Questions tagged [safety]
*Your* health and safety while working on electrical devices, and designing devices that will not shock, set fire to, or otherwise harm the user of the device.
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Shelly 0-10 with östberg ø125 c1 EC fan [closed]
Can one use a shelly to regulate det voltage of an EC fan of this size?
Östberg has advertised the use of a plejd dimmer for this, but I want to use shelly if it is safe. I don't know enough about ...
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Safety in industrial embedded system
I have just started working at a startup that specialises in imaging equipment in an industrial environment (based in Europe). I have just started a body of work looking to improve the safety ...
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Are inductors in resonant circuits dangerous? They produce very high voltages
A simple series LC resonant circuit has theoretically infinite voltage in the middle between L and C, if we assume 0 ESR and exact resonant frequency:
\$V_{at LC junc} = V_{in} \frac{X_{C1}}{X_{C1}-...
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Safety considerations for designing Mains Voltage Sensing Circuit
I'm looking to design a circuit to measure AC mains voltage and current for protection purposes. I'm considering using the ADS131E0 ADC by Texas. The IC is made with power-line monitoring in mind.
On ...
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How can a Class E Power Amplifier be built and experimented with safely?
Given that Class E RF amplifiers, even those that generate less than a few watts, can easily generate voltage spikes approaching (or exceeding) 100 V, how can they be homebrew built and experimented ...
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Does it improve safety to make a capacitative dropper symmetric?
Here's the most basic capacitative dropper circuit I could find with ten seconds on Google. Allegedly the voltage across the load will be about 5V. (I say "allegedly" because I couldn't ...
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Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source?
Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source?
Looking at the circuit below, I can generate this from a 9V battery. Is this safe? It's on a ...
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Feasibility of Using Xinya XY2500 4-Pin Pluggable Terminal for Three-Phase PCB
I am designing a PCB for a three-phase system and considering using the Xinya XY2500 4-pin pluggable terminal connector (pitch 5.08 mm, rated 15A @ 300V) to connect R (Phase 1), Y (Phase 2), B (Phase ...
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Safety considerations when measuring an analog signal across an isolation barrier
I'm designing a PCB that is powered by 230V AC and switches 5 heating elements via 5 Triacs. As a best practice I included optotriacs for driving the main triacs and used a 230V to 5V buck converter ...
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Can 3 power supplies safely share common ground?
I have a project with a DC motor @ 24V, an actuator @ 12V and an Arduino @ 5V. The motor and the actuator may draw several amps. The Arduino doesn't drive the motor nor the actuator, nor is it ...
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My isolation transformer has its protective earth connected to the output neutral. How should I rewire it for my home lab for "DUT probing"?
I have a rather sturdy isolation transformer in my home lab and I just realized that the primary side earth is not only connected to the output side earth but also to the output side neutral. I don't ...
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Understanding safety concerns with RGB modding hot-chassis TV
I'm in the US. I'd like clarifications on the safety of RGB modding an old, hot-chassis TV. I know it's not economically viable but I'd like to learn. While researching how to do this safely I ...
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Did Micro-USB have protection against "loops"?
I have an older USB power brick from a reputable, well-known company (i.e., not rock-bottom re-branded cheapest-as-possible). It has a female USB-A connector as output, and a female micro-USB ...
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Is EMT plenum rated? If I install EMT in a plenum and run general purpose wiring through it, does this violate NFPA 75?
I have a raised floor area with a few server racks on top, the under floor area is used to distribute HVAC to the racks. I have already run all the cables before learning of NFPA75's plenum rating ...
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Is there a standard which requires a high voltage warning label on a PCB?
If part of your PCB carries high voltages at certain nodes, is there a standard that requires some sort of silkscreen label or sticker to warn technicians when installing/uninstalling boards into ...
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