Finally, instead of building the tube assembly that I originally described, you could simply select this integrated 40kV-rated ceramic tube construct (which has a superb 10 MHz signal bandwidth):
http://www.micropac.com/images/DataSheet/66147.pdf They're a bit pricey at 22 bucks each, but at least you would have the peace of mind of knowing that they would never fail. Cheers, -ub On Sun, Dec 1, 2013 at 10:03 PM, Ulysses Balis <[email protected]> wrote: > Alternatively, for a simpler approach, take a look at this 12 kV single > component isolation solution: > > http://www.micropac.com/images/HVOC/66353%20Datasheet.pdf > > It's even space-qualified. > > > On Sun, Dec 1, 2013 at 9:49 PM, Ulysses Balis <[email protected]> wrote: > >> Why not just make your own optocoupler? Fill a lexan or acrylic 10 cm >> tube with clear, slow-setting epoxy and then affix an IR led on one and a >> darlington phototransistor on the other end, with these two components >> serving as end plugs for the epoxy. Then paint the unit black with a >> low-voc paint. The resultant construct will offer over 100KV of permanent >> breakdown voltage immunity. You'll need to make several of these for I2C >> functionality. Alternatively, consider a micro power wireless local area >> network, with an rf link serving as the data channel. Place two >> bi-directional I2C transponders in a Faraday-shielded container, with 1 cm >> ceramic mounting posts for each transceiver board, along with HV glass >> passivated feed-throughs to make a permanently isolated HV hardened / >> isolated construct. Optionally, fill the whole cavity with Sylgard 184 >> (and let cure for 4 hours at 60C) when assembled for the ultimate in >> dielectric breakdown immunity. >> >> -ub >> >> >> On Sun, Dec 1, 2013 at 3:48 AM, Grahame Marsh < >> [email protected]> wrote: >> >>> On 01/12/2013 01:22, David Forbes wrote: >>> >>>> On 11/30/13 11:13 AM, Grahame Marsh wrote: >>>> >>>>> >>>>> I'm looking to pass a, i2c bidirectional data signal between two >>>>> systems >>>>> that have about 2kV voltage difference between their respective ... >>>>> >>>>> >>>> Grahame, >>>> >>>> A quick Google search turned up this HP (Agavo) app note. It may or may >>>> not help. There are amusing graphs of volts vs hours of lifetime. 2KV is >>>> usually at 10 hours. >>>> >>>> http://www.avagotech.com/docs/5989-0802EN >>>> >>>> >>> David >>> >>> Thank you for the paper it has helped a lot - if I have read it >>> correctly, the best performance is a catagory 3 opto coupler can stand off >>> 1kVDC for > 100 000 hrs. So it looks like my search for a part ends 'cause >>> there is no such part... back to the drawing board. >>> >>> Cheers Grahame >>> >>> >>> >>> >>> >>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "neonixie-l" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send an email to [email protected]. >>> To view this discussion on the web, visit https://groups.google.com/d/ >>> msgid/neonixie-l/529AF7FA.5000100%40googlemail.com. >>> >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >> >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CANX%2BaJhOVGiDYNR75-oOsuoug8Zvh0xSb1gnCj6%2BU0_MyO3z_g%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
