Allowing for the flow of power or information without shared electrical nodes

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2
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2answers
678 views

How to isolate low voltage control circuit from high voltage power circuit?

Can anyone give me a brief run-down of some methods I could use for this? I want to drive a MOSFET or BJT with a 12v 555 circuit or oscillator. The MOSFET will drive a high voltage circuit that ...
2
votes
1answer
116 views

How do I pick an inductor(s?) for an LC filter on a power rail?

I'm using a TI SN6501 transformer driver to provide an isolated power supply for a project I'm working on. However, it is imperative that the output power rail be as clean and noiseless as possible, ...
0
votes
1answer
22 views

Power Metal Oxide Resistor - Maximum pulse voltage

I am looking for a suitable series resistor (220k) for a 230VAC optocoupler input. The device must meet requirements from EN60664-1. I am still trying to understand the final requirements, but from ...
0
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1answer
31 views

Pulse Supply Ground Reference

I am currently working on a high voltage supply for short (50-100ns), quick (<30ns rise time) pulses. The below circuit is my first rough draft for the power supply, I realized that by connecting ...
-1
votes
1answer
75 views

floating ground for AC and DC power supplies

I wanted to connect two power supplies, one is AC (240V , 6A) and the other is DC (3,3V, 300mA). But i read in some referrence that connecting AC and DC power supplies could be dangerous if the two ...
2
votes
0answers
98 views

What are the differences between Channel-to-Ground & Channel-to-Channel isolation?

I have the following questions regarding different types of isolation techniques: What are the major differences between Channel-to-Ground & Channel-to-Channel isolation techniques? Are all ...
2
votes
0answers
138 views

Isolation between cells for battery charging & testing

I want to charge Lipo battery packs and possibly other chemistries too. Six cell packs for starters. But hope to handle more and less. Perhaps a lot more cells. For electric vehicles, skateboards, ...
1
vote
0answers
616 views

Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
0
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0answers
71 views

SPI Communication fails with ISO7241C but works with ISO7641FC, same circuit?

Objective: To interface DAC161S997, with Microcontroller C8051F350 through ISO7641FC using SPI Protocol, Which works fine and DAC output is achievable. Now here is the problem, I have changed ...
0
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0answers
39 views

Recommendation for Overvoltage Protection

I am now trying to design an adapter between an inverter and a simulator. I actually need to do some protection for the very expensive simulator on the design. I did my job for digital signals with ...
0
votes
0answers
46 views

What parameters are key in selecting a transformer to pass digital data?

Looking to fiddle around with some digital signaling through transformers. Never done, so this is just to experiment and see what it looks like. For the purpose of digital isolation, what types of ...
0
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0answers
24 views

Unregulated Forward Converter for Galvanic Isolation

It seems to me that I could use an unregulated forward converter to provide galvanic isolation and then use a DC-DC converter to provide the voltage regulation. I'd use a two switch forward converter ...
0
votes
0answers
95 views

DIY HV Tube Isolation Transformer

I am making a bench top tube power supply from salvaged transformers. I want to make it as safe as possible so I am checking here before the build. The two 120V/20V transformers have electrostatic ...
0
votes
0answers
58 views

Full Speed USB Isolator

Can anyone suggest a way to galvanicaly isolate a USB Full Speed (12Mb/s) signal with a solution height of less than 2mm? Parts like the ADUM3160 (link) and ADUM4160 exist but they are too tall for my ...
0
votes
0answers
136 views

Isolating Probe from stray voltage

I have a PH Probe taking readings from an ungrounded container that has sources of electrical noise (AC Pumps, AC heaters, etc). I would like to protect the probe from that noise. If the ...
0
votes
0answers
667 views

RS232 Ground-Loop Isolation: “creative” solution?

I have a RS232 connection that seem to suffer from different ground potentials at the two ends of the connection: The receiver signals a "break condition" in Realterm. As I understand it this means ...
0
votes
0answers
397 views

Is this buffer for protecting 3.3v logic from 9v power sane?

I'm playing with the idea of making a multi-interface for classic game controllers. The interface connector between the system and the controller has several pins that can be used bidirectionally ...