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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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57 views

Single transistor IR repeater

I need the IR repeater to pass IR (TV and so on) remote signal to remote devices in some box (pass the IR signal from outside the box). So, I bought a cheap IR repeater on single 2TY transistor, 4838 ...
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59 views

Using a capacitor instead of inductor in a switching regulator, and viceversa

Contextualizing more: In a switching topology, and I am butchering it now, the inductor gets "charged", and eventually will keep an amount of energy "just enough" required for the load. This is ...
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2k views

Bjt astable multivibrator questions

I'm working on a little project(an infrared jammer) and I'm having a few issues. Why (and how) exactly do circuits like the one below use electrolytic capacitors? Wouldn't ceramic capacitors be ...
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43 views

Voltage spike at the coil when opening the switch

I've the following circuit: simulate this circuit – Schematic created using CircuitLab In my book they stated the following sentence: After that the switch is closed for a long time, I let ...
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42 views

The pros and cons of tantalum and ceramics in AMS1117

Task: Make a reliable power supply for sensors and an RFID card reader. Specifications: Total current consumption: up to 0.7A (700 mA.) Elements supply voltage: 3.3V Input voltage: 5V Working ...
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3k views

How to choose capacitor for an IC

I'm a beginner in electronics from the software industry. With some self-taught things, I'm trying to implement some basic Arduino circuits. My confusion is about capacitors mainly. My understanding ...
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16 views

How to use a singe transformer with the same effect as 2 in series

For a small project, I would like to know if it is possible to use a singe transformer, and a capacitor to effectively step up the voltage twice, E.g. Two of the same in series. If so, please explain ...
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46 views

Finding time constant in terms of R and C

I got a different expression for the time constant than the actual solution. Can anybody tell me where I went wrong? Why is it that in the solution all three resistors were put in parallel? What do ...
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60 views

Current in charged RC circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab The capacitor is charged up to 10 V according to the following formula (when the switch is closed): $$\...
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222 views

capacitive filter design

I have a question about output capacitor filters. So I know that a simple capacitor filter would have a single pole response, and this is just a first order filter. Let's say that the value of the ...
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2answers
2k views

Charging capacitor in parallel and discharging in series

I wanted to use multiple capacitors to step up the voltage in a circuit. A little bit of google searching told me that it is called a Charge Pump. I figured out the charging each capacitor ...
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38 views

Maximum safe working voltage of capacitors

The answer is 30kV. My method led to an answer of 41KV, where did I go wrong? I believe I cant just add the Vmax(s) at the end, but what would I do instead and why?
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Capacitor voltage rating for dual power supply

I'm currently building a LPF using a differential op-amp configuration and a multiple feedback topology. The opamp I'm using is the THS4131. I supply the opamp with a +/-12V power supply. My question ...
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251 views

capacitor or 2nd battery for invertor situation (automotive)

Background I have a power inverter in my car that I installed about 4 months ago. I bolted the ground on it to the ground terminal connector of my car battery and the + to the positive side of it. ...
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1answer
46 views

Headphone Noise from Laptop SMPS

I have been facing an issue that has been a mystery to me for quite some time, and I wanted to see if someone here can potentially give me more insights on this so I can understand why it is happening....
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1answer
36 views

Is a higher capacitance rating ok for filtering?

I am newer to electronic design and bought the mpu6050 sensor chip, which the documentation can be found here: https://datasheet.lcsc.com/szlcsc/TDK-InvenSense-MPU-6050_C24112.pdf It says that pin 20 ...
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94 views

Capacitor circuit simplification

I am unsure if I have simplified this circuit correctly, therefore I am unsure how to write Vo in terms of V1. Please let me know if I have simplified this correctly.
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186 views

Raspberry Pi hat design

I am designing a Raspberry Pi hat that needs to be able to accept inputs from 3 different water meters. Two of the inputs are 4-20mA signals, the third input being a pulse signal. At the top I have ...
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64 views

Aluminum Electrolytic Capacitor - current, power, efficiency

How to find out the efficiency of an aluminum electrolytic capacitor like this one. How to find out resistance of such a cap in order to calculate the time it takes for it to charge up or discharge? ...
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49 views

Unknown PSU blown capacitor [on hold]

Hi, I have a 1988 laptop with a blown PSU capacitor (was located in c10). The capacitor still barely reads 395 (which an online calculator says means 3.9uf) and +35k which means 35v(?). 1) How ...
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37 views

Removing a charged coil from circuit

I have a question: If I charge a capacitor through a resistor and remove it from the circuit, the capacitor will be charged for a certain amount of time (eventually the voltage across the capacitor ...
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3answers
84 views

Low capacitance value capacitors in LC bandpass filter

I am going to try to build a Butterworth LC bandpass filter. However, using some online calculators result in some very low value capacitors (sub-1pF). I am thinking that the performance will not be ...
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3answers
270 views

Using capacitors for radio communication

I am using a NRF24L01+ 2.4Ghz radio transmitter to talk between Arduinos. I was having issues with them frequently cutting out for short periods of times. I noticed that when I added 100uF ...
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1answer
36 views

What are the specifications of this capacitor marked '3R910, R L'?

I have a battery charger circuit, this capacitor sits between the rectifier diodes and chunky set of inductors and diodes on the AC input side. The battery charger is 30A 12V car battery so pretty ...
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2answers
126 views

Non polarized capacitor in schematics

enter image description hereI am restoring my Sansui AU 6600 Amplifier. I have taken out all old electrolytic capacitors, and my question is. From the part list for F 2092 capacitors C05 and C06 (10&...
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224 views

Full bridge driver capacitor ringing problem

This is my first time designing a full bridge driver. I am experiencing problems with ringing on the output. I have made a pcb for it. This is a picture of the top side of the board. Backside Input ...
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4answers
3k views

Identifying an unmarked SMD capacitor and chip

So I'm setting myself into SMD components, as I want to create my own compact 5v step down converter, based on this component. I've read that these small brown ceramic capacitors are most likely ...
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191 views

RC-Circuit With Two Capacitors that are neither in parallel nor in series

Background In our course, we have covered everything related to RC-RL-RLC circuit, however, all questions were based on the fact that you either have parallel or series connection. I've not taken ...
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38 views

Two modes of electrostatic force with charged capacitors?

During a charged state of a capacitor (Regardless of the type of capacitor), Simple parallel plate: .png Parallel plate with dielectric material in the gap: ]3 Supercapacitor: How is the ...
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38 views

Accumulation of batteries' energy to rise electrical power capability

I am looking for a method to drive/pulse (ocasionally) an inductive load from a battery. The problem is, that the battery does not deliver enough power the load needs. But, energy is not a problem. I ...
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49 views

Finding the voltage across an inductor in a RLC circuit

Well, we have the following circuit: And I need to find the voltage at the node \$\text{Y}_1\$. My Work: The input voltage and current relation is given by: $$\frac{10}{s}=i_{in}(s)\cdot\frac{1}{\...
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1answer
215 views

Tips for designing 4 pad feedthrough capacitor in Altium Designer

I'm doing a PCB design in Altium Designer where I would like to include a feedthrough capacitor from Murata (MPN: NFM18CC101R1C3D). This is a special type of capacitor with 4 physical terminals where ...
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1answer
39 views

RIFA PME271M547 replacement

I just broke my sewing machine (it's an old Viktoria machine about 30-40 years old) and now I am looking for a replacement safety capacitor. The one installed is a RIFA PME 271 M 547 paper capacitor. ...
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40 views

C=Q/U equivalence for inductor

In order to calculate the time it takes to charge a certain capacitor with value C at a given constant current of a value I to a voltage of value U, I can use: $$ C = \frac{Q}{U} = \frac{I\Delta t}{U}...
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What is the change in voltage across an inductor, or change in current through a capacitor?

The formula for voltage on an inductor is stated as v = L (inductance) x (di / dt) and current for a capacitor is i = C (capacitance) x (dv / dt) But I don't understand what the (dv/dt) part of ...
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53 views

what does Loss Tangent means in capacitor?

As we know the definition of Loss Tangent in capacitor which it is: When a sinusoidal alternating voltage is applied to an ideal capacitor, the current advances by pi/2 in phase. In the case of a ...
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41 views

Finding the equivalent capacitor

Given the following circuit: simulate this circuit – Schematic created using CircuitLab I'm trying to find the equivalent capacitor assuming that the capacitors are already charged. I'm aware ...
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77 views

What are the main characteristics of high reactive power RF capacitors?

This question is related to this one. I have to design a high quality factor RF parallel resonant circuit, to be placed in parallel to the output of a medium to high power RF generator. Precisely, ...
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69 views

In Circuit Tester design

I wanted to create an ICT to check for shorts and validate some of the voltage levels on a PCB that I created, using a jig. I have placed probe points on the desired nets and will be using pogo pins ...
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21 views

Moving a capacitor in a time varying or non-time varying magnetic field?

1) If a simple parallel plate capacitor connected to a circuit, and discharging, were to move in an exterior magnetic field, what would happen to the interior region? Interior region components: ...
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280 views

How to determine the capacitance from the capacitor charging current

Consider the following circuit, and the recorded current curve (amp-meter current_in). How do I correctly determine the capacitor's (C_1) capacity, without looking at the time constant? My idea was ...
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24 views

(Very Basic) Confused on Reading a Datasheet and Calculating Inductor Ripple Current for a switching Regulator

I am using this component for a project, however, when reading the datasheet I have just become confused about a couple of things. Datasheet : http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf I am ...
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1answer
480 views

Why are the capacitors necessary for a quartz crystal?

I read that it is recommended to connect 2 grounded capacitors to both ends of the quartz crystal. But that doesn't make any sense to me. Since capacitors have no resistance, wouldn't that make it so ...
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4answers
481 views

Is the capacitor placed correctly in the schematic?

I am new to electronics so any form of advise will be helpful. While trying to build a line-following robot by studying the circuit schematic(as attached), I wanted to find out what the capacitor C1 ...
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3answers
106 views

Understand ground and ceramic non polarized capacitor

simulate this circuit – Schematic created using CircuitLab I'm trying to learn some basics of electronics. I want to build a circuit for my raspberry with main components to use in programming. ...
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1answer
522 views

Voltage drop (stop-start) impacting car DVR/dashcam

My scenario is simple. I have a 12V to 5V inline USB convertor powering a dashcam/dvr. However, the circuit of the car I'm using to power it isn't clean enough, especially with the car's stop-start ...
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1answer
72 views

Supercapacitor and an applied exterior magnetic field?

I'm curious of the effects of an exterior magnetic field to a Supercapacitor, in both states of charging & discharging. If the Supercap. is placed inside an area where an exterior magnetic field \...
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1answer
50 views

Ceramic Capacitors vs DC Bias - Derating rule of thumb misleading?

Premise Ceramic capacitors with Class 2 dielectrics (such as X5R and X7R) usually show a reduction of its capacitance value as the applied bias voltage increases. This behavior is more prominent in ...
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202 views

If I supply 24v to a 50v rated 22000uf electrolytic capacitor, does that mean it will store 44000uf at 24v?

Is the higher voltage just a safety thing, or can the capacitor actually store more charge? Also, if I supply it with 24v, will it output 24v or 50v? I read the wikipedia on capacitors, watched a few ...
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1answer
70 views

Powering phone using LDO regulator on battery terminals - what reservoir cap to use?

I have rigged up an old phone that does not run without a battery by attaching an AMS1117 regulator to the battery terminals. The regular is fed from +5V USB, and outputs 3.3V. The regulator comes on ...