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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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43 views

Transformer open secondary

In the circuit provided by the link, would having an open secondary coil (not having it connected to any ground) damage the it? The coil is connected to pulsed 240v ac at 50hz. If it is not arcing, (...
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1answer
40 views

Axial Lead Capacitors - BC 050 - What Are These Markings?

EE, I am trying to fix a circuit and have come across a group of axial capacitors with markings that I have had no luck deciphering. As best as I can tell, they are marked "BC 050" which doesn't ...
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3answers
85 views

Switched Capacitor Theory

https://wiki.analog.com/university/courses/electronics/electronics-lab-19 Hi, I have some confusion about this (It's a stupid question). Initially, the capacitor has no charge stored with S1 and S2 ...
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1answer
19 views

Input and Output Capacitor for PoE + DCDC Controller

I am trying to design a PoE solution using MP8007. It has integrated PD interface and isolated/non-isolated ...
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4answers
83 views

Can’t reproduce oscillations using a simple inductor capacitor circuit?

I’m trying to reproduce a simple oscillator conductor / inductor circuit as shown here. I replicated exactly the same scheme on a breadboard and check all the connections using a led However when ...
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2answers
76 views

Replacing a safety capacitor

one of my electronic appliances has stopped working after several years of use, it is definitely beyond the warranty period however I've been unable to find any more recent appliances that beat it. ...
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106 views
+100

Maximal operational pressure of tantalum and electrolytic capacitors

I need to design a device that have to operate in an high pressure environment (Nitrogen gas). The operational pressure may vary from 1bar (atmospheric) up to 20..30bar gauge pressure. The regular ...
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1answer
93 views

24vac to 24vdc with bridge rectifier BUT

I am needing to power a 24vdc gate motor, it is rated for 24vdc 1A on battery power and 24vdc 4.5A on mains power, i have a laptop charger(AC Adapter) that does 220vac to 24vac and 4.5A but i need the ...
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1answer
27 views

Timing capacitor and resistors -Reg

I have this IC - Advance regulating PWM I would like to understand how does the timing resistor and capacitor section works. Sorry for the beginner question but I am unable to understand this section....
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62 views

Ignition coil transformer [duplicate]

Urgent! Need answers ASAP! I recently built a HV power supply, as per the link (using a pencil ignition coil). However, I used a capacitor of around 5nf, which meant the supply did not work. The ...
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2answers
518 views

Please identify these capacitors and values

I'm tracing a circuit. What kind of capacitors are these yellow things? The upper one has markings of "105V 212K1", what does 212K1 stand for? The lower one has markings of "335V 136K4", what does ...
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1answer
121 views

Why is my led not on?

Hello I’m just a beginner and I made a simple circuit with a resistor and a capacitor with a led in between. As I understand the capacitor just accumulates the energy but why is my led not going on? ...
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1answer
147 views

Are these really capacitors?

I've bought a beginners' electronics kit, which has some electric components and things, and a book with several projects. There is a list with all the components in the kit. There are 3 different ...
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2answers
123 views

What is this, a capacitor, if so what value. It's a mystery to me

If anyone know what kind of electrical component this is can you help me identify it please. Here is a picture, and I do t remember what I pulled it from.
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73 views

Stumped about how this switching circuits system works

I have stumbled upon this circuit from an online electronics course (https://pirateselectronics.teachable.com, chapter "Dual Flash Lights"): The behavior of this system is that both LEDs switch on ...
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4answers
101 views

Capacitor bank as a constant current source?

Can a capacitor bank of high power density, be integrated to a circuit such that it acts as a constant current source to a load? Even for a short duration of time.
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1answer
726 views

What is this substance on board?

So I’m trying to fix my blu-ray player and there are two spots where this beige stuff is. Is this there intentionally, or is this the result of some malfunction? Could someone please explain what it ...
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3answers
67 views

How to connect this 3 wire AC motor?

I have this NEW heat recovery unit from Amazon (shady quality, branded as made in UK but actually made in China) with this motor inside. It was supposed to have two speeds (Low/Hi). Question: How ...
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1answer
75 views

Is this notation for a single capacitor or a dual capacitor?

So Im trying to repair the indoor fan on our ducted AC system (2 weeks wait to get it replaced on warranty). Capacity has exploded. I replaced it with a similar cap (8uF 400v) and wired it the same as ...
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1answer
32 views

DC-Link capacitors sizing for 3 phase inverter, which is feeding BLDC motor [closed]

I would like to ask about an estimate for inverter DC link capacitors, where this inverter will supply 48V 20A 3phase Brushless DC motor and it's driven using a 5 kHz PWM.
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3answers
162 views

What happens to the energy stored in a short-circuited capacitor?

Suppose we have an ideal capacitor with a certain voltage between its plates. We connect the two plates using an ideal (lossless) wire, so the capacitor discharges. Where has the energy having been ...
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1answer
54 views

Connecting bandpass filter to comparator generating excess noise

I have a band pass filter with a center frequency of 100kHz, a bandwidth of 10kHz, and a gain close to 1. Input signal is 100mV-150mV peak to peak with frequencies varying from 80kHz to 120kHz. I am ...
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0answers
25 views

Programming AT89LP52 microcontroller like an AT89S52

I'm trying to run my code on the new AT89LP52 chip which Microchip (A.k.a. Atmel) believes can be a direct replacement for the AT89S52. I am able to program the AT89S52 with my programmer and ...
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1answer
93 views

Radial capacitor marking

I have radial capacitors with markings 235 RCN on one side and 333 C5K on the other side. How do I interpret these? Front side: Back side:
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1answer
275 views

What might this term (N sub C) be, calculating ripple current for a buck converter output capacitor?

I'm reading through the datasheet for TI's TPS54302 step-down converter, and determining values for support components. There is a calculation to determine ripple current for the output capacitor ...
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4answers
146 views

Decoupling Capacitor Usage Conditions

I understand that decoupling capacitors are small capacitors (often 100nF) used on VCC/VDD on ICs. When are they most required and when is it just silly using them on every IC. Are they better used ...
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2answers
46 views

Impedance of individual component in complex AC circuit

In a AC circuit with just a capacitor or inductor, reactance is the impedance of the component, and in a non-complex RLC circuit you can just find the total impedance with vector addition (Ztot = sqrt(...
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1answer
103 views

Why Current draw in DC variable power supply is not sizable?

I have done a DC variable power supply, and checked it using multimeter the output voltage ranges from 1.3v to 19v, but the problem is when I added a DC load(small DC motor) it was not working, why? ...
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2answers
36 views

Replacing a Capacitor on an Onkyo HT-R960 A/V Receiver

I have an Onkyo HT-R960 receiver that's been acting very flaky for the past couple of months. I've had to let it warm up for several minutes before being able to use it. I would also have to turn it ...
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1answer
48 views

How to choose a output cap for a 5v buck converter

I am designing a 5v buck converter as a side project, what kind of output capacitor should I choose?
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2answers
56 views

Choosing inductor and capacitor for boost converter

I am working on a IoT project that involves an arduino and a 4G LTE module. The device will be operated with two Alkaline batteries. Both the arduino and LTE module require 3.3V input so I want to ...
4
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4answers
519 views

Use audio frequency to light up multiple LEDs

Need some help here - I need to light up about 20 different LEDs based on the frequency input(200 Hz-20,000 Hz) Eg: The circuit should light up the 1'st LED when the input frequency is between ...
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1answer
43 views

Realizing 2 Resistors are in series in an RC circuit

I understand that when the switch is open, the capacitor acts like an open circuit & therefore the current in the capacitor branch would be equal to 0. When I solved the circuit using nodal ...
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1answer
65 views

Problem about the price of some SMD components

I'm finding for some SMD components such as MLCC(Multi-Layer Ceramic Capacitor)s. I tried to find both inexpensive and regularly-sized(which in my words this mean 'comfortable to solder with my hands',...
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49 views

Transformer Damage

I recently tried making a HV power supply as per the link (I know it’s very dangerous, lesson learned). I used a pencil type ignition coil in series with a light dimmer and a 5nf capacitor. I ...
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1answer
79 views

Which load resistance is connected to generator U2?

I have this op amp and one of the questions says Which load resistance is connected to generator U2? This is my attempt but I can not confirm if it right. No it's not homework, it examples I'm ...
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0answers
43 views

RLC circuit with intial conditions

The circuit I have is given by the following schematic: simulate this circuit – Schematic created using CircuitLab I know a few things: The current in the circuit at \$t=0\$ equals \$\text{I}...
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0answers
20 views

Discrete solution for alternate zero (low) and one (high) at output? [duplicate]

I am trying to figure out a discrete solution for alternate low and high at the output for varying input. Consider the discrete solution as a block. Input to the system consist of a push-button. ...
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2answers
65 views

Capacitor for 5V to 3.3V on AMS1117 voltage regulator? [duplicate]

I have ESP32 with several modules attached which require 1A 3.3V. I am planning to use 5V 3A power supply which then step down to 3.3V with AMS1117. How large capacitor need to stabilize AMS1117 ...
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3answers
709 views

If temperature is not an issue, what can be said about the different ceramic dielectrics

Let’s assume we have a circuit whose operating ambient temperature range is well-regulated to 25+-5C. Besides cost, what would be the use cases for the different ceramic dielectric types? In other ...
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28 views

RLC series circuit with initial current

I'm trying to solve, for the voltage across the capacitor in the following circuit: simulate this circuit – Schematic created using CircuitLab The initial current in this circuit is equal to \$...
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1answer
52 views

Analyzing circuit with dirac delta current source without using Laplace transformation

At \$t=0\$ the switch is closed and \$v_o(0)= -5 V\$. The problem asks for \$v_o(t)\$. I did it using Laplace method and get $$v_o(t)=5+10\,e^{-2t}$$ which does not even satisfy the initial condition,...
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3answers
90 views

Why does a capacitor not discharge in the same cycle it is charging in a clamper circuit?

As far as I understand, in an AC circuit, a capacitor is supposed to charge as the voltage is increasing, and as soon as the voltage starts decreasing, the capacitor starts to discharge (Since it is ...
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1answer
114 views

Ignition coil HV power supply damage?

I recently built a HV power supply, as per the link (using a pencil ignition coil). However, I used a capacitor of around 5nf, which meant the supply did not work. The capacitor reduced the amps too ...
1
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2answers
74 views

Confusion with Applications section of components

Im recommended to install a 10000uF Aluminium Electrolytic capacitor for a 72 DC-link of an inverter for regenerative purpose. When it comes to details, one manufacturer mentions "inverter" in ...
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0answers
132 views

How can I estimate the value of the capacitor in my SCR turn off circuit?

Morning everyone, my name is Rachid and I am a student in electrical engineering. I am currently working for a school project on an extinction circuit for an SCR. The diagram can be seen below. The ...
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0answers
43 views

Old capacitor having unknown ratings

I found a capacitor having the following written on its case: 360SV 160uF PHOTO 55 degree Celsius A) What does SV mean in the first statement? B) What is the meaning of the third Statement? ...
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1answer
51 views

Boost Converter (TPS61322): Loop Stability with Large Capacitors

I am using a TPS61322 boost converter to convert a minimum of 1.3V (single-cell alkaline) to 3.3V (using the TPS613221A version). This device needs two passives: an input inductor and an output ...
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1answer
32 views

RC Integrator mean value

i am trying to understand the behaviour of an RC integrator for \$f>>1/RC\$, i.e. in the integration domain. I know that at the capacitor i have \$V = \int V_{in}/RC dt\$; experimentally i find ...
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2answers
69 views

Trouble understanding this 'simple' circuit

I've been having trouble understanding this circuit, which is used in a larger circuit but this is the section which I can't wrap my head around. Valve7+ is always at +24V and when valve7 is high, ...