Questions tagged [capacitor]

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

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23 views

What is a “loading capacitor for pin parameter measurement?”

I am designing my first PCB with an MCU and I see this section in the datasheet that brings up a loading capacitor used for pin parameter measurement. I don't believe this is load capacitance for a ...
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2answers
49 views

Capacitance of semi-cylindrical plates?

For a visual reference of what I mean by semi-cylindrical plates check the diagram below. EDIT: The above diagram is not what I intend to implement. It is just to show anyone trying to answer the ...
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1answer
47 views

Missing component identification: capacitor or re

I have this circuit ( a remote controller) in which the antenna is desoldered and it seems there was a capacitor or a resistor ( red circle). Can anyone help me to understand what component could be ...
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60 views

Is it normal for a Guitar amplifier to have dc voltage across the output before a blocking capacitor?

I don't tend to post questions on online forums so I apologise in advance if I've messed up here. I'm currently trying to work on an old transistor guitar amp and in taking measurements managed to ...
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3answers
2k views

Why does this datasheet specify 12 100nF capacitors?

I am learning to make my first PCB with an MCU and looking at the Power Scheme, it asks for 12 x 100nF capacitors. My question is why have 12 of them rather than 1 x 1uF, and 2 x 100nF (I see that ...
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96 views

Voltage multiplier does not work

I have a built a simple voltage doubler. the circuit is as below: simulate this circuit – Schematic created using CircuitLab This represents only one stage, and my circuit has 4 stages. The ...
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1answer
33 views

Decoding date code on the reel [closed]

I receive a stock of capacitors with date code H4S-B mentionned on the reel , What does mean the date code ?
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1answer
83 views

What is Vout in this diagram?

I am trying to figure out how I can find Vout in this diagram I am sharing right now. I tried kirchoff but it does not seem helpful or possible to work with and I am assuming Vin is just an arbitrary ...
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33 views

Replacement Capacitors for VCR Power Supply [closed]

I am replacing a few capacitors in a VCR power supply. When searching on Digikey for new ones I put in the voltage, capacitance, polarization and package/case, however I am still getting many options. ...
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1answer
52 views

Is there something called as inrush current at the output of the DC-DC regulator or LDO

I am using this LDO to step down from 14V to 5V with a maximum output load current of 150mA. The above is the schematic of my LDO. I want to measure the inrush current of the LDO. But since I have an ...
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2answers
30 views

Differences in Metallized Polypropylene Film Capacitors

I have two capacitors, and they are both Metallized Polypropylene Film Capacitors, but they look pretty diferent to me, one is red, a little bit shiny with round corners like this: and the other is ...
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1answer
36 views

Thin film capacitor for voltage multiplier

I am designing a voltage multiplier with 5 to 10 stages. I have this circuit where I run a transformer at 450KHz and feed the output to the voltage multiplier. Is it a good idea to use thin film ...
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3answers
83 views

Have a resistor on for 400 ms then change path to a lower resistance

I'm building a guitar effect with a PT2399 IC. This IC needs a 2.2 kΩ resistor connected to pin 6 for the first 400 ms after power is applied. After that 400 ms, it can be as low as 100 Ω. I'd like to ...
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44 views

Questions regarding transistor audio amplifier circuit

I have a few concerns with the audio amplifier part of my circuit which I hope somebody can help me with... It's part of a larger circuit but the schematic below shows the parts of the circuit which I'...
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1answer
53 views

What effect does the thickness of metal plates have on capacitance?

Clearly a decrease in thickness of the dielectric increases capacitance, but how about the metal plates on a parallel plate capacitor? If you increase or decrease the thickness too much will you see a ...
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1answer
55 views

Replacement of a safety capacitor

I would like to know if I can replace a safety Y2 capacitor (222m 300V - which is a 2.2nf-)with a safety X2 capacitor temporarily. I'm in a hurry and I already ordered the replacement part but while I'...
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1answer
57 views

What can make a ceramic capacitor blow?

I'm looking at this Power board of a non-working TV and noticed a ceramic capacitor with a bit of the ceramic blown away. I'm not entirely sure if this is the reason why the TV isn't working; though ...
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1answer
72 views

How does a relay or switch work with batteries or capacitors?

I am charging my capacitor so it can act as a battery for a short period of time. I already did the calculations for the battery discharging and charging. My problem is now that I have a load, I want ...
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1answer
52 views

Is there a chance that this will still work after replacing the capacitors? [closed]

PCB from an acer monitor. I just plugged it in and it went up in smoke. i opened it up and saw that the capacitor is leaking fluid. will this burnt pcb still work?
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41 views

PT2399 delay chip feedback issue

I'm facing a strange issue which I can not identify. The circuit is the basic PT2399-based echo. My components setup is based on the research of similar circuits: The problem is that I'm not getting ...
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64 views

Can anyone identify this capacitor and its rating?

It's got the company brand name, but they have not responded. Company is JAMICON.
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2answers
50 views

Time interval quantized?

We have a capacitor fully charged with some voltage. At t=0 we can find the current. This current will change the voltage of the capacitor. However the information of the change of the voltage of the ...
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2answers
76 views

Capacitor in AC op-amps [closed]

Need clarification on why is a capacitor connected in AC op-amps but not in DC? And what does this capacitor do?
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1answer
54 views

Interrupt deduplication with discrete components

I am playing with interrupt mode 2 on a z80. Once pulled low it will disable interrupts and make a subroutine call to 0x0033. Before returning from the interrupt handler, interrupts should be ...
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2answers
90 views

Impedance in sine DC

If we have a DC sine signal. Can we say that capacitors and inductors have impedance despite not being AC? If yes then what will the formula look like? And the opposite if we have an AC square signal ...
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3answers
99 views

Replacing the capacitor on an old Philips amplifier

My Philips amplifier broke down (model FA153) and my friend told me it's likely the capicators have worn out (they were produced in West Germany ;)) I am quite the layman in electrical engineering, ...
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1answer
51 views

What capacitor do i need for a 3phase 50HP motor

Hi currently have a 3phase 50HP motor with an 80% Power factor I need to bring it up 95% power factor. What capacitor size would i need to achieve this. If someone can show the formulas they used that ...
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2answers
54 views

Capacitor NP in schematics

What type of capacitor is the one shown in the schematics as NP?
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2answers
74 views

DIY Pierce Oscillator not working

I'm building a simple pierce oscillator for fun and trying to read the frequency using an arduino uno and the freqcount.h library (I don't have an oscilloscope). However, I'm consistently getting a ...
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1answer
66 views

Finding practical solutions for discharging and charging a capacitor

I am wondering can I charge and discharge a supercapacitor at the same time like a battery. I have 1.3V going into a 10F 2.7V capacitor in series with a 0.5 ohm resistor. I calculated it will take ...
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1answer
44 views

Can multimeter measure 3200µF if capacitance measuring range:10p…40n/400n/4µ/40µ/200µF?

A multimeter that has this specifications: Capacitance measuring range:10p...40n/400n/4µ/40µ/200µF will not be able to measure a 300µF or 3200µF capacitor? That's how it sounds, but I want to make ...
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70 views

Why are these capacitors used in this circuit?

Why are capacitor C1 and C2 used in this circuit?
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1answer
47 views

Bulk Capacitor for Full Wave Rectification

By using notes from C.Basso Bulk Capacitor Calculation, I managed to plot the ripple curve for bulk capacitors for offline converters. This bulk capacitor location: Assume that my system is AC/DC ...
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1answer
64 views

Unsure Whether PCB Components Are Leaking [closed]

I am having problems with my air conditioner as it does not seem to be able to cool the room well. The fan seems to be a bit slow, so I opened the AC and check the PCB as some tutorials on the ...
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20 views

Charge through a time-varying capacitor

If a capacitor has a time-varying capacitance, such that C(t) = C_0 + Kt, where K>0 is a constant. Then is charge-voltage relation, Q(t) = C(t)V(t) = (C_0 + Kt)V(t), valid? It should be noted that ...
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5answers
110 views

Capacitors: 200 mOhm ESR @ 100 Hz, attainable?

The MLCCs in 0805 case seem to have one or two orders of magnitude higher ESRs at that frequency. Are there any such low ESR caps out there, preferably 0805 MLCC but not compulsory? It is a 220 nF cap ...
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49 views

How can I wire this motor’ capacitors? [migrated]

I am trying to repair this low viscosity fluid pump, I have the original start and run capacitors but do not know how they are wired. When I found the pump Z2 and U1 were connected between which ...
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1answer
61 views

Can I increase my power output from my solar panel using a capacitor?

If I have a 3V, 70mA solar panel rated at max 210mW. If I design a RC series circuit with it, can I increase the power outlook to about 2W? If so, how can I determine the time it takes to charge? Also,...
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1answer
642 views

Sewing machine motor repair

I'm a sewing machine mechanic, trying to increase my electric motor knowledge. I have a Bernina 830 sewing motor where the carbon brushes ran down and the wire damaged the commutator and ran a groove ...
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1answer
34 views

Need help identifying capacitor values from monitor PCB

I am trying to replace the SMD electrolytic capacitors from an LG E2442 but I am getting confused in regards to determining the correct values. I am trying to determine three different cspacitors ...
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2answers
69 views

How would this circuit work? Would the LED behave like a strobe?

I have placed a simple picture of the circuit I am trying to determine the behavior of. It is just a simple voltage source like a battery in series with a capacitor in series with an LED. To my ...
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1answer
87 views

How can I power my device using a Solar Panel and capacitor bank?

"I want to power a module that requires 3.3V and 500mA minimum for startup. I have a solar panel that outputs max 3V at 70mA and a 3.3V 3A max output boost converter. I know I need a super ...
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2answers
59 views

Calculating capacitor capacitance between collector and emitter in radio circuits

In many radio transmitters and receivers there is a capacitor between emitter and collector. As shown in this answer this capacitor gives positive feedback to prevent decay. My question is that, how ...
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1answer
59 views

Trace fork for bypass capacitor OK? Why?

I was placing some components on PCB recently, and, being relatively new to the subject, there are still things I miss out in terms of knowledge even though I try to google every question that comes ...
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3answers
57 views

LC receiver - resonance frequency

I am building simple LC receiver. I have to use a 30 mH coil and "catch" 30-40 kHz frequencies. By my calculations I need to use +- 800 pF capacitor. Unfortunately I have only 100 pF ...
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1answer
63 views

Powering buck converter using charged capacitor

Is it possible to design a buck converter using a charged capacitor to get regulated voltage output? When the capacitor voltage falls below some threshold value the inductor should be able to provide ...
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2answers
43 views

What are the ways that change in capacitance can be measured?

What are some ways that capacitance change can be measured e.g in a capacitive pressure sensor
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1answer
29 views

How to run a car radiator with a PC 450w SMPS?

I have a car radiator fan which when measured with a multimeter on a 12v car battery draws 4.7a. I've been trying to run it off an old PC SMPS which is rated at 450W with max amperage of 18a at 12v. ...
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4answers
898 views

Are higher rated capacitors interchangeable with lower rated ones?

I have the follow capacitors that I need to change: I can't find these specific ones on mouser or digikey and I can't buy in such huge quantities neither if they did have. I was told that I can use ...
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52 views

ATX power supply turns off when used with DIY boost converter

I am trying to build my own step-up boost converter. I have my connections as shown in the following schematic (except for the one circled in red.) First I powered up my step-up module with a ...

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