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Jim Thompson wrote:
On Thu, 22 Oct 2009 00:56:10 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
Joerg wrote:
Jim Thompson wrote:
Is there a dual optocoupler, LED => Photodiode ??
                                       ...Jim Thompson
Used to be--the late lamented TIL300, which was discontinued a
year or so ago. (http://focus.ti.com/lit/ds/symlink/til300.pdf)
Nowadays you\'re better off using PWM--it\'s way more predictable.
Cheers
Phil Hobbs
I don\'t have control of the source side... I need isolation, no more
than 10uA IQ.
No sure what you want to do here but there are plenty of LED -> dual
photodiode versions for doing the feedback thing, like this one:
http://www.avagotech.com/docs/AV02-0886EN
Thanks, Joerg--I didn\'t know about those ones. TI has got completely
out of the opto business, it looks like, and sometimes a linear
photocoupler is just the right medicine.
Cheers
Phil Hobbs
That might be just the ticket, since I tried this already...
http://analog-innovations.com/SED/CurrentPolaritySense.pdf
Pretty puny performance, even when praying that the 4N25 model is
adequate ;-)
Phil, Your \"PUT\" idea is intriguing, though I\'d need two for
_polarity_, unless you have another clever idea ;-)
                                       ...Jim Thompson
Of course you\'d need an isolated power supply to be able to apply
feedback to the optocoupler...those aren\'t the same as a dual matched
opto, where you can invert the transfer curve on the LV side using an op
amp.
I\'d be inclined to put the PUT device inside a bridge rectifier made
from two optos and two diodes, so you can get the polarity and the
current as well. (That\'s a variant of Pease\'s trick with the voltage
reference inside the bridge rectifier.)Â If you\'re brave you can save
one photocoupler, but I\'d prefer to subtract the two photocurrents on
the left side to get a more reliable polarity indication.
 I_IN
 |
 *--------------------------------------------------*
 |                                                 |           /
 ---                                               --- LED   |/
 / \\                                               \\ / -->    | photo
 ---                                               --- -->    |v
 |                                                 |           \\
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 | (Subtract to
 |           *-------------------------------------* get polarity)
 |           |                                    |
 |           |                                    |
 |           |                 Rprog             |
 |           *----------* *------RRRR--Vprog      |           /
 |           |         |/                       --- LED   |/
 |           |        --- 2N6028               / \\ -->    | photo
 |          ---       \\ / PUT                  --- -->    |v
 |          ---       ---                        |           \\
 |           |         |                         |
 |           |         R                         |
 |           |         R                         |
 |           |         R                         |
 |           |         |                         |
 |           |         |           /            |
 |           |        --- LED   |/             |
 |           |        \\ / -->    | photo       |
 |           |        --- -->    |v             |
 |           |         |           \\            |
 |           |         |                         |
 *------------*----------*   (Magnitude)          |
 |                                                 |
 |                                                 |
 ---                                                |
 \\ /                                                |b
 ---                                                |
 |                                                 |
 |                                                 |
 |                                                 |
 *--------------------------------------------------*
 |
 |
 COM
Cheers
Phil Hobbs
Phil Hobbs wrote:
Jim Thompson wrote:
On Thu, 22 Oct 2009 00:56:10 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
Joerg wrote:
Jim Thompson wrote:
Is there a dual optocoupler, LED => Photodiode ??
...Jim Thompson
Used to be--the late lamented TIL300, which was discontinued a
year or so ago. (http://focus.ti.com/lit/ds/symlink/til300.pdf)
Nowadays you\'re better off using PWM--it\'s way more predictable.
Cheers
Phil Hobbs
I don\'t have control of the source side... I need isolation, no more
than 10uA IQ.
No sure what you want to do here but there are plenty of LED -> dual
photodiode versions for doing the feedback thing, like this one:
http://www.avagotech.com/docs/AV02-0886EN
Thanks, Joerg--I didn\'t know about those ones. TI has got completely
out of the opto business, it looks like, and sometimes a linear
photocoupler is just the right medicine.
Cheers
Phil Hobbs
That might be just the ticket, since I tried this already...
http://analog-innovations.com/SED/CurrentPolaritySense.pdf
Pretty puny performance, even when praying that the 4N25 model is
adequate ;-)
Phil, Your \"PUT\" idea is intriguing, though I\'d need two for
_polarity_, unless you have another clever idea ;-)
...Jim Thompson
Of course you\'d need an isolated power supply to be able to apply
feedback to the optocoupler...those aren\'t the same as a dual matched
opto, where you can invert the transfer curve on the LV side using an op
amp.
I\'d be inclined to put the PUT device inside a bridge rectifier made
from two optos and two diodes, so you can get the polarity and the
current as well. (That\'s a variant of Pease\'s trick with the voltage
reference inside the bridge rectifier.) If you\'re brave you can save
one photocoupler, but I\'d prefer to subtract the two photocurrents on
the left side to get a more reliable polarity indication.
I_IN
|
*--------------------------------------------------*
| | /
--- --- LED |/
/ \\ \\ / --> | photo
--- --- --> |v
| | \\
| |
| |
| |
| | (Subtract to
| *-------------------------------------* get polarity)
| | |
| | |
| | Rprog |
| *----------* *------RRRR--Vprog | /
| | |/ --- LED |/
| | --- 2N6028 / \\ --> | photo
| --- \\ / PUT --- --> |v
| --- --- | \\
| | | |
| | R |
| | R |
| | R |
| | | |
| | | / |
| | --- LED |/ |
| | \\ / --> | photo |
| | --- --> |v |
| | | \\ |
| | | |
*------------*----------* (Magnitude) |
| |
| |
--- |
\\ / |b
--- |
| |
| |
| |
*--------------------------------------------------*
|
|
COM
Cheers
Phil Hobbs
Speaking of opto oldies....
https://www.dropbox.com/s/fi853yupv90sih6/FetDriver.jpg?raw=1
https://www.dropbox.com/s/t7v9rrx1gbcqq7a/Faster_Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/qcmlv976j3pm0xi/HV_Reg_4.jpg?raw=1
https://www.dropbox.com/s/pbdcg3fgrc0xyfi/HVamp.JPG?raw=1
https://www.dropbox.com/s/w335mxxj7s5fqex/Opto_HV_Regs.JPG?raw=1
https://www.dropbox.com/s/cr5pdtk0s9gilee/Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/g9878oxoukpo2v7/ZCD.JPG?raw=1
https://www.dropbox.com/s/pwi91ext9cclhzz/Gate_Driver_3.JPG?raw=1
https://www.dropbox.com/s/actvno4nzpsr482/HV_Dep_Cascode.JPG?raw=1
On Mon, 28 Feb 2022 15:13:36 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:
Speaking of opto oldies....
https://www.dropbox.com/s/fi853yupv90sih6/FetDriver.jpg?raw=1
https://www.dropbox.com/s/t7v9rrx1gbcqq7a/Faster_Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/qcmlv976j3pm0xi/HV_Reg_4.jpg?raw=1
https://www.dropbox.com/s/pbdcg3fgrc0xyfi/HVamp.JPG?raw=1
https://www.dropbox.com/s/w335mxxj7s5fqex/Opto_HV_Regs.JPG?raw=1
https://www.dropbox.com/s/cr5pdtk0s9gilee/Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/g9878oxoukpo2v7/ZCD.JPG?raw=1
https://www.dropbox.com/s/pwi91ext9cclhzz/Gate_Driver_3.JPG?raw=1
https://www.dropbox.com/s/actvno4nzpsr482/HV_Dep_Cascode.JPG?raw=1
Gosh. Nine opportunities for the cluckers and whiners to, well, cluck and whine.
Is the internet down or something?
On Mon, 28 Feb 2022 15:13:36 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:
Speaking of opto oldies....
https://www.dropbox.com/s/fi853yupv90sih6/FetDriver.jpg?raw=1
https://www.dropbox.com/s/t7v9rrx1gbcqq7a/Faster_Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/qcmlv976j3pm0xi/HV_Reg_4.jpg?raw=1
https://www.dropbox.com/s/pbdcg3fgrc0xyfi/HVamp.JPG?raw=1
https://www.dropbox.com/s/w335mxxj7s5fqex/Opto_HV_Regs.JPG?raw=1
https://www.dropbox.com/s/cr5pdtk0s9gilee/Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/g9878oxoukpo2v7/ZCD.JPG?raw=1
https://www.dropbox.com/s/pwi91ext9cclhzz/Gate_Driver_3.JPG?raw=1
https://www.dropbox.com/s/actvno4nzpsr482/HV_Dep_Cascode.JPG?raw=1
Gosh. Nine opportunities for the cluckers and whiners to, well, cluck
and whine.
Is the internet down or something?
John Larkin wrote:
On Mon, 28 Feb 2022 15:13:36 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:
Speaking of opto oldies....
https://www.dropbox.com/s/fi853yupv90sih6/FetDriver.jpg?raw=1
https://www.dropbox.com/s/t7v9rrx1gbcqq7a/Faster_Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/qcmlv976j3pm0xi/HV_Reg_4.jpg?raw=1
https://www.dropbox.com/s/pbdcg3fgrc0xyfi/HVamp.JPG?raw=1
https://www.dropbox.com/s/w335mxxj7s5fqex/Opto_HV_Regs.JPG?raw=1
https://www.dropbox.com/s/cr5pdtk0s9gilee/Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/g9878oxoukpo2v7/ZCD.JPG?raw=1
https://www.dropbox.com/s/pwi91ext9cclhzz/Gate_Driver_3.JPG?raw=1
https://www.dropbox.com/s/actvno4nzpsr482/HV_Dep_Cascode.JPG?raw=1
Gosh. Nine opportunities for the cluckers and whiners to, well, cluck
and whine.
Is the internet down or something?
Nah, they just aren\'t as cute as that floating-Murata-tile gate driver.
(I was mining some old SED stuff for possible inclusion in the new book,
and hit ctl-R instead of ctl-L.)
Cheers
Phil Hobbs
On Wed, 2 Mar 2022 11:27:28 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
John Larkin wrote:
On Mon, 28 Feb 2022 15:13:36 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:
Speaking of opto oldies....
https://www.dropbox.com/s/fi853yupv90sih6/FetDriver.jpg?raw=1
https://www.dropbox.com/s/t7v9rrx1gbcqq7a/Faster_Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/qcmlv976j3pm0xi/HV_Reg_4.jpg?raw=1
https://www.dropbox.com/s/pbdcg3fgrc0xyfi/HVamp.JPG?raw=1
https://www.dropbox.com/s/w335mxxj7s5fqex/Opto_HV_Regs.JPG?raw=1
https://www.dropbox.com/s/cr5pdtk0s9gilee/Opto_Totem.JPG?raw=1
https://www.dropbox.com/s/g9878oxoukpo2v7/ZCD.JPG?raw=1
https://www.dropbox.com/s/pwi91ext9cclhzz/Gate_Driver_3.JPG?raw=1
https://www.dropbox.com/s/actvno4nzpsr482/HV_Dep_Cascode.JPG?raw=1
Gosh. Nine opportunities for the cluckers and whiners to, well, cluck
and whine.
Is the internet down or something?
Nah, they just aren\'t as cute as that floating-Murata-tile gate driver.
GaN is amazing. Circuits that look obviously amateurish and stupid
just work!
(I was mining some old SED stuff for possible inclusion in the new book,
and hit ctl-R instead of ctl-L.)
Cheers
Phil Hobbs
I did seem like an oldie, but that\'s not bad.
At least it was on-topic!
Now that olduse.net has shut down--it was fun while it lasted--we should
maybe bring back an old thread occasionally. The Hills and Woodgates
and Schulze-Clewings and Wescotts and Willamses and AESes and even
Thompsons and Misos of yore had some good things to contribute. (We
don\'t have to rescuscitate the Eeyores and Roberts and Uncle Als.)
Cheers
Phil Hobbs
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we should
maybe bring back an old thread occasionally. The Hills and Woodgates
and Schulze-Clewings and Wescotts and Willamses and AESes and even
Thompsons and Misos of yore had some good things to contribute. (We
don\'t have to rescuscitate the Eeyores and Roberts and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
James ArthurOn Thursday, March 3, 2022 at 4:15:40 AM UTC, Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we should
maybe bring back an old thread occasionally. The Hills and Woodgates
and Schulze-Clewings and Wescotts and Willamses and AESes and even
Thompsons and Misos of yore had some good things to contribute. (We
don\'t have to rescuscitate the Eeyores and Roberts and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
indeed. I also gave credence to
John Fields
Rich Grise
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Which one?
Fields occasionally had good things to say, but the interminable
JT/JL/AWS flame wars were much, much worse when he got involved.
Cheers
Phil Hobbs
On Thu, 3 Mar 2022 08:42:27 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Which one?
Fields occasionally had good things to say, but the interminable
JT/JL/AWS flame wars were much, much worse when he got involved.
Cheers
Phil Hobbs
Most of my interaction with JT was technical. He liked to insult
people.
I suspect he drank himself to death. He talked about wine all the time
and got pancreatic cancer.
jlarkin@highlandsniptechnology.com wrote:
On Thu, 3 Mar 2022 08:42:27 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Which one?
Fields occasionally had good things to say, but the interminable
JT/JL/AWS flame wars were much, much worse when he got involved.
Cheers
Phil Hobbs
Most of my interaction with JT was technical. He liked to insult
people.
He did that--I don\'t remember your ever starting one of those fights.
But you are a bit of a lightning rod at times, you must admit.
On Thu, 3 Mar 2022 11:18:50 -0500, Phil Hobb <pcdhSpamM...@electrooptical.net> wrote:
jla...@highlandsniptechnology.com wrote:
On Thu, 3 Mar 2022 08:42:27 -0500, Phil Hobbs <pcdhSpamM...@electrooptical.net> wrote:
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Most of my interaction with JT was technical. He liked to insult
people.
He did that--I don\'t remember your ever starting one of those fights.
But you are a bit of a lightning rod at times, you must admit.
I have ideas, and a lot of people here are instantly hostile to unapproved ideas.
Compared to other regulars, Bozo contributes practically nothing except
insults to this group.
On Friday, March 4, 2022 at 3:32:44 AM UTC+11, jla...@highlandsniptechnology.com wrote:
On Thu, 3 Mar 2022 11:18:50 -0500, Phil Hobb <pcdhSpamM...@electrooptical.net> wrote:
jla...@highlandsniptechnology.com wrote:
On Thu, 3 Mar 2022 08:42:27 -0500, Phil Hobbs <pcdhSpamM...@electrooptical.net> wrote:
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
snip
Most of my interaction with JT was technical. He liked to insult
people.
He did that--I don\'t remember your ever starting one of those fights.
But you are a bit of a lightning rod at times, you must admit.
I have ideas, and a lot of people here are instantly hostile to unapproved ideas.
Actually they are hostile to bad and silly ideas, and that does cover most of the \"ideas\" you post here.
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Which one?
On 04/03/2022 00:42, Phil Hobbs wrote:
Chris Jones wrote:
On 03/03/2022 05:20, Phil Hobbs wrote:
Now that olduse.net has shut down--it was fun while it lasted--we
should maybe bring back an old thread occasionally. The Hills and
Woodgates and Schulze-Clewings and Wescotts and Willamses and AESes
and even Thompsons and Misos of yore had some good things to
contribute. (We don\'t have to rescuscitate the Eeyores and Roberts
and Uncle Als.)
Cheers
Phil Hobbs
I\'d add Genome / DNA to that list.
Which one?
This one:
https://web.archive.org/web/20070306191630/http://www.genomerics.org/
I hope he is ok.
I meant, \"which list?\"