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Questions tagged [capacitor]

A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.

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Aluminum Electrolytic Capacitor Venting Creating Condensation in Enclosure

Has anyone ever come across significant condensation on electrical components inside an enclosure due to venting of aluminum electrolytic capacitors ? My 560uf 400V Chang capacitors (believed to be ...
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86 views

Understanding the trancitor (transfer capacitor)

In one of my lecture class, one of my electronics professor told a little about a new technology called "trancitor" and told it is opposite of transistor. He asks us to learn more about it on our ...
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43 views

Variable LDO implementation - capacitor size

I am designing two linear power supplies that will: Drop 9V DC to 5V DC to power a Raspberry Pi around 2.5A Drop 9V DC to 7.5V DC to power a DAC under 3A I plan to use Texas Instruments LDO UCC283-...
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77 views

How many capacitors are needed for a step down circuit?

I'm tyring to build my first step down component using TPS562219 to get 5V output from a 12V input (instead of 1.05V output shown in the example). But as I'm new to this electronic stuff, I have some ...
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43 views

Transmitting power through Push-Pull converter [on hold]

simulate this circuit – Schematic created using CircuitLab I have a circuit in Simulink that consist PV array and push-pull converter. The load is a simple resistor and with MPPT I extract the ...
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83 views

Capacitance decay of SMD ceramic capacitors

I want to use a 330nF X7R ceramic capacitor for an analog circuit. Obviously the capacitance value is very important for the correct working of the circuit. I haven't found on the datasheet if these ...
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23 views

LTC4366-2 cold crank condition

I would like to use the above design recommended in the LTC4366-2 datasheet. The is a problem on cold crank 12V systems, that can drop to 4-6V during staring of the engine. Can I use a capacitor like ...
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43 views

Voltage across the capacitors

This is a solved example from the book "Practical Electronics for Inventors" I did not understand how the voltages across the two capacitors come to 9V when circuit is switched to A and then ...
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50 views

How long would the capacitors in an iPhone power adaptor hold potential energy?

I was curious as to whether one could potentially get a shock after touching, with sweaty hands, the prongs of an IPhone power adapter upon unplugging it. If possible, how long would this charge take ...
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56 views

X2 capacitor. Test if failed open

I am looking at a small board in a paper shredder (it does not work). If I apply AC power and measure AC voltage across the X2 capacitor (I think it acts as a voltage dropper for the low voltage ...
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1answer
62 views

Determine the voltage drops across the capacitor

I am having troubles with one type of tasks when preparing for an exam. I think I get the way to solve it when t = 0, but I don't really know what my approach should be when t>0. Task: That is how ...
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1answer
40 views

RC-circuit with one input terminal and many outputs with different integration time

What is the simplest way to create an RC-integrator with one input terminal and several output terminals which differ their times of integration (see schematics below). simulate this circuit –...
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Problem with setting initial voltages in LT Spice

I was trying to set an initial voltage for a capacitor I was modeling in LT Spice, and I tried using the command .ic V(Vc)=20000 (Vc is the node directly after the capacitor, with ground on the other ...
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2answers
79 views

How do coupling capacitors in transistor not affect biasing?

I understand the usefulness of the capacitors in an amplifier circuit but i dont understand why we use one at the input? and how does this not affect the biasing if it removes the dc voltage? Thanks.
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how to choose the values of inductor and capacitor that is available in the market for a dc dc converter? [closed]

How can I choose inductor and capacitor values available in the market? My input voltage varies from 2.7 to 4.2 volts. I got the inductor value of 130.9 micro henry and capacitor value of 207 micro ...
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1answer
43 views

Can I sum up multiple, alternating series capacitors and resistors like this?

When the components are between each other, can I sum up multiple, alternating series capacitors and resistors like this? Thanks.
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51 views

By replacing capacitor values with different ones in a circuit, will the circuit still work?

I'm fairly new to electronics and following this schematic for a "Truth Meter", which detects sweat from your fingertips and a lights up an LED depending on the resistance of the skin, as one of my ...
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77 views

Does a capacitor discharge and recharge in a loop while power is going through it? or only when power is cut off?

Beginner Question. I'm trying to understand how a simple LED flashing circuit works, here is a picture of the circuit: I know that much like a Relay, a Transistor could be used as a switch by using ...
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62 views

How analyze this circuit?

I'm working with this circuit. I don't know how I should analyse in a mathematical way. I don't know how I should take the analysis of the capacitor in this kind of circuits. I have to find the ...
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51 views

391 ceramic capacitor is not turning on my LED using 3.5 V power

A very beginner Question. I have attached a 5mm LED to 3.5 V power coming out if my aurduino port. Light turns on its own however, when I put a ...
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1answer
49 views

Confusing phasor representation

Why capacitive impedance has the magnitude \$Z_{c} = \frac{-j}{\omega C}\$ but in the phasor diagram, we represent it as a vector pointing in the upward direction?. Same is with the case of an ...
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57 views

Boosting speed of data on GPIO line between microcontrollers

I made a circuit in which the data bus P0 of an AT89S52 is connected to the P1 of an AT89C4051 and both clocks are each driven by their own 22.1184Mhz crystal. I have used a 10K standard pull-up on ...
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Can you change the parameters of all of a certain kind of component in LT Spice?

I was wondering if there was a function in LT Spice that I don't yet know of that would allow you to either select a bunch of components, or all of a certain kind of component (capacitor, resistor, ...
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55 views

SMD capacitor tolerance [closed]

I am studying a project and I have some confusion about the tolerance of the capacitors. In the project, SMD capacitors are used with 20% tolerance. As I have seen, most of the SMD capacitors people ...
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1answer
34 views

Problem with load switching at capacitor resonant frequency

I was watching this video (EEVblog #1117 - PCB Power Plane Capacitance) where the author analyses the impedance curve of the capacitance formed between a PCB's power planes. The comparison with a ...
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2answers
45 views

Graphical method for obtaining waveshape of current

I was doing exercises of the book Electrical Engineering Fundamentals by Vincent Del Toro. Then I saw this question. The voltage waveform shown in fig is applied separately to a pure capacitor of 1 F ...
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1answer
63 views

Does voltage rating increase on ceramic capacitors have any effect on the performance of the capacitor? [duplicate]

If I have a circuit that is designed for a ceramic, SMD, 0402, 1uF, 10%, 10V rated capacitor, and I swap in a ceramic, SMD, 0402, 1uF, 10%, 25V capacitor would anything change in the circuit? Would ...
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37 views

Ceramic capacitors in series to increase AC voltage rating

If I put 4 of 1uFx100V cercaps in series I will virtually have one .25uFx400V capacitor. As I know I should use balancing resistors for even distributinon of the voltage across the capacitors. ...
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2answers
45 views

Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit

Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R: How do we modify ...
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1answer
56 views

Charge capacitor with static electricity

Can i charge a capacitor fully with only static electricity? I already took a look at: Electrostatically charging a capacitor and How to charge a capacitor with static electricity? but i'm not sure ...
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53 views

Capacitor actual value with DC bias

I did find this answer which explained why the capacitor is affected by the DC bias, however, my question is more on the application. Let's say I have a capacitor for which I have the DC bias ...
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2answers
57 views

Bridge rectifier filter capacitor remove

My question is very simple. What components should be removed from the following circuit diagram for this circuit to work only on DC voltage? I'm sure that the bridge rectifier should be removed ...
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66 views

Needed capacitance calculation

I have a circuit in which I have a Li-Ion 3.6V battery, then a voltage regulator that outputs 3.3V and then the circuit. Also it contains a couple of tiny 1uF decoupling capacitors in front of and in ...
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53 views

Building a series RLC circuit using a given resonant frequency and bandwidth value

Assuming that we have to build a simple series RLC circuit in such a way that the its resonant frequency must be 200 krad/s and its bandwidth as 20 krad/s, we have these components: Resistor: 1000 ...
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Frequency of an astable with BJTs

I am trying to find out how to calculate the frequency of an astable but I can't understand one thing. If I have the astable from the picture below, why is the frequency growing if I lower the current ...
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69 views

How does the capacitor charge and discharge in this configuration?

I wanted to build a metal detector using 555 timer and I found this circuit online along with a video of the working model. It says that the timer works in astable mode. But since the capacitor is not ...
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1answer
69 views

Supercapacitor electric model

I am doing a dissertation in Electrical and Computer Engineer which involves supercapacitors. I read the norm IEC/EN 62391–1 and the 60384-1 but still I don't have a clear answer for what's the ...
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3answers
139 views

Can I touch voltage?

After watched this man this man, I have some questions. He touched 170 VDC, what is max DC voltage can I touch when I dry? And wet? What is max AC voltage can I touch when I dry? And wet? Is ...
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58 views

Why is resistor in parallel with capacitor needed in capacitor bank?

Capacitor bank in power supply compensates for when input voltage is shortly disconnected (50ms lets say). Do capacitors in this setup (between input and the output of power supply), get initially ...
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58 views

Which one is the positive side?

I'm newbie, thus my simple question. In the schematic below, which side of the capacitors is the positive? Why? Or are they assuming that I have to use ceramic capacitors? Usually my schematics come ...
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49 views

Tolerance on SMD Aluminum Electrolytic Capacitors

I'm searching for some polarized surface mount device capacitors on lcsc.com and notice that they only have tolerances of \$20\%\$ tolerance devices in their catalog for this type of SMD device ...
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2answers
41 views

How to read Capacitance Table?

I bought a 30pF Variable Trimmer Capacitor, but am unsure how to adjust it. The lowest capacitance I am getting by adjusting the screw is 50pf, and it doesn't seem to matter which way I turn it. I ...
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1answer
52 views

How do I connect up a replacement run capacitor

I have bought a replacement Run Capacitor for a forced action mixer (special cement mixer), as the run cap on the mixer blew. The mixer has a single phase motor, and although we are in the UK, it runs ...
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1answer
50 views

extending very short voltage peak with capacitor?

I want to measure the hight of a very short voltage peak using an analog input It does not have to be very exact. the duration of that peak is between 1 and 2 milliseconds, is it possible to extend ...
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1answer
71 views

High voltage variable capacitor design

I’m building a homemade small magnetic transmitting loop antenna that I want to ultimately operate at up to 1500 watts over the HF ham radio bands. One of the challenges with these antennas is the ...
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32 views

battery model output voltage

I'm trying to create a battery model using an equivalent circuit with a voltage source a resistor and 2 RC elements. To make it easier in this question I just used 1RC element. simulate this circuit &...
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4answers
3k views

Can I replace these many capacitors with just one?

I'm designing a schematic for an addressable RGB LEDs array and I've chosen the WS2812B because of how common and cheap they are. Looking at the typical application circuit, I noticed there is a ...
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Undervoltage/capacitor problems with Raspberry Pi

My question is about the correct way to add a capacitor to a circuit with a Raspberry Pi driving a servo. I have seen undervoltage events in the logs of my app when the servo runs so I added a 470uF/...
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2answers
32 views

Axial capacitor terminal leads snapped!

Unfortunately, while in transport, my capacitor's terminal leads have snapped right to the bottom. What can I do? Can I solder something in their place, so it can work? Many thanks.
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Slow build-up and discharge LED effect

I was trying to build a circuit that if switched on would slowly (in span of of 1~5s) light up around 20 LEDs - progressively, not all at once. To achieve that i used one capacitor to initiate the "...