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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Recommendation for a TVS Diode

I want to add a transient-voltage-suppression (TVS) diode to my design, but am getting confused about the specifics around Maximum Clamping Voltage, Maximum Peak Pulse Current and Minimum Breakdown ...
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1answer
53 views

Measuring Current in 12V DC Fan

I am trying to measure the current of a DC computer cooling fan (Intel E18764-001) at various volts. Its rated specs are: 12V 0.20A. Check it out here. So I am suspecting that this is telling me: ...
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0answers
31 views

Switch capacitor analysis without initial condition

The figure below is described as: C1 and C2 are the pumping capacitors but at given time and conditions of clocks (VCk and VCk'), C1 is being charged while C2 pumps its stored charge to CL (load ...
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3answers
36 views

Subtracting from lipo cell voltage!

I just got a 3s Lipo battery. Lipo battery has a 4 pin connector to plug it into charger or voltage checker. But I don't want to buy a lipo voltage checker, I want to make it. But I have a problem. ...
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2answers
140 views

Voltage not dropping in circuit

This schematic shows the circuit that I'm trying to build. At the moment I'm not using V2, as I'm having a problem with V1. From my understanding the diode should drop the voltage by about 0.7V, and ...
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2answers
42 views

Can I use a 250 VAC socket for 120V power?

I live in canada and I'm trying to build some DIY audio gear. I'm using a toroid http://www.digikey.com/product-detail/en/VPT30-830/237-1326-ND/2090064 (115, 2x15v) And this socket to go with it ...
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2answers
112 views

Is it possible to amplify near zero signals?

Is there an amplifier has an ability to amplify any signal down to -500 dBm? If there is not, can it be possible? If it is not possible, what is the weakest ever signal that can be amplified?
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1answer
62 views

OP amp output not changing ( schematics )

This is a image of most of part of my circuit (555 timer IC is cut from right side)... using the pot (RV1) , I change the non inverting input voltages of the op amps. when non inverting exceeds ...
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2answers
59 views

Capacitance - Voltage characteristic diagram in a Schottky diode

I 've searched the web for that diagram with no satisfactory result. Does a schottky diode has capacitance or not because of very tiny depletion (almost none) zone ?
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0answers
38 views

Max peak to peak swing across ES without any clipping distortion?

This is an exam problem in which my instructor gave the answers but no work. Any one has an idea of how to solve it;FOM(figure of merit)= 25/125, RL=15 ohms, Rx=250 ohms, r1,r2,vee,vcc, are not given. ...
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1answer
66 views

110v 220v do it work? [on hold]

i bought hookah heater from amazon. this product link is ...
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3answers
94 views

Resistors in series or one after?

I want to use a Voltage divider and i need to divide 5v to ~3.3 so I ordered 10K resistors on eBay, but the voltage divider needs a 20K and a 10K, can i use 2 10K's parralel as a 20K
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1answer
64 views

About a solar cell phone charger

I recently made a solar charger. The output energy of solar cell is 2 Watts. The voltage is around 20 volts. I used 7805 IC voltage regulator so i could get around 5V. I used a female USB and ...
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6answers
138 views

How to calculate Vo in this circuit?

In this circuit: The diode is an ideal diode The diode is on since V(anode) > V(cathode) and then we replace it by a short circuit. Now, how to calculate Vo when two sources are existed? I = (10 ...
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1answer
134 views

Breadboard circuit not working as intended

I'm doing a segment of my complete circuit for my school project. But somehow it doesn't seem to work , I've double checked the connections multiple times and I can't seem to find an error. ...
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1answer
45 views

Grid voltage swell and sag, what happens to harmonics?

I know that when a load draws too much power the voltage of the grid at the fundamental frequency begins to sag. Though my understanding is that loads can't use the power generated by harmonics, so ...
-3
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0answers
47 views

Op amp controlled linear voltage regulators [closed]

Please can somebody send me any useful links in order to teach myself about Op amp controlled linear voltage regulators ? I must design and simulate an op amp linear regulator circuit using a 5v zener ...
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1answer
100 views

Jump start car from lithium ion laptop battery

Building the actual circuits is beyond me at this point, but I'm wondering if it's technically possible to jump start a car from the power contained in a large lithium-ion laptop battery. For ...
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2answers
73 views

Output voltage of unity-gain buffer varying with current?

I'm working on a VLC+IR transmitter that runs from batteries. I decided to use an LM317 so that the discharging battery wouldn't really affect the current through the LEDs. (Disclaimer: I've never ...
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0answers
79 views

What exactly is Watts? [closed]

I am just confused as to what it is? I keep reading various explanation on the web and don't understand it. Could someone give me a detailed explanation and definition of Watts? thanks.
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3answers
77 views

Very wide range high voltage measurement with optical isolation

I have a voltage source I'd like to measure, it is from 0V to 1kV, any value in that range. The accuracy isn't that important, but measuring with an accuracy with 1-5% would be perfect. This has to be ...
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4answers
165 views

Why do we need 3 phase power supply?

Why do we need 3 phase? For the reason that voltage will never be zero in 3 phase? OR we need high voltage?
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0answers
31 views

Problem on finding the charge transferred and voltage between capacitors

The goal here is to solve for the voltages between capacitors (i.e. voltage in C1, Cx, C2 and CL). I am aware that during this time the Voltage in C1 is equal to the node voltage at node A because it ...
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3answers
98 views

When is the AA battery voltage drop?

I have a device which is running on two AA Duracell batteries. The batteries (brand new) together is producing 3.2 volts (1.62 volts individually), which is estimated to run for at least 2 years. The ...
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1answer
48 views

NI-MH battery monitor design. Any obvious errors?

Let me preface this by saying I'm not that much of an EE expert, this is a "hobby" project, I consider myself as knowing enough to be dangerous. ;) I'd never apply for a full time career as an EE ...
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1answer
84 views

What happens when the voltage drop does not equal voltage rise in a closed series circuit?

New to electronics. Can't get my head around so many basic things but the application of KVL is bugging me the most. I want to know what happens when Kirchoff's voltage law is broken. If for example, ...
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2answers
51 views

Voltage Dividers in a pull-up resistor circuit (why does the pin go to low)

I understand that when the button is in its open state the voltage on the input pin should be fairly close to \$ V_{cc} \$ provided \$ R_1 << R_2 \$ as \$ V_{in} = V_{cc} \frac{R_2}{R_1 + ...
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1answer
83 views

Solar panel and 120mm Computer fan

Just before I start description my question, I would like to let you know that I am new at this. I am working on a solar air heater for one of my window. I've been researching and reading up on a lot ...
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1answer
75 views

Series and parallel transformers?

I have two different transformers. The output of the first one is 15 volts and 1500 mA. The output of the second one is 5 volts and 500 mA. If I connected them in series (to get 20 volts) what will ...
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3answers
100 views

8V AC signal into 3.3V digital input pin

I'm a noob and I'm doing this to learn, basically. I have a typical old-style door bell with a transformer that outputs 8V AC, the wire the goes through the push button on the door and finally hits a ...
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5answers
112 views

How can a sensor apply a voltage?

(from http://www.adafruit.com/blog/wp-content/uploads/2009/06/tmp36pinout.jpg) Have a look at this picture. It's a simple heat sensor. Though it looks like it's really simple, I don't fully ...
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1answer
81 views

Relay that detects 240VAC and switches 12V DC

I'm wishing to detect the loss of AC power (in this case 240V) and when this event occurs have a 12V DC circuit go to earth. This will trigger an alarm for users to react to situation. Can anyone ...
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1answer
70 views

Graph of Second-Order Circuit

I know that a circuit is second-order circuit if there are two storage elements. I used pspice to simulate and I got this graph I feel like it is not correct. Please tell me my mistake. when there ...
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0answers
79 views

Gadgeteer voltage sensor that can measure up to 8000 volts?

I am a software engineer by day and a pig farmer the rest of the time. I am looking at automating many of the mundane tasks around the farm by deploying IoT all around my farm. One of the first ...
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2answers
70 views

Combining power [closed]

On a computer power supply can I add 12 volts and 5 volts supply to get 17 volt supply? **Edited for clarification
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48 views

Capacitor node voltage problem

What might be the reason why the voltage on the other terminal of the auxiliary capacitor C7 and C8 connected with CKPb and CKP, respectively gets lower than its input? (i.e. input 1.7849V => output ...
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1answer
155 views

Why is it wrong to connect an oscilloscope in parallel with a circuit element?

I was told that it is incorrect to measure the DC voltage across a circuit element using an oscilloscope by putting the probe on one side and the ground clip on the other. I am supposed to connect the ...
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2answers
87 views

Getting 320V DC from 12V DC

I'm a photographer. A friend of mine gave me two big flashes, which I can use without grit. There is a generator, which generates 300-320V DC from 12V DC. This voltage loads the capacitors directory ...
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1answer
59 views

Gate Source Voltage Drop Approximation

When dealing with BJTs in an approximate large signal analysis, Vbe is often chosen to be 0.7 Volts (Given the component is operating in active mode). My question is: Is it possible to do the same for ...
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1answer
46 views

Calculating a voltage and power dissipated in a circuit after creating a supernode

I am looking at this circuit and I am trying to calculate Vx and power supplied by the 1A source. I believe my calculations for node V2 are correct but I am not too sure about my V1 and V3 supernode ...
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2answers
70 views

newbie question: can I plug a 250v power strip into a 120v power outlet (and then connect three 120v power adapters to the power strip)?

I'm sorry if the question is too dumb, but I was wondering if I could connect a power strip rated for 250v into my home's power outlet (120v). I wanted to connect 3 power adapters rated at 120v to it ...
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1answer
48 views

Heat dissipation

I have a computer power supply and I'm wanting to make it a variable voltage power supply but I have to have a load on it which requires some resistance. I have connected a 10 ohm 10 watt at 10% ...
0
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1answer
63 views

Is there a difference between “voltage supply” and “power supply”? [duplicate]

A device, circuit, actuator or chemical structure which outputs a fixed voltage level is usually called with one of the following terms. Voltage Source Voltage Supply Power Supply Is there any ...
2
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2answers
126 views

Does the voltage increase on 10Base2 and 10Base5 ethernet when the signal is reflected? Will this trigger the collision detection?

From what I understand, the collision detection will become true when the voltage on 10base2 or 10base5 coax is abnormal. Quote from Wikipedia: If termination is missing, or if there is a break in ...
-9
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1answer
82 views

TRANSITOR has three pins called ECOLLECTOR AND BASE what material has being used on base and collector? [closed]

Which material used on Base and collector? What is the purpose of Base and collector? You will be highly appriated if you will wait on my foot and hand definately.
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0answers
79 views

Finding the value of capacitance for a given circuit

How would you know how much capacitance you should use in your circuit or is there any formula to compute on the desired capacitance you should use on your circuit? I have this circuit (figure shown ...
1
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1answer
83 views

MOSFET threshold voltage and body effect

I'm trying to simulate a common drain amplifier on LTSpice which can be used to shift the input voltage either up or down by the threshold voltage (\$V_{IN}+V_{TH}\$ or \$V_{IN}-V_{TH}\$, depending on ...
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3answers
172 views

Excessively high temperature reading with LM35

I am really new to electronics and I am just experimenting at the moment with a breadboard. My question here is related to the LM35 temperature sensor and Arduino micro controller. I am getting a ...
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2answers
59 views

Potentials at terminals of battery connected to ground

If we have a battery connected like so: simulate this circuit – Schematic created using CircuitLab Am I correct in thinking voltage on the positive terminal relative to ground is +9V ...
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1answer
48 views

When trying to find the voltage between two points on a schematic I get the opposite answer

I have the following schematic: simulate this circuit – Schematic created using CircuitLab I need to calculate \$V_{AC}\$. I figure \$V_A = 12V\$ relative to ground and \$V_C = 0V\$ ...