Actually it does. It does not generate any power and is dependent on some outside power before it's resistance change can do anything.
Photo diodes can produce current when subjected to light, LED's ditto.
Is this all news to you? are you just being obstreperous?
I saw one optocoupler datasheet that uses a series string of integrated photo diodes to produce the voltage necessary to bias a mosfet on... here it is:
Now, do you want to rethink the idea that they need power?
Along with a lot of other stuff, they've been paying my bills since
1983ish. Friends don't come a lot more faithful than that. ;)Cheers
Phil Hobbs
Would everyone please quit top-posting?
I think you mean "antiparallel" or "inverse parallel". "Back-to-back" means inverse series, as in "back-to-back zeners".
Cheers
Phil Hobbs
Really? A lot of renewable energy is supplied by big photodiodes (aka solar cells). All an unpowered LDR does is sit there.
Cheers
Phil Hobbs
OK
Point taken. How's about 69?
Nah, that's too exciting a hobby. Electronics you can do for hours and hours. ;)
Cheers
Phil Hobbs
es.
he
are in
mp.
dS
fIt's terrible PC-wise to say, but it's important to be biased when it comes to photodiodes. :^)
George H.
You only say that because you're a man. ;)
Cheers
Phil Hobbs
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