exciting new part: the Optocoppler

[Jim Thompson]

On Mon, 17 May 2004 21:47:32 GMT, "Tom Del Rosso"
<tdnews01@att.net.invalid> wrote:

In news:c8b7le0m60@drn.newsguy.com,
Winfield Hill typed:
Spehro Pefhany wrote...

Peach-Apricot Coppler

Is that an improved form of classic Peach-Apricot Cobbler?

It's like an upside-down cake, but only in the middle.

A Peach-Apricot Copulator ?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Jan Panteltje]

On a sunny day (17 May 2004 09:08:30 -0700) it happened Winfield Hill
<Winfield_member@newsguy.com> wrote in <c8ao1u023a6@drn.newsguy.com>:

An exciting new kind of part, the LT series Optocopplers:

"Often these units are referenced to as Optocoplers, as they
function similar to standard copplers..."

http://optoelectronics.perkinelmer.com/catalog/Category.aspx?CategoryName=LT+Series

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)
In the 60ties, in the TV studio, in the old huge tube mixer, they used

bulbs and LDR to control audio...
Things such as drift, aging, mmm probelms..
Lets go digital.
LDR was slow btw.
JP

 

[Jan Panteltje]

On a sunny day (Mon, 17 May 2004 20:23:15 +0200) it happened Rene Tschaggelar
<none@none.net> wrote in <40a9034f$0$710$5402220f@news.sunrise.ch>:

Appart from the lacking english,

the difference is a resistor output, not unlike a CdS.
I think it IS a CdS.

JP

 

[John Larkin]

On Mon, 17 May 2004 22:53:04 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (17 May 2004 09:08:30 -0700) it happened Winfield Hill
Winfield_member@newsguy.com> wrote in <c8ao1u023a6@drn.newsguy.com>:

An exciting new kind of part, the LT series Optocopplers:

"Often these units are referenced to as Optocoplers, as they
function similar to standard copplers..."

http://optoelectronics.perkinelmer.com/catalog/Category.aspx?CategoryName=LT+Series

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)
In the 60ties, in the TV studio, in the old huge tube mixer, they used
bulbs and LDR to control audio...
Things such as drift, aging, mmm probelms..
Lets go digital.
LDR was slow btw.
JP

HP made a analog voltmeter ca 1964, the 425A, that went down to +-10
uv and +-10 pa full-scale on its zero-center, mirrored meter. It used
photoresistors as the chopper modulator and demodulator switches, with
a clock-motor driven optical chopper and an incandescent lamp to
switch the photojobbies. It was very cool. $500, which is more like
$5000 in today's money.

I think Fluke used photoconductor choppers in their later differential
voltmeters, too. The early ones used mechanical choppers.

John

 

[Rich Grise]

"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message

Peach-Apricot Coppler
...
To prepare whipped topping,

Isn't that whippled toppling?

Cheers!
Rich

(first, I was gonna try "whibbed tobbing," but that's dump.)

 

[Martin Riddle]

Its the German version of the Optocoupler.


"Winfield Hill" <Winfield_member@newsguy.com> wrote in message news:c8ao1u023a6@drn.newsguy.com...

An exciting new kind of part, the LT series Optocopplers:

"Often these units are referenced to as Optocoplers, as they
function similar to standard copplers..."

http://optoelectronics.perkinelmer.com/catalog/Category.aspx?CategoryName=LT+Series

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)

 

[Glenn Gundlach]

Tom MacIntyre <tom__macintyre@hotmail.com> wrote in message news:<9i9ia0p92u03dqb8b4r2nrkfk427s6aggs@4ax.com>...

On 17 May 2004 13:04:50 -0700, Winfield Hill
Winfield_member@newsguy.com> wrote:

snip
I see many misspellings on CNN, and I watch it infrequently. In their
defense, one of the many jobs I had in broadcasting years ago was
operating the character generator, and mistakes did happen. It's just
that I also see it more frequently now on CNN, and I was working in a
tiny market for Canada's public broadcaster, not for CNN.

Tom

At the CBS affiliate I worked at, engineering was TD (the guy at the
switcher-- 'technical director'). We would see the CG on preview and
often catch the errors before they aired. Gee, I hope I didn't
misspell anything.
GG

 

[Keith Wootten]

In message <ck9ia0tfvi1u1vvdc5c28hma0s49217clq@4ax.com>, John Larkin
<jjlarkin@highSNIPlandTHIStechPLEASEnology.com> writes

<snip>

A true controlled resistance is actually an interesting component.

Indeed, but there are gotchas for the unwary with CdS cells. Maybe
these 'optocopplers' are different, but CdS cells exhibit a light
history effect which makes their resistance difficult to predict.
They're also slow, and the slowness also depends on light history.

Cheers
--
Keith Wootten

 

[Roy McCammon]

Jim Thompson wrote:

"Cobbler"

probably meant clobberer

any old stick will do.

...Jim Thompson

--
local optimization seldom leads to global optimization

my e-mail address is: <my first name> <my last name> AT mmm DOT com

 

[Jan Panteltje]

On a sunny day (Mon, 17 May 2004 16:57:14 -0700) it happened John Larkin
<jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote in
<lkjia058djd9sdip5at4sjcq7gdk2ar53i@4ax.com>:

On Mon, 17 May 2004 22:53:04 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (17 May 2004 09:08:30 -0700) it happened Winfield Hill
Winfield_member@newsguy.com> wrote in <c8ao1u023a6@drn.newsguy.com>:

An exciting new kind of part, the LT series Optocopplers:

"Often these units are referenced to as Optocoplers, as they
function similar to standard copplers..."

http://optoelectronics.perkinelmer.com/catalog/Category.aspx?CategoryName=LT+Series

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)
In the 60ties, in the TV studio, in the old huge tube mixer, they used
bulbs and LDR to control audio...
Things such as drift, aging, mmm probelms..
Lets go digital.
LDR was slow btw.
JP

HP made a analog voltmeter ca 1964, the 425A, that went down to +-10
uv and +-10 pa full-scale on its zero-center, mirrored meter. It used
photoresistors as the chopper modulator and demodulator switches, with
a clock-motor driven optical chopper and an incandescent lamp to
switch the photojobbies. It was very cool. $500, which is more like
$5000 in today's money.
What frequency did that chop?

Not very high?
CdS is very slow on low light, a bit better on higher light intensities.
Using photo resistors DOES solve a lot of design problems with coupling
JP

 

[Tom Del Rosso]

In news:fkeia0p5fs0kodoeild0b6dv96gl0smmmq@4ax.com,
Jim Thompson typed:

A Peach-Apricot Copulator ?

Peaches and apricots can get married in Massachusettes now.


--
-Reply in group, but if emailing add 2 more zeros-
-and remove the obvious-

 

[John Larkin]

On Tue, 18 May 2004 21:18:50 GMT, "Tom Del Rosso"
<tdnews01@att.net.invalid> wrote:

In news:fkeia0p5fs0kodoeild0b6dv96gl0smmmq@4ax.com,
Jim Thompson typed:

A Peach-Apricot Copulator ?

Peaches and apricots can get married in Massachusettes now.

Plums and apricots have been legally marrying in California for a
couple of years now. Their offspring is called a Pluot, and they are
mighty tasty.

John

 

[John Larkin]

On Tue, 18 May 2004 15:49:23 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

HP made a analog voltmeter ca 1964, the 425A, that went down to +-10
uv and +-10 pa full-scale on its zero-center, mirrored meter. It used
photoresistors as the chopper modulator and demodulator switches, with
a clock-motor driven optical chopper and an incandescent lamp to
switch the photojobbies. It was very cool. $500, which is more like
$5000 in today's money.

What frequency did that chop?

It's been a while; I was just a kid last time I saw one. Does anybody
know? I seem to vaguely remember 40 Hz or something. It used a little
flat clock motor spinning an aluminum disk, with not a lot of holes.
CdSe cells are faster than CdS... not as good stability-wise, but OK
as choppers.

I should add one to my collection. It was very cool for its time.

John