Electronics > Projects, Designs, and Technical Stuff
Optically transparent electrical isolation of analog signal
ahbushnell:
--- Quote from: NiHaoMike on June 10, 2020, 01:23:45 am ---
--- Quote from: ricko_uk on June 09, 2020, 02:03:31 pm ---1) I was wondering if there are optically-transparent RF-shielding materials and then use some optocoupling means?
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Metal mesh is just that - commonly available as window screen.
--- Quote ---2) maybe there are already ready-made module solutions?
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Cheap S/PDIF ADCs and DACs are a cheap way to convert to and from fiber. Keep in mind you'll want the ones that can do 96kHz sample rate or more in order to be able to pass 30kHz.
Then there are feedthrough filters that pass low frequency signals through without compromising the RF isolation.
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It's like window screen but you want a good conductor that you can solder too. So brass screen would be good.
mikeselectricstuff:
Re. Spdif adc/dacs, bear in mind these are not specced for dc, so offset and drift performance,maybe also gain stability may not be good
ricko_uk:
Thank you all, :)
--- Quote from: ejeffrey on June 10, 2020, 02:24:05 am ---A tube is much better. A waveguide below cutoff does not support travelling waves but does support evanescencent waves. These die off exponentially with distance but if the tube is too short you can still get some signal through.
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How do I decide/calculate the minimum length of such tube?
Thank you
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