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Capacitive touch screens don't work from the supposed "aura" that some folk believe emanates from humans - they'll work with dogs, cats, medium sized rodents, pieces of metal and probably wet wood. … Capacitance is not given by gods to humans but is firmly routed in the physics of objects and the "styli" or pen has to be held in the hand and therefore a significant capacitive connection to the body …

, how would I estimate the capacitive load of the setup? … You can fairly well assume that the capacitive load will be about 100 pF per metre of cable. This will be seen between the send wire and the screen or ground return. …

If you put a capacitor across an AC supply it might take (say) 1A. If you put a resistor across the same supply and the resistor also took 1 A there would be real power dissipated in the resistor and …

A static electric field has no ability to deliver any power or energy to something that might be used to measure its presence. Just like a capacitor carries no DC current when a constant DC voltage is …

This question and answer explains how the output of many two-pronged AC (earthless) SMPSs use a capacitor internally to reduce excessive output switching noise because of internal transformer capacitive …

The resonance value of 6 kHz in the data sheet is the mechanical resonance of the sensing element in the device. The cut-off frequency in the data sheet is that of the filter that processes the signal …

If C1 was directly connected across L and N and takes a current of 80mA when the input voltage is 220V AC, then that is the limit of this circuit. Using a "transformer" is the only way you can increas …

A Capacitive Load, depending of the length of the cable? …

So, is there an analog circuit which can achieve this without any microcontroller? A Theremin springs to mind: - Not just outdated since black and white days but still made: - Basic Theremin kit i …

I am wondering if it would be possible to create a capacitive switching sensor to distinguish between plastic and metal given the wheel is rotating around 3500 rpm That's about 58 revs per second and … I've designed and built capacitive probes and sensor circuits that are good for a bandwidth of nearly 100 kHz so it's certainly possible with the sort of resolution as seen by the TI chips set above. …

How to make sure that my compensated attenuator would work for certain pulse widths? The thing about connecting your compensated attenuator to an op-amp is that should take into account the input ca …

That ghost voltage is caused by the switch mode power supply's internal EMI reduction capacitors AND it is likely that the SMPS you have used either doesn't require an earth connection for safety or E …

Nice project. Any conductor, even relatively weak ones, will do because the capacitance will be in series with either <1 ohm or 100 ohms+ and the resistance won't make a deal of difference. Water temp …

Basically you have (a) calculated the kVA loading correctly when the power factor is 0.65. In simple terms it's 55 kW ÷ 0.65 = 84.615 kVA. You have also (b) calculated the current correctly i.e. 84.61 …

Is it possible to buffer a sinewave using inverters alone or with some kind of feedback? Two things are needed: - The inverter needs to be an unbuffered type A high value resistor (typically 100 kΩ …