All Questions
Tagged with capacitive capacitor
18 questions
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Ultra-fast load switch
I have a question that I am assuming has a very easy answer (hopefully). I am trying to turn on and off the power to a pcb really fast, on the order of 1us. My problem is that my board has some bypass ...
- 15
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1
answer
142
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How to detect which pins on a pin display are touched using capacitive sensing
I'm working on a project to apply touch sensitivity to a modified pin display (30x30). The goal is to allow someone to interact with the display through their fingers and ideally touch.
We initially ...
- 73
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1
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225
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Why are parasitic capacitances the main factor for limiting high frequency performance of active devices such as transistors? [closed]
According to the Wikipedia article, the reason for the limit of frequencies in which transistors operate is the parasitic capacitance. But I don't understand why this is so.
Wikipedia article:
...
- 141
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2
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524
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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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2
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80
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How is the (dis)charging process of capacitors in series calculated?
How is the (dis)charging process of capacitors in series calculated?
I know that
$$C_{total}=\frac1{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}$$
$$Q_{total}=Q_{1}=Q_{2}=Q_{3}=...$$
$$V_{1/2/3}=\...
- 178
6
votes
3
answers
381
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Headphone Noise from Laptop SMPS
I have been facing an issue that has been a mystery to me for quite some time, and I wanted to see if someone here can potentially give me more insights on this so I can understand why it is happening....
- 61
4
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4
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352
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Why is this camping light deadly?
I am learning, so go easy on me, if you can.
In a video with BigClive, he takes apart a camping light and says it's deadly when you have mains plugged in and usb plugged in at the same time. In that ...
- 143
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1
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54
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variation of thickness of dielectric layer for different textile-based capacitive pressure sensors
For my thesis I am working with textile-based capacitive pressure sensors and I am struggling to see how much variation in thickness of the dielectric layer you can have before you have noticeable ...
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0
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146
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Finding the equivelent capacitance of the circuit
Finding the equivelent capacitance of:
simulate this circuit – Schematic created using CircuitLab
I think that it should be:
$$\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}}+\frac{1}{\frac{1}{C_3}+\...
- 31
1
vote
1
answer
339
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Capacitive projectile triggering touch screen
I've read through a number of questions (How can a capacitive touch screen be triggered without human contact?), (How to use a capacitive touch screen without a human hand), (What is the minimal ...
- 275
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1
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93k
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How do I find C & L from XC and XL?
Calculating Capacitance and Inductance from Capacitive Reactance and Inductive Reactance
I'm trying to find the inductor (L) and capacitor (C) values using the inductive reactance (XL) and capacitive ...
user126396
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1
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1k
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What is the minimal capacitor (capitor type/size/capacity) needed to fool a capacitive touch screen? [duplicate]
Say I want to provide a device (completely batteryless of course, and detached from any human touch) the capability to immitate a touch on a capacitive screen (Galaxy S6 here). I know I just need some ...
- 111
3
votes
2
answers
195
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Finding the touching angle on a touch-screen?
I am wondering if it is possible to detect from which direction (or at which angle) a human touches a touchscreen.
Imagine something like this:
Is there any technology out there (e.g. special ...
- 133
-1
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2
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481
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Capacitive ECG electrodes and capacitor discharge
I am trying to make ecg electrodes with capacitive coupling. Since my capacitor is only about 10 pF at max and I have to have as low cut-off frequncy as possible, I came up with a circuit like this. ...
- 1
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1
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231
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Calculating the voltage out of this particular cap coupled circuit
Before I get to my question, I'll just go over the input and output of the circuit from what I "know". The base of the BJT gets a 20 microsecond pulse that puts the bjt well into saturation and "VOUT" ...
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1
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4k
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Water level: BIG capacitive level sensor with steel bars?
So I want to measure water level under a bridge, or inside the city drain.
Would it be possible to run two long (4 meter) metal probes, each one enclosed inside a PVC pipe, and placed one next to the ...
- 207
1
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1
answer
184
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Thermoplastic-based touch panels: why not?
(I'm new to EE.SE, so I don't know if this is on-topic here. Please forgive me.)
From what I understand, capacitive touch technology relies on coating one side of a resistive material with a ...
- 264
3
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318
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Formulas for Integral Components
Formulas for Integral Components:
I am looking for "simple" approximative formulas for integral components. In particular for:
A grounded interdigital capacitor (i.e. above a ground plane and with ...
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