On 13-12-02 04:40 PM, Tom Harris wrote:
Use SPI protocol, then you only need 3 optos with simple drivers, no
bidirectional stuff. For isolation, use cheap jacketed polymer fibre
optic, about $1 a metre, with matching detectors & transmitters $2 each
or so.
But how do you determine the "safe" working voltage for that?
Which brings up my other question from this discussion, what are the
failure mechanisms that would cause the Optocoupler to hold of 2 Kv for
a minute, but fail after an unspecified number of hours?
Is this dirt accumulation caused by the fields?, is it breakdown of the
plastics? is it too many electrons sitting for too long that they
finally make a run for it? Is it arcing?
--
Charles MacDonald Stittsville Ontario
[email protected] Just Beyond the Fringe
http://Charles.MacDonald.org/tubes
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