Questions tagged [capacitor]

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

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What would the output waveform be in each of these cases?

In the second picture, the source is a step function from 0 to 1V. I feel like I solved them, but I am not convinced that my understanding is air-tight. Any help is appreciated. Edit: Adding my ...
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Ramping up Regulator Voltage on Switch On

I'm currently trying to design a supply using a low dropout regulator capable of 1.5 A that has a high capacitance of up to 1 mF at its output. To limit inrush current I would like to ramp up the ...
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Why is a 4th order circuit referred to as 2nd order?

An \$n^{th}\$ order circuit has \$n\$ reactive components. So a circuit with 2 capacitors and 2 inductors (total of 4 reactive components) should be considered a 4th order circuit. However, I have ...
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75 views

Are my capacitors working properly or not?

I've bought some capacitors because I needed to generate a current pulse into a coil. The idea was to charge a capacitor separately and then connect it to the coil to have a strong and brief magnetic ...
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35 views

Theory vs practice in amplifier circuits with capacitors

Electrical Engineering student here! (AKA beginner) Suppose we have a general circuit (ie bjt cascode amplifier, differential amplifier etc) To perform theoretical DC analysis we treat capacitors as ...
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34 views

Calculate the integral of a saw tooth wave

My question is with reference to this question over here Suppose, I have a saw tooth current source with peak value from 0A to 1A with a frequency of 1kHz and I need to calculate the charge of the ...
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Which slogan is the best for a company? [closed]

(product is capacitors) option 1: Capacitor charges creativity option 2: Capacitors charge Competitiveness option 3: Create Core Competitiveness option 4: Charging core competitiveness Which one do ...
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Engineering specs for converting AC to DC

I’m experimenting with electricity generation. I am generating 110V AC, wattage and amperage unknown (after a step down transformer from 400V), and I want to rectify the AC into around 130V DC to run ...
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Not understanding how the output is forming because of the diode

I'm rather new to electronics and I don't understand how the output is formed in this question: I'm providing an input (Vin) of 5V peak-to-peak sine wave with a 1kHz frequency. I simulated this in ...
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Design with half wave rectifier with filter capacitor

I would like to have your opinion on some calculations I am doing on the unregulated output of a half-wave rectifier with filter capacitor. The diagram is as follows: With Vsect = sinus wave with 311 ...
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2nd Order Circuit

just want to check whether am i doing correctly? How do I know when should I find Voltage ODE and when should I find current ODE? Thank You Update: Vc(0) shld be zero.
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LM53603 capacitors package size

in my project Im using the LM53603 voltage regulator. In the datasheet's typical application I see 3 capacitors on both the VIN and ...
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68 views

Capacitor based pulse generator

I want to make a simple circuit where LEDs are alternatively turned on. I have, say, 20 green LEDs and 20 red LEDs. The first half second, the red LEDs should be turned on, the next half second the ...
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51 views

Basic Peltier driver causing horrible voltage noise

This is a very trivial question but I am lost. What I am doing: Just for fun, I did a Peltier water heater (the idea was to cool the driving MOSFET with the Peltier cold side, which pumps said heat to ...
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53 views

Thin leads on a 100nF capacitor [closed]

For a board modification to 50 PCBs, I want to use a couple of nominal 0.5mm drill diameter vias to attach a thru hole 100nF capacitor. I can find lots of ceramic capacitors with 0.51mm lead diameters,...
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What is the formula or any method to calculate the value of the output capacitor and inductor in a buck converter

I have using a buck converter whose output is 5V and 1A. Can someone tell me whether these is any formula to calculate the value of the output capacitor? Like, without involving the switching ...
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202 views

Which components cause low humm and medium to high pitched buzz in this computer monitor? [closed]

I recently bought a ten year old 10-bit color fidelity computer monitor (NEC PA301W) that has brilliant display quality but to my sensitive ears has an audible/annoying low pitched humm noise along ...
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E Series: is there any place that explains it?

So I am doing a work on optimizing circuits, and I came to study the E series of components. I'm a bit confused and I cannot understand soem things: How do the tables of values (E3: 1.0, 2.2, 4.7) ...
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78 views

Parallel RC circuit differential equation for a mechanical engineer

For a mechanical engineering course in controls, I was asked to Write the differential equation, state equation, and transfer function for this circuit That's the full text of the problem, and the ...
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3answers
485 views

Is it a good design practice/necessary to put some capacitors next to the power connector on a PCB?

I've seen some schematics that do this, and some that don't. Is it best practice to put some caps on the input power rail next to the power connector to smooth out any transients, or for some other ...
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57 views

LTspice simulation: unexpected behaviour of circuit

I am trying to build a JFET driven current source in a more complex circuit topology than shown here. Unfortunately, the simulation is not giving me the results I would expect. I could trace the "...
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1answer
60 views

Need help identifying power potential of a circuit [closed]

This unit is an ESC for a brushless motor. I need to know the maximum voltage it can handle; I keep blowing 25V, 2200μF capacitors while trying to run 48V on it. Secondly, what capacitors should I ...
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82 views

Voltage across capacitor measured in parallel, why not showing Vc?

I am trying to understand something and missing something. In a low pass RC filter, the output is connected in parallel with the capacitor, right, and is phase shifted, because the current in a RC ...
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139 views

Voltage vs frequency in RLC circuit

https://www.eeeguide.com/voltage-and-current-in-series-resonant-circuit/ Here is the graph b/w V vs f. Why at some particular frequency (fc), the capacitor voltage goes beyond supply voltage (Vs) ...
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161 views

The use of capacitors in voltage regulator schematic using 7805 and 7812?

I'm a newbie in electronics so I lack a lot of basic electronic knowledge. I found this schematic about making regulated power supply 5 V and 12 V DC from AC. The diagram is below: This is what I ...
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Which (if any) capacitors should I choose for these DC/DC converters?

I’m trying to choose/work out if I need capacitors for the input and output of two DC/DC converters. The first converter is a Murata PAE-29/3-D48, powering this along a ~30cm cable, and a bike ...
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163 views

Negative phase shift in low pass RC filter but positive in high pass? In the context of pure capacitance circuit

That there is a 90° phase shift where "current leads the voltage" in a "pure capacitance" circuit such as in schematic below, is easy to understand. It also fits 100% with the ...
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154 views

No inherent amplitude loss for AC across a capacitor, right? [closed]

This is a bad question unless "misconceptions in learning" is a topic that people here would like. The topic of common misconceptions is pretty common here, and often appears in questions or ...
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114 views

Decoupling Capacitor on GPIO instead of connected directly to battery

I am building a device that is for most of the time in sleep mode. When woken up, I am sending some BLE signals and use a LED. To support the battery I have a 2u2F capacitor. But because my battery is ...
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55 views

Capacitor phase delay caused by releasing stored charge slower than the voltage source?

Capacitors cause phase delay on circuit downstreams of them. Is this because the capacitor is releasing its stored energy more slowly than the voltage source? As seen in square wave example. If yes, ...
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77 views

Help understanding Bosch MP capacitors' several voltage ratings

I've stumbled across a hoard of Bosch "MP" capacitors. I've not encountered these before and I'm having trouble finding any useful information on them. I gather they are Metallised Paper ...
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62 views

Motor run capacitor tolerance

From wikipedia: If a wrong capacitance value is installed, it will cause an uneven magnetic field around the rotor. This causes the rotor to hesitate at the uneven spots, resulting in irregular ...
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58 views

How to find the value of capacitor in a compensated attenuator?

I am learning about compensated attenuators and I do not understand the way that the book suggests to create CF. Is there a link or an image about the way that the book recommends to find the value ...
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Can a circuit with a load reduce the effective distance ina capacitor

Consider a simple circuit featuring a generator and a load. Now consider a separate circuit I using a generator and a capacitor. The capacitor is arranged such that each end is separated from each ...
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118 views

Is it possible to replace a ceramic capacitor with two electrolytic capacitors in this configuration? [closed]

I would like to place a non-polarized capacitor in between V1 and R1. Is it possible to replace the non-polarized capacitor (ceramic capacitor) with two polarized (electrolytic capacitors) C1 and C2 ...
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Battery considerations for a mobile computer station

I'm a pharmacist, not someone in an electronics trade. I'm creating a prototype mobile workstation to be mounted to a medical cart. I have a 12V 2A micro-PC and 12V 4-5A monitor (both have DC inputs ...
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985 views

What are these components used for in the Arduino Nano?

What are the functions of the component(s) in the: red blue green circle? And what is a "+5V auto selector"? https://store.arduino.cc/products/arduino-nano
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Prevent capacitor discharge after it was charged using a microcontroller

I want to use a micro-controller (like an Arduino) to: Charge an external capacitor Measure voltage across the capacitor Capacitor discharge rate as low as possible. Capacitor discharge rate while ...
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2answers
416 views

How can the charge of capacitors in parallel + series exceed the total charge?

I'm solving this question: From this video We can simplify the circuit to be a single capacitor with capacitance of 50 micro farads. Using Q = CV, we can determine ...
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1answer
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Ultra-low power solar cell help

I need your help… Scenario: Use case aside, I have an ultra-low power source (1.5v solar cell) and it is charging a 10uF cap. The solar cell is in a highly controlled low light environment with well-...
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2answers
78 views

Current flowing through a Capacitor

If we connect a pure DC voltage source with only a pure capacitor then what how the graph of current and voltage against time would look like? There would be a transient current and transient voltage ...
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69 views

How to combine elecrolytic capacitors into one big bipolar one

I want to make capacitor with large capacity which can hold both positive and negative charges. Is it possible to combine elecrolytic capacitors somehow to achieve this?
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Calculating capacitor voltage with initial conditions in an RC circuit

If the initial voltage of the capacitor at 0s is 20V, would the equation for the voltage of the capacitor at a specific time be; 60 + (20-60)e^(-t/RC) or would it be 80 - 60e^(-t/RC)
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65 views

How do I find the voltage source? [closed]

I need help with this question. The purpose of this question is to find Vs. The current given is Io which I use as I3. However,the result I get is different from the answer. Can anyone help me check ...
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4answers
77 views

Why is the power dissipated by a PMOS the same as that stored in the capacitor?

When a CMOS inverter switches from low to high, it took half of the energy dissipated to PMOS and half the energy stored in the capacitor. Why is that? I know how to derive the amount stored in the ...
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92 views

Why is my piezo buzzer emitting a clicking sound?

I'm trying to make a voltage controlled oscillator (VCO.) It works just fine, but my piezo buzzer keeps clicking in conjunction with the square wave the NE555P is producing, making a weird effect. Is ...
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1answer
33 views

FET Simulation DC Gate Voltage Different for VDC and VPULSE

While simulating a basic common source JFET amp I found that eliminating the input capacitor improved the gain of the circuit dramatically. This is because without the input capacitor, the gate ...
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Identify This MMK Capacitor on IcePower250W Board

I'm hoping someone can help me confirm the specs of a capacitor that blew out in my subwoofer amp and confirm an equivalent part. I've identified the board it was mounted on as an IcePower250W ...
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716 views

How do RC delay circuits work?

In this figure, the battery charges the capacitor up to 70V. After reaching 70V, the neon lamp turns on and basically becomes short and the capacitor is discharged through the neon lamp. After ...
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183 views

What is the time constant for this circuit?

In this practice problem, the book apparently got the value for the time constant to be 0.1ms. This means that it only considered the 100k resistor to be the Rth. Why is the 10k resistor ignored? ...

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