Questions tagged [capacitor]

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

Filter by
Sorted by
Tagged with
-2
votes
0answers
46 views

finding the voltage on the capacitor and its charge

Looking at number 17, I need to calculate the voltage and the charge on the capacitor. Below the given info about the resistors is the solution so ignore that. I calculated the total resistance but ...
6
votes
4answers
1k views

Limiting 1000uF capacitor inrush current to protect fuse and power source

I have a WS2812b (neopixel) strip controlled by Atmega and powered by 5v 2Amp cell-phone style charger (from digikey). The strip itself is located about 1.3m away from the power source and MCU. Whole ...
-1
votes
1answer
60 views

Capacitor? Replacement with what value

I have never seen this kind of component. It looks like a resistor but the symbol and name says it is a capacitor. Assuming it is a capacitor and the colour code brown black yellow the colour code ...
1
vote
2answers
89 views

How long does it take to charge up a capacitor

I am using Esp32 to control a NRF24L01 with antenna To power the solution I am using a HLK-PM03 which provides a 3.3V Output. I was thinking of using 470uF capacitor (other suggestions are appreciated)...
2
votes
1answer
56 views

555 Timer Switch Circuit Operating at 12V Problem

I have designed a prototype PCB for a product we are working on. It works, but with minor problem the PCB should be able to be supplied from anything from 5V - 12V. The problem is the 555 timer ...
-1
votes
2answers
65 views

Calculate capacitance given I and V graphs

There's this question which asked us to find the capacitance value give both (v-t) and (i-t) graphs for capacitor. Here are the graphs: This is how I calculated the capacitance: It was obvious from ...
0
votes
3answers
81 views

Explanation about op-amp bias resistor and bootstrapping

I am reading a book on op-amp and its applications in linear-integrated circuits and came across this topic of creating an op-amp circuit with very high input impedance. I believe that I understand ...
-2
votes
5answers
92 views

With an LM741 can I power this circuit in such a way that there is enough current to power the base of a transistor? [closed]

With an LM741 can I power this circuit in such a way that there is enough current to power the base of a transistor? I intend to connect an output of this ckt to the base of a transistor.
0
votes
0answers
38 views

How to arrive at capacitor value for a given power? [closed]

I am trying to find the capacitor value at the Vout for a given power of 0.2W , voltage of 1.8V. I have considered equation P= VI, C=Q/V. I want to analyse the power consumption by AES algorithm ...
2
votes
2answers
300 views

What capacitor voltage rating should I use?

I am designing a PCB layout using the SIC438AED-T1-GE3 buck converter. I am trying to understand what voltage the 'PHASE' pin will have, as it needs a capacitor like this: I need to know the voltage ...
0
votes
2answers
60 views

How to do a SPICE DC simulation with capacitors and get the correct final voltage?

I have a circuit with a capacitor attached to the output node. If I do a transient simulation, I can see the output voltage slowly rise until it reaches its final value. I am trying to find the ...
0
votes
2answers
180 views

Capacitor with four pins

What is the correct name for the four pin capacitor shown in the diagram? It is an LMH0341.
0
votes
0answers
47 views

6V DC motor with resistor in parallel

I've disassembled a motor from the little car for children. It was run on 6V battery, and all it used is a dpdt crossover switch for forward/reverse and "gas" pedal. I'm not quite sure why ...
-2
votes
0answers
34 views

High voltage input of inverter circuit

Above is a 12V DC to 120V AC inverter circuit and its step up voltage. Question: Is it possible to step down, which means 240V DC is being stepped down to 12V AC because if the mosfet and transistor ...
0
votes
1answer
41 views

Can an auto reset fuse and capacitor save my tracking device from surges while keeping it running?

I work with a few tracking devices and the newest model keeps popping. I've narrowed it down to possible short term current spikes in the trucks they are installed on. The device receives power from ...
-2
votes
1answer
71 views

ESD damage to old system [closed]

I was doing a capacitor check on an old xbox motherboard. I always knew that you could damage a motherboard by touch but at the time either my mindset was off or overconfident in its supposed rarity. ...
4
votes
3answers
245 views

Ceramic capacitors shorting on power up

I have a power supply unit that is used to drive a couple of relays. Rarely but sometimes the input capacitors (C218, C200, C201 and C207) to the switch (U202) short when the power is turned on (230V.)...
0
votes
1answer
61 views

5 V car accessory problem [closed]

I have installed a car dashcam which is hardwired into the fuse box. The camera detects the voltage to switch between driving and parking modes. When the ignition is moved from on to engine start, the ...
1
vote
2answers
57 views

ESD protection on floating circuit - Capacitor from circuit ground to earth?

I'm not very familiar with proper ESD protection and wondering about the correct implementation of a TVS diode to protect an input of an isolated circuit. In the case of an ESD event into the ...
1
vote
1answer
38 views

For calculating inrush current in a ceramic capacitor , do we need to consider the effective capacitance after derating for dc-bias effect?

Inrush current happens when capacitor is initially charged from 0V to the intended rail voltage. What should be the effective capacitance to be considered during this charging? -Since the voltage ...
0
votes
1answer
31 views

Feedback loop design (buck converter): Output capacitance- effective value or nominal value to be considered?

In this TI datasheet of TPS62180, it was mentioned that the LC filter combination should be selected from a set of predefined values. I understand this is usually the case for an internally ...
-1
votes
2answers
100 views

Electric capacitors instead of earthing electrode

I'm going to make a partial EM-shield (using aluminum) for my 3G USB (2.0) modem, and I need to "ground" electricity from the surface of that shield. Daily worktime for that 3G modem is ...
1
vote
1answer
68 views

How to use an LC stage as a voltage amplifier?

What I have done From my simulation here, I have tried using a parallel LC stage as a voltage amplifier at resonance. $$f = \frac{1}{2\pi\sqrt[]{LC}}$$ $$L = 0.001$$ $$C = 10 \cdot 10^{-6}$$ $$\...
-2
votes
3answers
59 views

On what basis is the load switch input and output capacitance recommended in datasheet?

I am seeing different output cap recommendations for 2 load switches with similar specs. What is the basis for this calculation? SLG5NTH1011V SLG59H1017V
1
vote
1answer
48 views

Why is the input capacitor calculation different in TI datasheet?

Below is the input capacitor calculation from TI datasheet Why is it different from standard buck calculation given below? Another TI dcoument
0
votes
1answer
60 views

Can I replace a single layer ceramic capacitor with a multilayer one?

I have this circuit that you consisted of an RC filter for a two-wire endstop, the circuit works fine but apparently they no longer manufacture single-layer 100nF capacitors, they are only found in ...
0
votes
1answer
36 views

Prevent spark/surge when connecting power cable (charging input bulk capacitor)

In cheap off-line AC-DC SMPS you will probably notice a huge spark when you connecting the PSU to mains. That usually won't cause problem because your mains is far more capable to handle that surge. ...
1
vote
2answers
72 views

how does the differential equation for a series RC circuit behave?

I am analyzing a simple series RC circuit. I have the equation that describes the current set up but I don’t understand it. In the picture below, wouldn’t the di/dt term be 0 instantly because of the ...
0
votes
0answers
41 views

I have a carvin v3m 50watt tube amp head, red plating/bias help

The amp has 4 el84 tubes and 4 12ax7 pre amp tubes, the amp lost about half of its volume and the power tubes are red plating, is there any thing other than the tubes that I should be looking out for ...
0
votes
1answer
52 views

Formula for sizing an induction suppression capacitor

I’m using a set of 12vdc wireless relays to control a 12vdc solenoid and a 120vac, 1.6 amp motor. The relay manufacturer recommends an induction suppression capacitor to protect the control ...
0
votes
0answers
43 views

Building a hybrid ultra-capacitor and battery bank

I have a project that I need input on. Is it possible to build a hybrid bank out of ultra-capacitors (UC) and batteries? The generalized flow of the system I'm thinking is from solar (48V) to UCs (48V,...
2
votes
0answers
103 views

Capacitance through a diode

As I was designing power circuit, I have a place where two power rails come together with Schottky diodes (power from battery vs power from charger,) similar to what you can find in phones or laptops. ...
0
votes
1answer
68 views

Capacitance of current carrying wires (Transmission Line)

Let me explain my primitive understanding of a capacitor. In electrostatics, a conductor containing accumulated charges attracts opposite charges in a conductor that's separated by an insulator, this ...
1
vote
0answers
34 views

Capacitor value for low load capacitance crystal [duplicate]

The crystal I want to use is the ABM8W-12.0000MHZ-4-B1U-T3 (datasheet). I know that to calculate the capacitors for a crystal is: CL = (C1 * C2) / (C1 + C2) + Cstray However, the load capacitance of ...
1
vote
2answers
56 views

Charge pump circuit- What is the need for caps near CLK pin?

Below is a charge pump circuit in NB680 IC Datasheet I was trying to understand the charge pump functionality by comparing it with the standard circuitry shown below: https://www.edn.com/capacitive-...
0
votes
1answer
27 views

Question about inductors in the form of magnetic fields [closed]

Could you please explain this sentence: Inductors build up energy in the form of magnetic fields, and become more conductive.
1
vote
1answer
76 views

Power a servo momentarily using a capacitor for geocaching

I'm trying to build a cache for geocaching based on a movie - The Boy Who Harnessed the Wind Those who don't know what geocaching is, please visit here. It is a fun activity. I have this idea for a ...
1
vote
2answers
85 views

Calculating the parasitic inductance of a capacitor

I have looked at this article, but it does not answer my question. My question is: how would you go about measuring and/or calculating mathematically the self-parasitic inductance of a capacitor if I ...
3
votes
1answer
144 views

Proof of capacitive reactance equation

I have a doubt about the ratio of potential difference and current of capacitor $$X_c = \frac{v}{i} = \frac{1}{\omega C}$$ If I have a sinusoidal potential difference $$v = V_Msin(\omega t)$$ and the ...
1
vote
1answer
146 views

Capacitor blows up in TV power supply circuit

I have an LED TV Samsung T22B350EW (Type No.: LT22B350) which can not power on. I'm trying to fix it, to learn more about such type of circuits. A capacitor in its power supply board is blown up. The ...
0
votes
1answer
70 views

What resistor is needed to discharge a capacitor of about 3kV (inside a microwave)

I've already made a capacitor discharge tool for a 300V capacitor and works fine using the 2 resistors that were on the PCB with the capacitor. I need to upgrade this to discharge a microwave ...
6
votes
3answers
1k views

How to determine value of a smoothing capacitor

A friend (who knows even less about electronics then me!) asked me if I could build a circuit that can convert 8v 50Hz AC into a DC power supply so he can power a small board that is normally driven ...
-1
votes
2answers
55 views

Inverter circuit (DC to AC) [closed]

Hi readers, above is an inverter circuit that converts DC to AC. How do I increase the output voltage and decrease the frequency to let’s say 60 Hz? Above pic is the voltage I measured at AC (Vout).
-1
votes
1answer
103 views

How long does it take to charge a 1 uF capacitor with full rectified 5000V output from a flyback transformer? [closed]

If the voltage is 5000 V and the maximum available current is 20 milliamperes, and there's a 1uF capapacitor and 100 ohm resistance of the secondary. We can ignore the internal resistance of the ...
0
votes
3answers
73 views

LTspice anomaly with pico-Farad capacitors - minimum 20µs rise-time?

Why is it, if a 28800pF (28.8nF) ideal capacitor and 4Ω resistor are in series with a voltage source, that source rises linearly to exactly t=20µs? For C=2880pF, I expect \$5\tau=2880\text{pF}\cdot4\...
0
votes
2answers
92 views

RC circuit with time varying capacitor

I am considering a series RC circuit with a voltage source. simulate this circuit – Schematic created using CircuitLab The capacitance of the capacitor varies with time. I am doubtful if this ...
2
votes
1answer
94 views

Need help with a resonant frequency question

I DON'T WANT THE SOLUTION I just don't understand where the "100" (highlighted) came from.
-1
votes
1answer
46 views

Increase power of load in AC to DC converter

Hi readers, above is a ac to dc converter. I want to increase power output of the load and that's why I put the load resistance to be much lower than the series resistance(internal resistance). ...
0
votes
2answers
40 views

Parallel versus series capacitor bank

I DON'T WANT THE SOLUTION I only want to know if the question said that the capacitor bank will be connected in SERIES with the motor. Will it have the same value of capacitive reactance? Will a ...
0
votes
3answers
97 views

Is this capacitor graph safe to be constructed?

Above is the power vs time graph of a capacitor charging & discharging in a rectifier circuit. It spikes between 350 W and -140 W, which is extremely high. However, the average is only 2.7158 W. ...

1
2 3 4 5
102