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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Which capacitor for DC blocking in audio applications?

Which capacitor (electrolytic, film, ceramic) do you use for DC blocking in audio applications? From what I have seen most people use electrolytic capacitors. But, also from power decoupling theory ...
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61 views

Volts vs voltage

As I have understood it voltage is electric potential difference while volts are just electric potential. So I can say that the negative end (ground) of a battery has many volts since there's a lot of ...
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28 views

Wattage & Transformer needed for George Foreman Grill in Thailand

I live in Thailand, where it is 220v-240v 50 hz. I am bringing a George Foreman Grill from the US to Thailand, and it will be 110v-120v. I am told it uses 1200 watts. I will only be using it for 10 ...
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3answers
95 views

What happens to voltage source if I take out both volt and current with separate circuit using diodes and then combine both separate circuits?

I have 3.8V and 1.2Ah battery. I will use a step up circuit that gives 5v and 200mA output using 2v in (from my battery). Then I will use blocking diode to take voltage only(5v) and I don't need ...
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72 views

Using transistors with different threshold voltages

I have an idea that requires switching based on one of three input voltages. The basic idea is to have three different circuit behaviours based on three different voltage inputs. I've been doing this ...
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111 views

What is the maximum voltage drop on an LDO?

I'm a long time lurker :) How do I tell what is the maximum voltage drop an LDO can handle? My mentor explained adjustable LDOs like this to me (paraphrased of course): "An LDO is essentially a ...
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1answer
45 views

Question about output current

I've got huge three-phase transformer, primaries are connected in Y configuration, secondaries in Delta, then goes to 6 diode bridge rectifier. Output is about 200 amp 52 VDC. In short, how many ohm ...
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4answers
82 views

Electric potential and the flow of electrons in a battery

I started reading about electricity a few days ago and there are some things that confuse me. What I want to ask about here is the apparent contradiction in two facts that I have read, they are: ...
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2answers
54 views

Determining which power supply is connected to our circuit?

I am designing a small dongle that will have features either enabled or disabled as a function of the supply voltage. I want the device to be low-power and run, for the most part, off a 3V coin-cell ...
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4answers
248 views

Why does temperature modify the characteristics of a diode?

Everyone knows that temperature affects every semiconductor device you can think of, and diodes are no exception. From the below graph, we can see that the temperature has marked effects on pn ...
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2answers
53 views

Connecting multiple devices which work on DC to a single adapter

I have 8 biometric devices which run on 12V 2 amps power supply. I have only one AC power source. Usually these devices are connected through individual power adapters. Now I cannot connect more ...
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2answers
42 views

Solar Panel + Controller + Diode to float LiPos

I have a few solar panels I wanted to play around with and charge some 18650s till I get a little more comfortable that I won’t blow something up. My main goal is to understand how to charge ...
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1answer
51 views

led voltage and current relationship via a driver

I am trying to understand what happens to the voltage supply to a high power LED when using a Constant Current LED Driver. Things I (think I) Know: -An LED has a certain range of operating ...
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2answers
67 views

What is the deal with input voltage?

Let me tell you right off the bat that I am new to electronics, more specifically the creating of electronics. I recently discovered a project that I would like to make, a pocket power supply(link at ...
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0answers
29 views

Earthing Leakage voltage in Thermofluide Boiler [on hold]

We have 6T Thermo Pac Boiler, In this Leakage earth problem, In between Neutral & Earth there is 89 VAC, For this we done following work. New Earthing Pit Prepare & connect with the system. ...
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0answers
24 views

Sensor Measuing both Volatge and Amps [closed]

What is the best sensor to measure both voltage and amps ?
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88 views

Measuring very low current

I have asked here a month ago regarding measurement of very low current. I was told that Amper-Meters today has this resistance in series that will cause a voltage drop, hence you can't measure a very ...
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2answers
37 views

Voltage regulator current consmption

Our pcb current consumption is less than 0.5mA . We use a 3.7v lithium battery, and the battery goes through voltage regulator ...
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3answers
82 views

Non-inverting op amp on breadboard isn't working

I have posted this before and I have another question. I just can't get this working on a breadboard. I don't know what I am doing wrong. My voltage source is from an Arduino UNO which outputs a 5 ...
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1answer
36 views

voltage mode vs current mode motor

I wanted to ask question regarding voltage vs current mode for a feedback control motor . Will operating in current mode have any effect on our torque values provided that we are keeping the speed ...
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1answer
32 views

Changing old batteries in handheld device and replacing the charger

I need them to power a small handheld soldering iron, which had an old battery that died. The original battery was NiCD 1200 mAh 2.4v I am replacing them with 2 NiMH-520rs in series First question: ...
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1answer
33 views

Replacing Power Board European Samsung TV's with an asian one [closed]

After a lightning strike, my European (Model UEXXC..) Samsung Tv is dead. I searched for a new Power Board and I found out that european boards cost 4 times more tha asian ones( Model UAXXC..). ...
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0answers
44 views

Jumper wire problem, getting wrong voltage

Hi all I have designed a circuit which takes 12v input and using PC817 opto coupler, it converts it into 3.3v. My further plan was to use this 3.3v as an input to PIC32 microcontroller. To make it ...
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1answer
46 views

About Fly back diodes and motors

so here's the situation, i have a motor and i am controlling it with a bunch of transistors and an arduino, so i think i need a flyback diode to protect the transistor and my arduino, problem is i am ...
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1answer
36 views

momentary voltage dropout

I have a phone answering machine which drops out on the frequent momentary power interruptions we experience in florida. It has an 11 volt 350 ma supply. all I want is something to momentarily bridge ...
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2answers
381 views

i have a 1000 volt dc power source with milliamp current. How do i downsize my voltage to 12/18 volts without downsizing current?

I have a 1000 volt DC power source with milliamp current. How do I downsize my voltage to 12/18 DC volts without downsizing current?
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1answer
72 views

Why is my piezo so innacurate? Is it just insensitive?

I'm trying to make a sound level display, simply to tell the user how loud nearby sounds are. The issue is this data, which I collected in a near silent environment (it's night, and I can't make out ...
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3answers
133 views

Why the diode has higher impact on dc characteristics than ac?

Consider this circuit which consists of a DC bias and an AC source connected with a diode and resistor: Source: Boylestad and Nashley book 11th ed. Using superposition theorem the circuit was ...
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1answer
443 views

Simple transistor circuit with unconnected gate pin acts strangely

My brother and I were playing around with some new transistors we ordered (2n7000 n-channel MOSFETs), trying to make a simple switching circuit: connect a switch, LED turns on; open the switch, LED ...
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1answer
57 views

Is potential difference is sufficient for charge/current flow?

Suppose there are two points A and B. A is having fewer electrons than B. That is,it is positive with respect to B.If these two points are connected by conductive wire will the current flow? If this ...
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2answers
58 views

DC Voltage Range Controller

I need to make a circuit that has a variant input between 0 and 9V. It starts with 0V then once it reaches 9V a switch closes and if voltage drops back and reaches 5V the switch opens up and stays ...
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1answer
59 views

Way to get high voltage from a watch battery

I'm creating a vary small device that need an high voltage around 50v. But because the device is really small like a pistol bullet, I can only use very small batteries like watch battery or button ...
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2answers
62 views

Will AVR stabilize the flow of current? [closed]

In our village, the power supply is unstable. Sometimes it goes weak, sometimes not. You can tell it by our bulbs, it goes dimmer when the power is weak. Our monitor now shows some green and red wires ...
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1answer
49 views

switching power redundancy

I have a load (LEDs) that draws 36V, 5A. The circuit is made in this way: Power Supply (AC-DC) -> LED Drivers (5 in parallel) -> LEDs (5 strips). What component I need to install if I want to add ...
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1answer
36 views

dropping a signal voltage proportional to signal

Basically i have a car that im installing at aftermarket ecu in, The tps signal is normally a 0-5v signal (varible resistor on a 5v output from the ecu) that the ecu uses for various things, However ...
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38 views

Plot Vx as a function of time

I am stuck with this question. According to my analysis Vx = -3V when Vin = 0V. But I cannot interpret the voltage at the gate since there is a voltage of 0V due to Vin and +3V from the capacitor. ...
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2answers
65 views

Switching regulator (TI LM2678) not working on load > 100mA

I am a (joung) programmeer and I recently began studying some electronics&AVR programming. I am trying to use a step down voltage regulator (LM2678-5.0) to transform battery voltage (9/12V) into ...
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1answer
59 views

Can I tell the voltage of High Power Transmission lines by its Type?

I am moving to Foster City, CA and am looking at an apartment about 550 feet from these power lines: ...
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2answers
154 views

Reasons for a voltage follower introducing voltage gain?

I'm using a 3130 op-amp as a voltage follower (unity gain buffer amplifier). However it is introducing voltage gain. It is wired the following way: This is then just fed into a simple low pass RC ...
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0answers
20 views

WM8904 sound card input voltage problem

I have an evaluation board(AT91SAM9N12-EK) running linux with WM8904 sound card. With normal input on its line in, I cannot hear anything. Like I plug my Laptop or Smartphone's line out into the ...
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1answer
58 views

Exceeding Maximum Voltage Rating of a BJT Transistor

I am wondering how the maximum voltage ratings of Vce and Vcb work for BJT transistors. Are they like MOSFETs in the way that the instant the maximum voltage is exceeded, they are damaged/destroyed? ...
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1answer
114 views

Two Port Circuit

I hope all are well. Please can you help me with the below, I have a idea of doing it but I am so confused in determining the correct ANSWER. I am using the linear and nonlinear text book by Leon O. ...
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1answer
105 views

Have I broken my Multimeter?

Firstly, I'll answer my own question by saying that I don't think I have broken it. However, is it possible I could have? (and also possibly, the power supply I was testing). I am quite new to ...
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1answer
317 views

Is there a reason for the shape surge arrests have?

Why do surge arrest typically looks like this ? I found one of the reason is to prevent ingress of water by using slippery rubber material but it does not explain the reason for the shape of the ...
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3answers
58 views

Sign of current through a voltage source

simulate this circuit – Schematic created using CircuitLab I am a total newbie to circuits, so please forgive my naivety. My question is the following: When I simulate the above circuit ...
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2answers
86 views

constant voltage drop at (relatively) high current

I'm making a power supply using some decade switches and resistors. The idea is to dial a voltage, much like a resistor substitution box, but get a voltage out instead of a resistance. I'm using the ...
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1answer
92 views

Downscale a 0 - 5volt supply to a millivolt range

I am currently at keen novice stage in my understanding of electronics so i hope my question makes sense! I have a project I am working on that requires the simulation of a sensor. The sensor is ...
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1answer
48 views

I have a micro controller whose specifications state operating voltage from 2.3v to 5.5V [closed]

Does this mean my input has to be in this range or can it be higher?
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3answers
87 views

Insufficient current to drive automotive relay?

I'm adding a leisure battery to my van so I can run some stuff with out fear of draining the starter battery. My leisure battery is wired to my starter battery so it can charge from the alternator ...
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2answers
112 views

LED lighting project wiring Questions

let me begin by thanking anyone and everyone for any help. I have a serious lighting project and am likely getting very ambitious. I am trying to wire up a series of WS2812 LED strips. Each 2 ...