Re: [neonixie-l] Digest for neonixie-l@googlegroups.com - 4 Messages in 1 Topic

[westdave]

just a thought about opto isolaton the old days you could find black soda straws with a lamp on one end and some kind of sensor * at the other end * a pin diode * a phototransistor* or a cds resistor (light active resistor) they also would use this type of a rig on old wah wah pedels and volume pedels( no noise,like with a pot)maybe a design using resistance? i can not make the jump to how many hours something can hold off 2000 volts,would it depend on the diodes?

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From: neonixie-l <neoni...@googlegroups.com>
To: Digest Recipients <neoni...@googlegroups.com>
Sent: Sat, Nov 30, 2013 11:50 pm
Subject: [neonixie-l] Digest for neoni...@googlegroups.com - 4 Messages in 1 Topic

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• Slightly OT - 2kV voltage isolation? [4 Updates]

 Slightly OT - 2kV voltage isolation?

Grahame Marsh <graham...@googlemail.com> Nov 30 06:13PM  

I'm looking to pass a, i2c bidirectional data signal between two systems
that have about 2kV voltage difference between their respective
"grounds". I can find several device on, say, Mouser's website but I'm
getting lost with all the insulation terms. There is a variety of test
voltage conditions like "Vrms for 1 minute" and "galvantic isolation in
kV". These voltages are typically 4 - 6kV. But I also find "Maximum
working insulation VIORM 566 voltage" - so does this mean a normal
working voltage difference? And so well less than 2kV.
 
Sorry, but I need an idiot's (that's me) guide to what isolation voltage
I should be looking for to isolate these systems that live 2kV apart? I
know there are solutions that use multiple optoisolators and drivers but
I was looking for a single chip solution. Any helpers please?
 
(The application is between a microcontroller and the cathode circuit of
a CRT so it is almost on topic.)
 
Grahame