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0
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1answer
26 views

Capacitive load at the output for analysis of CMOS cells

This question is very rudimentary one. Please point me to the link if this question has been already asked. In general, when working with simulations and and analyzing the standard cells designed ...
1
vote
4answers
164 views

How can I make a fine tipped object emit an electric field similar to that of a human finger?

I've asked this before, but knew less about the tech and didn't word the question properly. I know other people have asked similar questions and knew little, so let me be as specific as possible here: ...
1
vote
2answers
117 views

What exactly does a capacitive touch screen need to register input, and how can that signal be produced?

There are active styli out there, and they take 3A or 4A batteries and don't require any wireless connection. How do those emulate human touch? EDIT: I am specifically interested in iPad touch ...
0
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0answers
75 views

Using AVR with Waveshare capacitive touch keypad

I picked up a Waveshare capacitive touch keypad and am trying to get it to work with a ATmega1284P. I have the KEY1 pin connected to PB2 and the LOAD pin connected to PB3. I also have a HD44780 LCD ...
4
votes
2answers
270 views

Making a grounded object capacitive

I am trying to make a copper pipe which is placed in a natural park capacitive. It is placed in the soil meaning that it is already grounded. I am using a basic arduino and their capacitive sensing ...
0
votes
1answer
120 views

Looking for a transparent conductive spray/paint/ink

I know there are conductive sprays available, but these are strongly coloured due to the metals inside them. I am trying to make a (dry) wooden surface capacitive, but would like to have the feel and ...
1
vote
0answers
142 views

Split-phase 230VAC transformerless capacitive power supply for 5V@30mA regulated output — series cap?

I'm a hobbyist developing a hybrid power switch (electromagnetic + solid state) for a resistive electric stove (8kW max) top. I have a profoundly autistic, disabled adult in the house and I need a ...
-1
votes
1answer
136 views

Grounding Plexiglass

I have a sheet of plexiglass that has metal strips (Aluminum) that will be connected through wires to an Arduino. The Arduino is grounded but the metal strips are not. The metal strips will rest on ...
0
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0answers
50 views

Electronic membrane that can make touch screen react at certain coordinates

This might seem like a weird question, but I have an idea for a project and it would require an overlay on top of a touchscreen (capacitive) that ideally would let fingers work with the screen if need ...
3
votes
2answers
519 views

Capacitive AC voltage detection

As I understand it, a non-contact voltage tester works by creating a capacitive connection from a power line to ground, via the detection circuit and the operator's hand/body. This connection passes a ...
2
votes
1answer
155 views

Capacitive sensor circuit

I'm designing a capacitive proximity sensor for detection of human presence. My requirement is that I should be able to detect presence by monitoring change in capacitance at the highest possible ...
2
votes
2answers
236 views

Transistor selection for 5V LED circuit

I'm having a trouble selecting the proper transistor to switch this LED circuit simulate this circuit – Schematic created using CircuitLab The LEDs are 3.6v at 20 mA. I tried figuring ...
0
votes
2answers
241 views

ESD protection of capacitive touch doorknob circuit?

This is a follow-up to my question: How can I use a generic doorknob as a capacitive touch sensor? I am now ready to move beyond the proof-of-concept stage, but I have not yet learned of a ...
-2
votes
1answer
742 views

Glitchy Touchscreen Caused by Charger [closed]

I recently bought a Nexus 4. I had a couple of spare chargers laying around. I used a charger that apparently had an issue exactly like: https://www.youtube.com/watch?v=mrpBTG0a6K8. If I used my own ...
3
votes
2answers
211 views

What are those black things on the board?

I'm a beginner in electronics, and I'm ignorant of many basic things. Check out these black things on the board: These are from a keyboard. I'm disassembling it and I want to connect my own ...
0
votes
1answer
1k views

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 ...
3
votes
3answers
2k views

Simplest touch sensor for a copper surface

I'm looking for the simplest way to implement a binary on|off touch switch using a single pole. The touch surface is copper. The position or pressure of the touch is not needed, just simply: On = ...
3
votes
2answers
800 views

Designing a Transformerless power supply

I am working on a transformerless PSU for maiking a 3nos.x3 watt led, each having forward voltage around 3.6v and current around 650-700ma. I have worked on this kind of circuit: I guess a 1uf ...
11
votes
5answers
4k views

How to use a capacitive touch screen without a human hand

I'm a programmer, and I usually hang out over on stack overflow, but I have a electricity question. I'm trying to interact with an APP on my phone by indirectly touching the the screen. Modern ...
1
vote
1answer
132 views

Replacement IC for the touch-button QT1081?

A project I'm working on needs several touch buttons. I found the datasheet for the Atmel QT1081, which supports up to 8 capacitive buttons, with the added advantage for our circuit that there are ...
1
vote
1answer
133 views

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 ...
2
votes
1answer
277 views

How to drive and control capacitive load?

There is electrochromic film (which is some kind of capacitive load) that need to be driven with 50Hz alternating current, load voltage should be controlled in range 0-100V (with 8 or more fixed ...
8
votes
1answer
1k views

Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?

Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave? My parameters: Frequency band of interest: 20KHz to 100 KHz, sine wave ...
4
votes
1answer
249 views

Capacitive touchscreen

I am doing project in which I want to perform read and write operation by using a capacitive touchscreen. What I know is I can trigger capacitive touch screen by: By using electromagnet as I heard ...
2
votes
2answers
551 views

Is there a 10X probe compensator BNC, but with out the probe?

Is there such thing as a compensation BNC like the ones found on 10X probes? I'm basically taking about a BNC coupler with a resistor and a adjustable cap in it. I guess it would be like a standard ...
2
votes
0answers
241 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 ...
2
votes
1answer
222 views

Smallest touch that can be detected on smartphone touchscreens

Not sure if this is the right place to ask this question, but what is the smallest touch (in terms of height and width) that can be detected on most smartphone screens (capacitive touchscreens found ...
3
votes
3answers
553 views

Is FR4 waterproof? What about soldermask?

I'm investigating ways of making a capacitive sensor that will operate in very moist environments, potentially even submerged. What I need is a way to make some conductive plates in a specific ...
2
votes
4answers
2k views

Conducting plastic for capacitive touchscreens

As I am disabled I have to use a headstick (see picture below) to do stuff on the computer. I also have a phone with a resistive touchscreen, which works well with my headstick. But here is the ...
4
votes
2answers
966 views

Triggering a capacitive sensor electronically?

I'm working on a little project I call my "Green Box". Basically, I'm trying to drop my electric usage as low as possible, without losing the convenience of my gadgetry. So far, I'm incorporating a ...
1
vote
3answers
1k views

PCB Matrix Touchpad?

Is it possible to DIY your own capacitative touchpad on a PCB? The last page of this mentions it: ...
4
votes
5answers
2k views

Can a water drop do a “fake” touch on a capacitive touchscreen?

If a capacitive touchscreen is hit by water drops, like rain, will it report a touch? I'm trying to evaluate what is the most appropriate touchscreen solution to use in an outdoor kiosk.
15
votes
8answers
11k views

Capacitive Touchscreen for DIY usage?

Anyone know of a good source for capacitive touchscreens in low quantity at a reasonable price? Just something to play around with in projects, I'm interested in either small (eg for portable ...
10
votes
6answers
1k views

Capacitive Sensing

Is there a way that I can make an Arduino or other Micro-controller detect a change in capacitance? I'm thinking of having a screen on my door that only turns on when you touch the metal door handle. ...