All Questions
8 questions
1
vote
1
answer
142
views
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
1
vote
1
answer
225
views
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
0
votes
2
answers
524
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 ...
0
votes
2
answers
80
views
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
$$C_{total}=\frac1{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}$$
$$Q_{total}=Q_{1}=Q_{2}=Q_{3}=...$$
$$V_{1/2/3}=\...
- 178
0
votes
1
answer
54
views
variation of thickness of dielectric layer for different textile-based capacitive pressure sensors
For my thesis I am working with textile-based capacitive pressure sensors and I am struggling to see how much variation in thickness of the dielectric layer you can have before you have noticeable ...
- 1
1
vote
0
answers
146
views
Finding the equivelent capacitance of the circuit
Finding the equivelent capacitance of:
simulate this circuit – Schematic created using CircuitLab
I think that it should be:
$$\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}}+\frac{1}{\frac{1}{C_3}+\...
- 31
3
votes
2
answers
195
views
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
3
votes
0
answers
318
views
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 ...
- 5,239