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

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31 views

how to transform an audio signal in square saw or sine wave? [on hold]

What is the basic schematic to change an input audio signal to different wave shapes (sawtooth, square, etc)... i'd like to learn the principles behind it... links, books or online guides are ...
7
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1answer
346 views

Are my soaked capacitors still okay?

When the delivery man dropped my capacitors off earlier yesterday he did not ring the doorbell and I had no idea they had arrived on my front step. Then an intense rainstorm showed up and soaked the ...
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1answer
34 views

Why start and run capacitor is used and explain it operation?

What for start and run capacitor used in induction motor why it is not replaced for compensated winding in the motor and why run capacitor is different from start capacitor
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2answers
25 views

what is the Relation of Motor Starting capacitor with Motor speed?More 2 questions in Desc

Pre-Knowledge: I know we use capacitors in Single phase induction motor because with one phase the the net torque is zero and Rotor won't rotate so we add another winding perpendicular(with capacitor) ...
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2answers
34 views

Good inductor parameter for GHz frequency matching chosing

I want to buy inductor and capacitor for matching circuit of antenna in about 1.6GHZ. I searched the net for some inductor for ...
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2answers
43 views

Uninterruptible Power Supply… 110V AC and low current (60 milliamp)

I have a "smart" lightbulb that requires 110V AC input and uses 7 watts. Due to stormy weather here in Florida I have frequent but minor power outages that last seconds at a time. This smartbulb doesn'...
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6answers
84 views

capacitor with fridge

I have a tricky question for you. I'm trying to operate a 100w fridge using solar power, a car battery and an inverter. The inverter says that it's 2000w but it most likely seems that its a 700w but ...
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1answer
32 views

What does “Transient Response Recovery” means in the output specification of a AC-DC power supply?

I'm using a AC-DC power supply to provide 24VDC input to a PCB. A 100uF,35V tantalum is used as one of the filter capacitors for the 24V(same from supply) input of DC-DC regulator on PCB. In some ...
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2answers
62 views

What happens if I change the value of a coupling capacitor in a tube pre-amp

I own a Blackheart BH1H amplifier and am considering making modifications to change its sound. The schematic can be found here One change I have seen suggested is to change the value of C2 from it's ...
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0answers
39 views

Choosing the right diode for a 9v circuit with npn transistors? [on hold]

I'm super naive to this field, so pardon me if i sound stupid. i'm building a guitar stompbox and i want to use a diode to be sure the signal doesn't go backwards. how do i pick the right diode? are ...
-2
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1answer
56 views

Energy stored in the capacitor increase when the capacitance decrease [on hold]

Help!!!!Energy stored in the capacitor increase when the capacitance decrease.Suggest an explanation for this energy increase, making reference to conservation of energy. Question [paper 3,Q4(D)(ii)] ...
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1answer
49 views

unloading capacitor while measuring voltage with multimeter

I have load a 10nF capacitor with a bigger capacitor of 100 uF. Both have the same voltage but when I measure the voltage of my small capacitor I unload it to zero... How can I avoid this effect ? Is ...
2
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0answers
62 views

Using an automotive stereo capacitor for other uses

I am looking into using a capacitor to buffer voltage drops for a 12V solar power system. Since it seems I need a pretty big Farad number to give at least half a second of buffer time for my load, I ...
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2answers
963 views

Why is a capacitor used to protect CMOS chips? [duplicate]

I am studying digital electronics. A book says that "use a 0.1 μF capacitor between Vcc and ground for each IC". What does this mean? Why can a capacitor protect CMOS chips? Does it mean that a ...
1
vote
1answer
121 views

LDO has no output

I've been trying to get a fixed output LDO to work for the past few hours, in order to step 3.6 V down to 3.3 V, but I have been unsuccessful. I am using the MCP1824T-3302E/OT LDO. I have it wired up ...
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0answers
34 views

Mathmatically analizing different voltages in a phase changing circuit

I am trying to understand a phase shift oscillator from a mathematical perspective, and to begin I simply took the phase-shifting part of the circuit and am now trying to analyze the voltages as a ...
0
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1answer
47 views

I made a fluctuating circuit that controls an LED to be on or off, How does it work? [duplicate]

I have this circuit, The two ends represent the positive and negative terminals of the battery. Values R6-4.7K R1-470K R2-470K R3-4.7K C1-.1 uf C2-.1 uf All ...
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0answers
67 views

Is it possible to discharge a capacitor with linear voltage? [closed]

I want to use (a) capacitor(s) as replacement for a chemical accumulator for permanent delivery of constant voltage 12 V and 5W because I assume it's less vulnerable to fail at a point in time in the ...
8
votes
1answer
890 views

What does “NS” indicate as a capacitor value?

I'm looking at an application note, and it contains the following in the circuit diagram: What does the NS in the diagram represent? Or is this just a typo on ...
0
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0answers
69 views

Learning by doing - Fixing Turntable [closed]

I recently moved from Canada to Amsterdam. I blew my Stanton t.92 turntable (TT) by plugging it into the mains with a travel adapter (I know, lesson learned). Looking on the bright side I am using ...
0
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1answer
42 views

how to measure ac motor with AC ammeter

I have 3 different working motors ranging from 1kw to 2 kw (on 220V AC, 1 phase), they all use running capacitors. I tried 2 different AC ammeters on them and I get bad readings between 0 to 1 amp, ...
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0answers
43 views

why leading power factor cause rising system voltage?

why leading power factor will cause rising voltage? how can it happen in mathematical calculation? i think the voltage in power factor correction will be stable but the current will change because of ...
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2answers
70 views

Determining the input capacitance for a SMPS [closed]

I'm attempting to layout a SMPS using the LTC3703 chip, however the datasheet doesn't talk about the AMOUNT of input capacitance, just that it be low esr. However, it does talk about "bulk ...
0
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1answer
50 views

Calculating the leaking current for a tantalum capacitor

I've been looking at these tantalum caps for a coin cell operated BLE device, but I'm a little confused by specified leakage current. The datasheet lists the leakage current at <= 0.003CV uA. ...
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1answer
44 views

High Current Pulse Opamp 2.5% Duty Cycle

I am driving an IR LED (LED914 and LED907) in series at 4.5 A for 2.5% duty cycle, In the 28 V I connect a DC supply and set the current to 150 mA, the idea is to continuously charge the capacitor C17....
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1answer
61 views

What would happen if a diamagnetic material is placed within a capacitor, instead if a dielectric material?

In capacitors dielectric materials are sometimes inserted between the parallel plates. What would happen if a diamagnetic, or a paramagnetic material is inserted between the parallel plates of a ...
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0answers
50 views

An SoC pulling the power source voltage

I'm trying to power a SoC with a battery as in the figure below. The SoC in question is the WeMos, based on the ESP-8226. simulate this circuit – Schematic created using CircuitLab When ...
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1answer
46 views

Simple variable Capacitor circuit to feed ADC

I need to build a humidity sensing circuit that feeds an analogue to digital converter. (This converter is then going to send its signals to a raspberry pi for analysis etc). The sensor will be about ...
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2answers
75 views

Tantalum capacitor burning out

I am using a tantalum capacitor of 10 uF rated at 20V as a decoupling capacitor. It is placed in parallel with a 5V supply. Now when the circuit is powered, the capacitor burns out. I replaced the ...
3
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0answers
67 views

Electric circuit diagram proof check - simple

im completly new in this subject (electronics, i began today) and therefor quite the newcomer and would like to know if i understood the use of transistors and capacitors and the diagram in a whole. ...
2
votes
2answers
90 views

Can a single, large multilayer ceramic capacitor replace the classic electrolytic + ceramic decoupling capacitor arrangement?

In classic decoupling designs, it is common to see a large (10 µF or bigger) electrolytic capacitor in parallel with a smaller ceramic capacitor (in the range of 0.1 µF). The larger electrolytic ...
3
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2answers
149 views

why are capacitors often not labeled using engineering notation ? (1-999)

i see schematics with values such as .01uF among others... why out of all components are these not labeled using engineering notation
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1answer
59 views

Large current for a short amount of time [closed]

I need some help with design a circuit that could store charge and pump out 16 amps to a 1.5 ohm load for 3 seconds when discharge. The load is basically two resistors in parallel, each branch with 3 ...
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4answers
532 views

Why is an infinitely large capacitor a DC open circuit?

This really sounds like a stupid question, but I believe it's worth asking: Due to \$I=C\frac{dU}{dt}\$, and \$C\$ is infinitely large, any minor change in \$U\$ would result in infinite ...
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1answer
29 views

Why resonant charging produce “no current immediately after discharge”?

It's me again, still reading AoE 3rd. On page 40, footnote 35, the author writes: Resonant charging is used for the high-voltage supply in flashlamps and stroboscopes, with the advantages of (a) ...
1
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1answer
21 views

How to use BSIM3v3 capacitance for hand calculation?

As you all probably know, capacitances in BSIM3v3 are just the partial derivatives of the terminal charges with respect to the terminal voltages. They are not physical two terminal capacitors. Cij = ...
1
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1answer
48 views

What does an “ac coupled signal” mean?

I've heard this term many times from many different sources, but none of them gave me a definition. Here is my understanding: "coupled" means "connected together". If two circuits are "capacitively ...
4
votes
1answer
441 views

Large capacitors “producing more I²R heating”?

On page 35 of The art of Electronics Third Edition, when describing the disadvantages of reducing ripple by choosing large capacitors, the author writes: The very short interval of current flow ...
0
votes
2answers
41 views

Sizing of and Type of Power-loss / Brown-Out Protection Capacitor

I found a few resources and this question here: power-loss protection I'm using an MCP16301 step down regulator to turn 12v to 3.3v I'm having trouble determining I in this equation: C=I×t/ΔV with ...
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0answers
20 views

Ceiling Fan is very slow after 2 years operation [migrated]

I have a ceiling fan is working with very slower speed even selector is set to the max (5 speed) and what is the reason for that ? Is the reason damaging capacitor or any other reason ? I just ...
1
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0answers
69 views

chip resistor/capacitor size vs performance for analog circuits

I am designing one four layer ADS1298 (TI) based analog PCB. Signal frequency is about 1.5Hz to 3.79kHz. It is a four layer board with most of the components and traces on top layer and the ground ...
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0answers
20 views

Notice to the administrator regarding downvoting of questions [migrated]

I want to get it noticed by the administrator that our questions are getting downvoted which is debarring us from asking any further questions which is really creating constraints for us in our ...
1
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1answer
125 views

These 105ESM components appear to be capacitors. What are they, and which datasheet may I refer to?

I received a mixed-bag of various components from a friend and while I can identify the majority of them, there were a few of these inside. They appear to be small ceramic capacitors with a resin ...
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1answer
44 views

Is it viable to boost capacitor voltage to improve energy density?

Having a look at supercapacitors available on digikey they seem fairly expensive (say for example a capacitor with \$E = CV_{rated}^2 = 50 J\$ ). However, an equivalent ceramic capacitor energy-wise ...
1
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2answers
71 views

When using multiple capacitors for decoupling or bypassing, should they be placed as close as possible to each other?

It is often recommended to use multiple capacitors in parallel in bypass and decoupling applications, especially when working with frequencies above 50MHz. There is some argument whether its better ...
0
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0answers
70 views

External capacitor sizing on power supply

First off, please excuse my electrical ignorance as I am a mechanical engineer stepping outside of my boundaries. I am designing and building a servo motor (~180W rated power, PMDC) driven arm system....
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2answers
96 views

Op amp amplifier with capacitor [closed]

What happens when the resistors of an op amp amplifier circuit are replaced with capacitors? Or inductors? What is the frequency response of such an arrangement?
0
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1answer
62 views

What would be the waveform of output coming from rotary spark gap with ac input?

If I have an input of ac current 50/60 hertz into a capacitor of 40nanofarads and after that a rotary spark gap(2000-5000 discharge per second) , what would be the waveform of output? And how will the ...
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1answer
52 views

How to spec this capacitor

Im working from a reference design for an NXP home automation modem. The capacitor with the green arrow is well described. The capacitor with the red arrow is not. The schematic seems to suggest ...
3
votes
0answers
69 views

Asynchronous motor with motor capacitor sometimes won't run backwards when it should

The long story short: Is there any chance that an asynchronous motor with a run (or start?) capacitor fails to run backwards when the capacitor ages and loses a significant portion of its rated ...