttle is at 50%. The throttle position sensor (TPS) ...
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6answers
153 views

How can voltage actually exist/change if electricity can't actually speed up or slow down? [duplicate]

PLEASE NOTE: No this question does not already have an answer at the link posted above. This question was closed by individuals who didn't read it, nor the comments underneath it. I am new to ...
4
votes
6answers
181 views

Given a known power supply, what are safe ranges for the volts/amps/ohms of connected components? [duplicate]

I'm new to hardware and am coming from a software background. I have an SoC that will be powered by a supply generating 5V and 1A. I'm trying to figure out what are the safe ranges of volts/amps/ohms ...
0
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0answers
54 views

Low current (~100ma) buck voltage converter simple, low cost options (48V to 12V)

I have 48V AC-DC power supply that I use to drive high power LED drivers. I also want to use the same 48V input to power a 12V fan and Arduino Pro Mini. Fan is rated at 0.25A but I could do without ...
0
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3answers
94 views

With a transformer center tap, why are the two resulting circuits out of phase by 180*?

I'm trying to understand how the power in my home works, and the part I'm having trouble with specifically is why in the step-down service transformer, the resulting out-of-phase 120V "hot" lines are ...
2
votes
1answer
76 views

From node to node, do units of charge lose energy over a constant period of time?

I have the following circuit set up on a breadboard, and I've measured current and voltage between each node. Current everywhere is .02A, as expected, and my resistor came out to 217R. simulate ...
4
votes
3answers
185 views

Thermistor control of peltier voltage with Arduino (for DSLR chill box project)

I am mildly familiar with electronics, mostly from playing around with electronics kits as a kid. That was a long time ago, though, maybe as much as 20 years ago. I am currently working on a cold or ...
0
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1answer
55 views

I want to adapt a VFD

If I feed single phase electricity into a 3 phase input VFD, I know it needs to be derated on the output by about 50%, but how does it cope with the difference in voltage, as rectified 230v rms gives ...
0
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1answer
28 views

Slow fade option with an LM3914 IC

I have been researching the best circuit design for LED VU meters and a popular choice is the LM3914/5/6 series of IC's. You can find may videos of these chips used in videos on YouTube, as an ...
2
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1answer
75 views

Why / how does reactive power help improve voltage quality?

This question is related to my previous question that Olin provided a great answer to. Note that this question is about transmission and distribution systems, not electronics. I believe the claims ...
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4answers
89 views

MiniQuadcopter ESC connection

I have a picture here, sorry if it's ugly .. but let's think, they are my ESCs for my mini-quadcopter. My mini quadcopter is 3d printed, and as much as possible, I don't want to use bullet connectors ...
1
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6answers
168 views

Why do cables and batteries have a positive and a negative side?

I am a beginner in electronics, mostly self-taught. If electrons are negatively charged and are the reason for electric current why is there a 'positive' side on a battery and negative one? Don't ...
0
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2answers
71 views

What should I use for a 3.3 voltage reference that sinks maximum of 1mA?

I am in search for stable and precise 3.3 voltage reference IC. I am using it for the temperature sensor application which only sinks 1mA at max. Can someone suggest me a best component/IC for this ...
0
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1answer
63 views

Female Rectangular Headers with Long Pins (Pass-through style)

Female Rectangular Headers with long pins (passthrough style) are used to stack/connect an Arduino shield board to the Arduino board. 1x8 and 1x6 position headers are easily found. Problem: However ...
0
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1answer
78 views

Protecting a wireless router from voltage fluctuation

Background: I have a wireless router ASUS DSL_N12U. Input voltage and current is 12V , 1.5A respectively. I also have an Inverter (works on three modes: Solar, Battery, Mains) at my home. Problem: ...
0
votes
1answer
87 views

Can DC voltage be divided?

I have got an old camera that runs on 7.2V (2 cell li-ion). I only have a 4 cell li-ion battery. Is it possible to divide the voltage without using a DC-AC converter and a transformer? I have looked ...
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3answers
122 views

Convert 0 to -150V DC to 0 to 3.3V

I have a signal that gives spikes up to negative 150V. I need to be able to determine these spikes using MCU that can sens 0 to 3.3V. How can i adjust a signal so that it doesnt fry my MCU. It should ...
1
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1answer
121 views

Where does 264Vac come from?

Power supplies often accept an input range of 90-264Vac. I am wondering where the 264 comes from. A couple of random examples from power supplies available: 85 - 264 Vac input range (100 - 240 Vac ...
1
vote
2answers
84 views

Best way to lower a signal voltage

I'm interacting with a computer and the return high (1) is at 12V but I need it to ~5V. What is the best way to lower the voltage without affecting the signal (serial) ? I already thought of a voltage ...
0
votes
1answer
52 views

Battery pack for DSLR coupler

I am planning to make a battery pack, by using rechargable batteries, that i can use to power my DC-coupler for my DSLR camera. (Ref. Image) On my original camera battery it says 7.4V 1.2A but i ...
0
votes
6answers
77 views

How do I figure out the exact voltage and current needed for a part?

Whenever I look for parts in my local electronics store, I come across parts(e.g a speaker), that have just a power rating stated(e.g 2W). While I know how to calculate power,voltage, resistance etc, ...
8
votes
2answers
265 views

Why does reactive power affect voltage?

Why does reactive power influence the voltage? Suppose you have a (weak) power system with a large reactive load. If you suddenly disconnect the load, you would experience a peak in the voltage. Is ...
2
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1answer
54 views

12V motor running with 24V L293D H-bridge

I have two 12V motors (300 RPM) running from a L293D H-bridge circuit. I find that the speed when I provide 12V is not satisfactory. Will it damage the 12V motors if I provide 18V or 24V? Will they go ...
0
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1answer
59 views

Connect two boards together after removing Screw Terminals

An adapter board (to a card edge connector like PCI Express x1) is needed to be designed to for the breakout board below. This should involve replacing the board's screw terminals with some male ...
1
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2answers
85 views

Watts in Solar Panels

How does the amount of watts affect a solar array? The solar array I found is 14 W, so what would I encounter if I purchased an lower/higher wattage? I'm going to purchase an array to charge my ...
0
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0answers
35 views

DIY Power bank for router? [duplicate]

I'm an electronics enthusiast living in a country with a lot of power cuts, especially through the summer. I want to build a 9V <1A DC power bank for my internet router running on a AC->DC power ...
0
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1answer
84 views

Buffering Input Signal - Op Amp Alternatives

I need to buffer a 0-5V signal that is coming from a resistor network and being fed into an IC. When I feed it directly to the IC there is a loading effect and the value is changed specifically at 0V ...