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nicksydney >
wpwrak: yup.....seen them before it's old :)
00:57
<
nicksydney >
but i like their form factor ...tiny weeny ;)
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12:20
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whitequark >
lol wtf. somehow I have a few leds on the slave side of this optocoupler, and they light up, despite there being no power source except the LPT port at the master side
12:21
<
whitequark >
GNDIO/VCCIO are connected to an isolating DC-DC converter connected to the slave side power supply
12:22
<
whitequark >
and no, no capacitors are involved
12:23
<
whitequark >
can it be that uh... the photoelectric effect generates about 5mA of current inside an optocoupler?
12:24
<
whitequark >
that sounds slightly absurd
12:25
<
whitequark >
also the spurious voltage is 1.8V whereas the band gap in silicon is 1.2V so it's probably not that
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14:38
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wpwrak >
jut smake sure JP1.2 is high enough :)
14:39
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wpwrak >
if your bird did things correctly, ground floats, right ? :)
14:41
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whitequark >
that's not my PCB, that's the vendor-provided one
14:41
<
whitequark >
traced
14:42
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wpwrak >
so ground floats
14:43
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wpwrak >
well, or at least you don'thavegalvanic separation
14:43
<
whitequark >
I think it should float, yes
14:43
<
whitequark >
it should be galvanically separated
14:43
<
whitequark >
I mean, otherwise, what is the point of having the optocouplers there?
14:43
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wpwrak >
cargo cult ? :)
16:54
<
roh >
whitequark: optocouplers combined with schmitt-triggers are used for spike surpression and overvoltage protection in cnc/automatisation devices
16:55
<
roh >
so they are not only galvanic separation ;)
17:22
<
whitequark >
hmm, makes sense
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<
whitequark >
fun effect
18:22
<
larsc >
if you pump enough energy into it almost everything will become a light source ;)
18:22
<
whitequark >
well, here, it's a semiconductor effect
18:22
<
whitequark >
despite how it looks
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