Questions tagged [isolation]
Allowing for the flow of power or information without shared electrical nodes
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How to isolate RS485 (A and B) from existing transceiver? Check attached circuit diagram, is it correct?
I have a controller with an RS485 transceiver, specifically the IS8489EIBZ-T, which is not isolated. I want to connect a BMS system to the output of this transceiver. After some research, I found a ...
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Isolation transformer triggers the RCD in the lab [closed]
I am an electrical engineer, and I work in a lab environment. For some inverter measurements, we have bought an isolation transformer, but it triggers the RCD (GFCI for North America) in the lab when ...
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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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DC isolation - 3 separate circuits with same power source and shared I2C
I am trying to build one small project and based on the needs I need to isolate few components but also keep them connected using I2C. I was doing a research and found few DC DC isolator converters ...
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Designing Optocoupler circuit
I'm trying to learn how to design an optocoupler using 6N137.
datasheet : https://www.vishay.com/docs/84732/6n137_vo2601_vo2611.pdf
There is no CTR (current transfer ratio) value or graph in the 6N137 ...
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How to isolate nickel-chrome wire?
I want to heat up a stainless-steel pipe using a nickel-chrome wire by wrapping the wire around it and using a 12 V / 2 A DC adapter as a power source. I wrapped kapton around the pipe and also ...
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ESD on two different materials
I am conducting ESD testing on two types of materials with a setup that closely follows the 61000-4-2 standard. We have incorporated both isolation material and a ground plane into our setup.
When I ...
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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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RS232 isolated communication via MAX3250
I have a two diffrent boards. One of the board is send the SoC and other things to Charger Board. While charging progress starts I want to isolate this to device because battery ground is isolated to ...
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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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Power Supply is arced and fuses opened
Note: PFC circuit is bypassed
I have my own designed circuit and this circuit is get input of 220VAC/50Hz. Inside of circuit bridge rectifier and filters are exist with this circuit we get 320VDC. So ...
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Should I merge GND and COM?
I'm building an dual supply op-amp circuit. I'm using a Isolated DC-DC converter module to supply op-amp with +-15V. The module ouput is labeled 'COM' and isolated from the input GND. The input signal ...
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Choosing Y-capacitor value for isolated DC-DC
In an isolated DC-DC converter datasheet (link), the Y-capacitor recommended is 270 pF. How is this value arrived at? And would the intended use of the Y-cap be achieved if a higher value like 1nF is ...
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Will an isolation transformer have a noticeable effect on mains hum? Also critique my DIY transformer idea
(Uber-edit - it has come to my attention that I am an ignoramus. This post is being left in place not to highlight my stupidity in particular, but to serve as a warning for others who think ...
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