On 7/20/22 07:02, andy pugh wrote:
https://www.onsemi.com/products/interfaces/high-performance-optocouplers/specific-function-optocouplers/hcpl3700
It has a built-in bridge rectifier so can detect AC and DC up to 240V.
I found it while looking for things for a home automation project.
So that is where Fairchild went. I must have missed the memo.
And that is an elderly Fairchild offering. They had a microprocessor
called the F8 that was the heart of an automatic station break machine
that KRCR-TV in Redding CA had when I was acting CE in '79-81. But
I was then building a Quest Super Elf gizmo, to make commercial
tapes ready for it, learning how to program an RCA 1802 processor
without an assembler, just a hex monitor. Very early days of
micro-processors, 4k of static ram for it was $400 for a kit that
plugged into an S-100 buss. So I never had to putz with the F8,
it Just Worked.
Both are trivia game factoids today, but I was actually there,
doing things that no one else was doing. I still have a printout
of that program I made on a typewriter, and an audio cart
with several copies of it on a shelf high above this chair,
Fun times. :o)>
Looks like it could do most isolation duties but its propagation time
would muck up a faster pwm signal. Board real estate would suffer
as its 8 pins per channel. But it looks like its pricing is in 1k lots at
about $2500 for 1k pieces, somebody like Mouser or DigiKey will
likely want $4 or more a copy in onesies or twosies.
Interesting concept for mixed logic uses though. Interfacing with
24 volt relay logic in 40+ yo controllers comes to mind.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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