Re: scavenging opto-isolators

On 26 Nov 2007 09:47:03 -0500, Allan Adler
<ara@xxxxxxxxxxxxxxxxxxxx> wrote:

Suppose I want to scavenge opto-isolators (such as the 6N138 or 6N139)
from discarded electronic devices. What kinds of consumer electronics
should I fish out of the garbage?

- Telephony attachments, like modems and answering machines.
- Anything that uses some kind of door or slide that opens and is
'electronic'. (E.g. a CDROM player may use it to detect it's door
being open or closed, while a magnetron is likely to use a
mechanical switch for the same purpose)

But my 2 cents: scavenging optos is not such a good idea.
Don't expect more than 1 or 2 in any given device.
(Or find an isolated 128-input PC I/O card :-)

Keep in mind that the quality of optos rapidly declines (transfer
ratio falls) when they get hot, as in desoldering.

--
Kind regards,
Gerard Bok
.

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