Questions tagged [capactive]
5 questions
6
votes
2 answers
Reducing volume for a split-phase 230VAC@60Hz sealed power supply providing 5VDC@50mA
I'm a hobbyist interested in re-designing and implementing a DC power supply providing a \$+5V_{DC}\pm 200mV\$ output with a current compliance of \$50mA\$ (I could live with \$30mA\$ successfully) from a \$230V_{AC}\$ @ 60Hz split-phase US mains…
jonk
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3
votes
3 answers
Can an electric heat mat cause fake touches on a capacitive screen?
After installing one of these heated desk mats on my cold work desk, I've noticed some erratic behavior on touchscreen devices I develop software for when they're laid down on the mat. Most noticeable on iphones, when the heat is on, part of the…
Josh Hibschman
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1
vote
1 answer
How to detect impending user touch before it happens?
I would like to detect an impending human touch on my microcontroller (I use an ESP32) - before it happens and setoff some kind of beeper (nasty humans, yees... touching electronics when you know you shouldn't). TL;TR: How can I reliably detect the…
user2305193
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0
votes
0 answers
Active inrush current limiter using relay
I'm concerned about the delay of a typical relay used in this circuit:
DC: voltage from a low quality switching regulator.
R : high wattage current limiting resistor.
Cap : group of parallel capacitors. Summing to 8.6 mF
UVLO : Enables the DC-DC…
Elementronics
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0
votes
2 answers
Comparison of energy storage density of inductive and capacitive systems
In the paper A Review of Short Pulse Generator Technology by John Mankowski (IEEE Transactions on Plasma Science, Vol. 28, No. 1, 2000, pp 102-108) I found that "energy density of inductive storage systems is two orders of magnitude greater than…
space bobcat
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