Recent content by svenkesd

It is hard to say why that would happen, so many factors come into play that it is hard to guess without experimentation. One possibility: There are different thresholds that capacitive sensing software will watch for when detecting objects, first a threshold to tell the device that an...

In a sensing device like the screen the electric field is generated by the device, no external electric field is necessary to be introduced to make the screen work. There are various methods to do this that have different advantages for noise immunity, sensitivity, etc. I'll start from the...

Any capacitive touch screen, such as the iphone, will register a touch based on the dielectric of the material in contact and the amount of that material. Think of it as literally inserting a material between two plates of a capacitor, a low dielectric material won't have much effect on the...

Technically that should work, you will get very uneven current distribution without a feedback mechanism, but it will light the LEDs. The problem with what you are suggesting is that for the blue LED you are working with the steep part of the I-V curve of the diode. What that means is a tiny...

If you are looking for suggestions for a power source I would suggest a 12V source with 10 parallel strings of 5 LEDs. Give each string its own current limiting device. Just figure out how much current you want to run through the LEDs to determine the best way to current limit.

A few things to consider here. You should be able to power a red LED from 3V but maybe not a blue LED. It depends on the LED and the battery charge. Usually AA batteries start with a charge of about 1.6V per battery so you might be able to run a 3Vf LED from 2 of these for a limited time...