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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257 views

What do you call a 1:3 turn ratio transformer?

I need a small surface mount or slightly larger transformer with a 1:3 turn ratio that will triple my voltage from 3.3 to 9.9 volts. I have been literally searching the internet for such a thing and ...
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1answer
44 views

How to maximize the voltage range using an operational amplifier (differential amplifier)?

I'm trying to maximize the voltage range using voltage dividers and operational (differential) amplifiers, but am not able to do it. I do not have an electrical engineering background, but my project ...
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1answer
61 views

Is a neutral wire necessary between 2 circuits

Suppose I have 2 circuits with their own individual power supply. Circuit 1 needs to send some sort of signal to circuit 2. Would I need to carry the current back to circuit 1 after the signal has ...
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0answers
31 views

Split voltage in 2 to distribute to 2 separate circuits

I have 2 motors that takes about 6Volts and I have a battery that gives 12+V. I need a way to ensure that both motors get 6V rather than one getting more. Is there a way to split the voltage into ...
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0answers
34 views

UART communication with ADUCRF101 [on hold]

I am trying to establish a UART communication between BF609 board and ADUCRF101 i wired : The Tx pin of my board to the Rx pin of the ADUCRF101 The Rx pin of my board to the Tx pin of the ADUCRF101 ...
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0answers
46 views

Circuit Partial Failure

We are working on a circuit which appears to be failing during operation due to heat (putting a fan over it keeps it running). We have narrowed the possible parts down to a power resistor and a zener ...
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1answer
43 views

Step voltage down via voltage divider, then grab original voltage output

I have a pressure sensor that takes 5v and outputs a voltage based on pressure, however the input that I read cannot exceed 1.8V due to limitations of the board that I am using. Thus I was wondering ...
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2answers
77 views

Are there any dedicated chips for measuring logic supply voltages?

If I reboot into my PC's BIOS/UEFI I can get "instantaneous" readouts of its 12/5/3V3 voltages to 3 decimal places. How is this classically done? Is this just a classic resistor divider into an ADC ...
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2answers
39 views

Voltage Rating of a device

When a buzzer 'rating' is 3v, What does that exactly mean? When my buzzer 'input range' is from 3-10v?What does 'rating of a device tell us? Can someone differentiate between the two parameters above?
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2answers
62 views

Voltage reference sampled by ADC (12 bit) gives value that is off by more points than other measurements

I am using the TI REF3020 voltage reference (2048mV) in combination with a microcontroller in order to have a reference for voltage measurements. The microcontroller is powered by 5V (5.00V), the ...
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1answer
74 views

Can a small voltage represent a closed circuit? [on hold]

I know this is somewhat of an odd question, but I'm curious about whether or not a small (or maybe matching*) voltage on a wire can represent a closed switch. ** more about this in a moment*. ...
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1answer
58 views

Can a 74LVC1G07 handle 12V?

The 74LVC1G07 is open-drain, but I don't find anything in the datasheet that tells whether or not it can handle 12v on the output ("Y") pin.
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1answer
67 views

Circuit for Current Injection and Voltage Reading

I am developing a sensor based on the principle of EIT (Electrical Impedance Tomography). For the project, I need to inject into the material I am using, a constant current between two electrodes ...
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1answer
28 views

Generate +2V Offset on a +12VCD Supply line

I have a 12VDC @50mA_Max supply line. I need to inject a +2V 50us offset pulse to the +12VDC line, having an effective +14V for 50us. I have access to an external power supply, where I can have ...
4
votes
3answers
105 views

With limited components, how do I emulate a reverse-biased zener diode?

I understand that reverse-biased zener diodes don't conduct at all until they've reached a certain breakdown voltage, after which their voltage drop remains constant. I want to use this property in a ...
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0answers
7 views

Can I use a Revolectrix Power Lab Cell Pro 6 to power XB1?

I had a quick question, wondering if it would be possible to use my Power Lab Cell Pro 6 battery workstation to rig up a power source for a MS Xbox 1? Similar to this question, but different power ...
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1answer
91 views

Is there a circuit that can multiply the voltage of wire A by the voltage of wire B?

Is there a general 2-input/1-output circuit that multiplies the voltage of one wire by the voltage of the other wire? For example, Voltage of A = 3, Voltage of B = 5, output voltage is 15.
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2answers
44 views

If i lower voltage drawn from a battery will it last longer?

I have a water pump that operates between 5-12v at 3amps. At 5v the water flows slower and at 12v it flows fast. If I have it connected to a 12v battery and use a step down converter to convert the ...
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1answer
48 views

How does voltage splits when 2 devices was attached together [on hold]

I'm new here and im not an electrical guy. Just trying to create some DIY stuff. I want to know how to properly buy power adaptor for my newly purchased led light. I have led light which is 12v and ...
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0answers
66 views

Can you only lower the breakdown threshold voltage of solid insulators once with high-voltage?

For example, insulator Z has a threshold voltage of 1000V. After exposing insulator Z to more than 1000V, its breakdown threshold voltage is now 800V. Can I lower the threshold voltage further with ...
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1answer
35 views

Voltage reduction issues in an existing circuit [closed]

In the above diagram, I am trying to reduce the input voltage of 7.4v to no more than 3v, which is the maximum rating for the M2 motor. This is for a boxmag used with an Airsoft gun, specifically an ...
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1answer
70 views

Voltage difference between two individual voltage sources

I have two voltage sources. The first one is 230VAC to 5VDC cell phone battery charger while the another is output from Raspberry Pi's Ground and 3V3 pins. I feed the 5VDC output for an Arduino. What ...
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0answers
23 views

Please help me to solve this problem op amplifier is ideal bode plot [closed]

[![enter image description here][1]][1] [1]: http://i.stack.imgur.com/ms14B.jpg solve this problem op amp
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1answer
47 views

Creating a simple voltage regulator for medium currents

Question, as fast as possible: Would this circuit regulate poorly-regulated +12VDC effectively? I am an electronics level zero, so please bear with me. Please let me know if you would me to clarify ...
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2answers
70 views

Overvolting a dc motor while keeping power constant

So i have 36v dc motor rated 70A at 2000w (mechanical output power) . I would like to run the system at 48v (same power) because i have a lot of accessories for 48v system ( battery chargers , dc/dc ...
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0answers
65 views

Can anyone tell me how much will it cost? [closed]

An appliance uses 14 * 10^6J of energy for one day. How much will this cost the user if the cost of electricity is 6. 5 cent/kWh?
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5answers
89 views

Plugging the same device on a jack of smaller tension will draw more or less current? [closed]

I'll put a set of ''right's''numbered based on my current assumptions, so if one of them is wrong, you can just point a couple out. Let's say I have a device that is labeled ''660W/220V'', so It ...
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2answers
98 views

Electricity transfer basics [closed]

First off, I'm sorry if this is something that's been covered before. I tried scrubbing the internet but can't quite find an answer to my questions. I have o my a very remedial amount of electric ...
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2answers
89 views

Can you really overcharge a battery at its rated voltages?

Say i have a 12v battery dischared to 11v and i connect it in parallel with an AC Adapter whose final output is 12v dc In ideal case any current flow towards battery should stop as soon as battery ...
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1answer
44 views

What is the total current of a circuit if the voltage drop across R1 = 6 volts. R1 is 300 ohms and R2 is 100 ohms. V R1 = 6V [closed]

What is the total current of a circuit if the voltage drop across R1 = 6 volts. R1 is 300 ohms and R2 is 100 ohms. V R1 = 6V Picture uploaded.
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5answers
1k views

Equal voltage, but not shorted?

This is a fundamental circuit question. Suppose two nodes of a circuit are always kept at the same voltage by some unknown mechanism. If I now connect these two nodes with a wire, would it introduce ...
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2answers
423 views

Electronic components without rust or corrosion

Is there any sort of special conductive material that doesn't rust or cause corrosion?
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1answer
67 views

What is the correct way to hook up a second battery and solar panel to a vehicle? [closed]

I'm looking to install an aux battery in my van and hook it up to a small solar array ( 200w ). I would also like to be able to charge the second battery from the alternator when the van is running. I'...
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1answer
90 views

Bench Power Supply Project

I got a 750W (12VDC, 62.5A) power supply (I don't have it with me right now so I can't remember the model) from a old server and I was thinking on using it to create a lab bench power supply. My ...
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0answers
58 views

RS 422 signal voltage booster

I have RS422 output signal with 2.6V peak to peak, However after distance 25 meter this signal voltage is attenuated upto 0.8V and receiver is not able to detect signal. Is there any IC for boost this ...
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2answers
107 views

Simplest “battery low” indicator for a 3.7 volt lithium ion battery

I just need a single LED to light up when the voltage drops below a threshold like say 3.3 volt ( sharpness is not that important ). I know basic electronics like transistors,logic gates etc. On ...
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2answers
54 views

lm358 arranged as a 5 volt Buffer

simulate this circuit – Schematic created using CircuitLab I am trying to connect my lm358 so that it acts like a buffer. I am connecting: VCC to + 5 volts Ground to Ground Non-inverting ...
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1answer
44 views

Why can I power a 9 volt application on the Collector side of a transistor, and not the Emitter if Base gets 5 volts.

I have a 9 volt application that I want to trigger using an Arduino and an NPN transistor. The Arduino can supply 5 volts to the base. I tried to place the application on the Emitter side of the ...
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1answer
45 views

Different voltage between the solar charge controller and the battery

I have a solar "box" project with a 10 W, 12 V panel and I noticed something when I was testing the battery voltage (two 12 V battery in parallel). When I measure the battery voltage directly from ...
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1answer
50 views

voltage in an electrical circuit consisting of a current source

In the following circuit is it correct to ignore the current and simply add all the voltages to measure voltage at open end? simulate this circuit – Schematic created using CircuitLab If ...
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1answer
65 views

120v power supply section 220v adaptation

I'm building a very simple tube overdrive, power supply section of the schematic can be seen above. as you can see the circuit has been designed for 120v. I will be dealing with 220v instead of 120v, ...
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6answers
2k views

Building an appliance with two plugs to get double the voltage?

I just had a silly discussion with someone about voltages. In Europe the usual voltage is 220 V while in some other places it's 110 V. So we were discussing how to use European devices abroad and my ...
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0answers
19 views

What is the difference between iPad and iPhone charger? [migrated]

Both of them output similar voltages. iPhone 6 charger outputs 5v and iPad Air outputs 5.2v. The current on each charger is different - 2.1A for iPad and 1A for iPhone. What do those mean if the ...
2
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1answer
158 views

What is the difference in the terms “signal return”, “signal reference”, and “signal ground”?

Are there common interpretations for each of these or are they all used interchangeably? For example, node names in a circuit schematic with a earth ground, power lines, and signals lines should use ...
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1answer
107 views

Make +6 and -6 and +3.6 and -3.6 volts from a 12 volt battery

We're working on a project that requires a stable +6 and -6 and +3.6 and -3.6 volts from a 12 volt battery. It has to be stable, even when the voltage of the source goes down. We came up with this: ...
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votes
1answer
311 views

Power supply specifies range of voltage output: how is this possible [closed]

The power supply I bought has an output voltage of "15-24V". I need 19V for my laptop and I couldn't find anything where I could adjust the output voltage to a desired value (like a little screw or ...
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votes
4answers
544 views

How I can test the power supply across the load?

I want to test my power supply at the 12 V 10 A specification. I had tried with connect a 100-watt 0.7-ohm load resistor across it, but by that time the voltage went down to 3 to 4 volt. How ...
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2answers
89 views

A basic question on Current Flow, Voltage, and Power consumption

Background: Assume that I have Bulb that consumes 10 watts of electrical energy (power). The operating values for full brightness are: 5 volts, and 2 amps. Since Power(p) = Voltage(V) x Current(I) = ...
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0answers
27 views

Controlling motor speed with transistors

I am new to this kind of projects. Want I want to do is to control the speed of a dc motor with an arduino. I saw that you can do this using a transistor, Connecting the transistor to the power source ...
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1answer
105 views

Calculating the power supplied by the current and voltage sources

simulate this circuit – Schematic created using CircuitLab I have attended one exam where I was asked to solve this Question. Generally the Power is nothing but the product of current and ...