Driver to drive?

[John Larkin]

On 11 Oct 2004 07:12:45 -0700, hashem_aref@ureach.com (S. hashem Aref)
wrote:

John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in message news:<2auim05sngr1acfolic4do4kkl93991jjd@4ax.com>...
On 9 Oct 2004 23:38:58 -0700, hashem_aref@ureach.com (S. hashem Aref)
wrote:

Winfield Hill <Winfield_member@newsguy.com> wrote in message news:<ck91mq035t@drn.newsguy.com>...
S. hashem Aref wrote...

Is there anyone how can design a simple circuit for Avalanch
photodiode bias.
I want to use it instead of PIN photodiode and I just need to
measure changing of light. I don't need high responsivity of APD.

Specification of APD:
Sensitivity@1310: .86 A/W
Vr=5v

Read the "Avalanche Photodiodes: A User's Guide" article at this
site, and consider the issue of bias voltage control (figure 2).
http://optoelectronics.perkinelmer.com/Service/whitepapers.html

thanks. That helped me but there wasn't any bias circuit diagram in
this whitpaper. Please let me know if evryone have any suggestion for
simple bias circuit for APD. I didn't require to detect very low level
optical signal. I have to use it becease I don't have a PIN photodiode
at now.


The APD *is* a PIN diode. If you run it at a smallish reverse bias, it
won't have any avalanche gain, and it will work like any other PIN. If
you don't need high sensitivity, just bias it at -5 or -10 and it
should work fine. Avalanche bias levels are usually higher, 60 volts
or some such.

thanks,
When I run it with Vr=5v and illuminated it with laser diode @1550nm
and power=1.5mw I saw a very low voltage in output of load resistance
(RL=100 ohm) that voltage was about .04mv.
If you want to look at my circuit I can attach for you.

What kind of diode is it? If it's sensitive at 1550, you might expect
numbers like 0.5 a/w in non-avalanche mode. But that's based on using
fiberoptics or a very good focussing lens to get all the beam power
onto the sensitive part of the pd; if you just illuminate a photodiode
with a typical laser, only a minute fraction of the beam is absorbed
by the tiny pd, so you've got to reduce the 0.5a/w sensitivity by the
pd/beam area ratio.

John

 

[Nicholas O. Lindan]

kieronmichael@yahoo.co.uk (Kieron) wrote:

Does anyone have a copy (or can point me in the right direction) of a
circuit diagram for a frequency to voltage converter with a low pass
filter.

Again, a cheap uP can be used for this application. Use the timer
(heck, a program loop) for measuring the frequency and put the value
out on the chip's D/A. Do all the filtering you want in software: 12-pole
elliptical, no problem.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com

 

[Rolavine]

From: soar2morrow@yahoo.com (Tom Seim)

But what are the options? Kerry seems to think that by talking,
sternly, to somebody they will do what he wants. Really. Even w/o
nukes an invasion of NK would result in the losses you predicted.

I don't know, I'm to busy now to even look at this stuff. The US has not been

talking to N. Korea at all and they are developing more weapons. It seems to
me there was a time a few years ago when the Bush admin could have had some
real leverage during their famine. Instead of using that we got the axis of
evil. While I don't know much about negotiation I feel calling a country evil
is not a good starting point.

Kim Jon Ill is an extremely paranoid man. The Chinese have the best
shot at reasoning with the guy.

He seems both crazy and power mad to me, qualties I find in Bush at lower

levels. I don't know what the Chinese have been doing in these negotiations.
Any realistic judgment of the possibilities for sucess would have to be based
on more study than I have time for. Maybe you can fill us in. Have the Chinese
made any specific threats to the KIM, what carrots and what sticks?

Rocky

 

[Rich Grise]

On Monday 11 October 2004 07:02 am, Je m'ennuie did deign to grace us with
the following:

Getelec <m.pelissou@get-electronique.fr> says...

Les 2 ampli-op font appel au męme modčle spice.
Au lancement de la simulation, Prospice m'indique une erreur d'affectation
des alims du 2čme ampli-op.
Il faut dire au 2čme ampli-op oů se trouvent les alims, qui sont sur le
1er ampli-op.
Les 2 moyens envisageables sont par la commande SPICEPINS ou en modifiant
le modčle, et je ne sais pas comment y parvenir.

Merci de votre conseil

Getelec

*Plonk*. Dorénavant je ne verrai plus tes messages.

Shouldn't that be "le Plonque"? ;-)

Cheers!
Rich

 

[John Larkin]

On Mon, 11 Oct 2004 02:32:09 GMT, Scott Stephens <scottxs@comcast.net>
wrote:

Dirk Bruere at Neopax wrote:

John Larkin wrote:

On Sun, 10 Oct 2004 22:08:09 GMT, Chris Carlen

If you don't mail bombs or military secrets, you'll be fine. Or you
can use UPS for the subversive stuff.


Or simply email the military secrets.

Shyit, was is Los Alamos that nuclear secrets were just wandering off,
with the fed-thugs irrationally hassling scientists like Wen Ho Lee?

Mr Lee did some very strange stuff, played the race card, and got off
pleading guilty to a minor offense.

John

 

[John Larkin]

On Sun, 10 Oct 2004 19:39:00 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

The truth on this is quite innocent. "Media mail" is something like an
extension of "book rate" - a discounted rate. Some people have taken
to mailing items that do not qualify for media mail as media mail to
save a few dollars, so the USPO must reserve the right to inspect the
packages or envelopes if you want to get the discounted rate.

Damn, Spehro, you have shot down another perfectly good
facist-atrocity story. I bet you don't even believe in black
helicopters.

John

 

[John Larkin]

On Mon, 11 Oct 2004 16:28:38 GMT, Rich Grise <null@example.net> wrote:

On Monday 11 October 2004 07:02 am, Je m'ennuie did deign to grace us with
the following:


Getelec <m.pelissou@get-electronique.fr> says...

Les 2 ampli-op font appel au męme modčle spice.
Au lancement de la simulation, Prospice m'indique une erreur d'affectation
des alims du 2čme ampli-op.
Il faut dire au 2čme ampli-op oů se trouvent les alims, qui sont sur le
1er ampli-op.
Les 2 moyens envisageables sont par la commande SPICEPINS ou en modifiant
le modčle, et je ne sais pas comment y parvenir.

Merci de votre conseil

Getelec

*Plonk*. Dorénavant je ne verrai plus tes messages.

Shouldn't that be "le Plonque"? ;-)

Cheers!
Rich

I thought that "ampli-op" was really cute. They didn't teach that to
me in high school French class. They did, however, show us tourist
movies of the French Riviera that were, um, very revealing.

John

 

[Ban]

John Larkin wrote:

I thought that "ampli-op" was really cute. They didn't teach that to
me in high school French class. They did, however, show us tourist
movies of the French Riviera that were, um, very revealing.

Was that Luis de Funes as a flic(cop) spying on the nude beach? That really
was funny!

--
ciao Ban
Bordighera, Italy

 

[Paul Burridge]

On Sun, 10 Oct 2004 19:25:58 GMT, Rich Grise <null@example.net> wrote:

There's more stuff at that site, for example:
http://www.j-walk.com/other/tattooid/index.htm

Hehe! Thanks, Rich. I must give the site a full checkover some time.
--

"What is now proved was once only imagin'd." - William Blake, 1793.

 

[Carl D. Smith]

On Sun, 10 Oct 2004 22:08:09 GMT, Chris Carlen
<crobc@BOGUS_FIELD.earthlink.net> wrote:

Then suddenly a guy jumped into our conversation, and said the
following: "frankly, right now I think that being safe is a lot more
important than Constitutional rights."

"They who would give up an essential liberty for temporary
security, deserve neither liberty or security."
- Benjamin Franklin

 

[John Larkin]

On Mon, 11 Oct 2004 17:16:20 GMT, Rich Grise <null@example.net> wrote:

Unless they're stopped, of course. Don't be fooled by the fact that the
US used to be the land of the Free - this is where the nazis have taken
up residence, except for the handful or so that are running Israel. Can't
happen here? Open your eyes, folks.

Better you should take your meds.

John

 

[Joerg]

Hi Spehro,

Plonk is that wine you get on the menu prix fixe, when it is
"vin et boisson compris" (my 'survival' level French... )


Is that the stuff where it says "Mise en bouteille dans notre garage" on

the cork?

Regards, Joerg

http://www.analogconsultants.com

 

[Dirk Bruere at Neopax]

John Larkin wrote:

On Mon, 11 Oct 2004 17:16:20 GMT, Rich Grise <null@example.net> wrote:


Unless they're stopped, of course. Don't be fooled by the fact that the
US used to be the land of the Free - this is where the nazis have taken
up residence, except for the handful or so that are running Israel. Can't
happen here? Open your eyes, folks.



Better you should take your meds.

Don't worry.
In the neocon New World Order everyone will be forced to take their meds, and
pay for them directly at multinational jacked up monopoly prices.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[mike]

Ryan Ashline wrote:

I am looking for a 12 volt timer or looking to build one. What I
would like it to do is when powered wait for approx 3 mins (doesnt
have to be close 15 sec or so +- would be ok) Then trigger a light I
have for 2-3 secs shut off then repeat the entire sequence again. 3
mins off 3 secs on. Would some please point me in the right
direction?

Thanks for your time

Ryan Ashline

Dig up a 555 datasheet and build the astable.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Spehro Pefhany]

On Mon, 11 Oct 2004 08:28:24 GMT, the renowned "Ban" <bansuri@web.de>
wrote:

Greg K wrote:
I need some help with the schematic/design of a digital power meter or
watt meter if you prefer. The objective is to be able to measure the
power output from an amp driving a speaker. I understand I need to
measure current, voltage, and cos(phi). The current and voltage should
be obtainable through A/D converters. Measuring the phase angle I am
not sure about yet. The output of the final result will be displayed
on 7-segment LEDs.

The way I see it is that a DMM can do voltage and current but can't
multiply them together and give you a power reading. I don't know what
chips a DMM might use to do this though. Right now I'd be happy with
some circuitry to measure voltage and current; multiply them and get a
display.

If you need any clarifications about this, please ask.

Greg,
you do not need to measure cos_phi, because it is contained in the other two
measurements. If you multiply the momentary values of voltage and current
with each other, the output will be the momentary power, which you will have
to process for RMS with the appropriate time constants. You could also use
an analog multiplier and feed its output to the true RMS DMM. Or(best) you
could use your soundcard to sample voltage and current and use some software
like matlab for processing.

I like this meter:
http://www.aqdi.com/PowerMeterLarge.jpg

It reads in "RMS watts", not those nasty regular watts.

 

[Tweetldee]

"Greg K" <gregk@anywhereusa.com> wrote in message
news:ce05fab9.0410111017.58d96a60@posting.google.com...

"Ban" <bansuri@web.de> wrote in message
news:<Iurad.108425$35.5436232@news4.tin.it>...
Greg,
you do not need to measure cos_phi, because it is contained in the other
two
measurements. If you multiply the momentary values of voltage and current
with each other, the output will be the momentary power, which you will
have
to process for RMS with the appropriate time constants. You could also
use
an analog multiplier and feed its output to the true RMS DMM. Or(best)
you
could use your soundcard to sample voltage and current and use some
software
like matlab for processing.

I'm glad to hear instantaneous measurement of current and voltage will
nullify the need for cos(phi). This should simplify my design a bunch.

Now, what would I use to measure the instantaneous values for I and V
(A/D converter?) and give me an output, preferably digital because
that would be easier to multiply or am I on the totally wrong track?

Since I am building a stand-alone meter, sending the multiplier output
to a DMM is not really practical. I suppose I can multiply the I and V
in analog and then send the signal to an RMS chip but I don't know
what the output of an RMS chip is or what to use for that matter.

The ideas are good, please keep them coming.

You might investigate the four-quadrant multiplier/divider ICs available
from Analog Devices or Texas Instruments. Devices such as the AD532, AD534,
AD538, AD632, etc. do most of the work for you (the math), leaving you with
the menial task of scaling, digitizing and diisplaying the output.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

 

[Frank Bemelman]

"John Larkin" <jjlarkin@highSNIPlandTHIStechPLEASEnology.com> schreef in
bericht news:moklm0dq5c1l4ja7ig138acll24uh27ggt@4ax.com...

On Mon, 11 Oct 2004 18:59:06 +0100, Dirk Bruere at Neopax
dirk@neopax.com> wrote:

John Larkin wrote:

On Mon, 11 Oct 2004 17:16:20 GMT, Rich Grise <null@example.net> wrote:


Unless they're stopped, of course. Don't be fooled by the fact that the
US used to be the land of the Free - this is where the nazis have taken
up residence, except for the handful or so that are running Israel.
Can't
happen here? Open your eyes, folks.



Better you should take your meds.

Don't worry.
In the neocon New World Order everyone will be forced to take their meds,
and
pay for them directly at multinational jacked up monopoly prices.


It does indeed sound like facism is on the march in America:

http://www.georgewbush.com/news/Read.aspx?ID=3874

The 'right' circumstances is what makes such things grow.


--
Thanks, Frank.
(remove 'x' and 'invalid' when replying by email)

 

[Andreas Hadler]

John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote:

That would be interesting: a one-time-read RAM, where readout was
absolutely destructive.

Just an old fashioned core memory?

Andreas
--
"When your hammer is C++, everything begins to look like a thumb."
- Steve Haflich, in comp.lang.c++

 

[Rich Grise]

On Monday 11 October 2004 10:26 am, Ryan Ashline did deign to grace us with
the following:

I am looking for a 12 volt timer or looking to build one. What I
would like it to do is when powered wait for approx 3 mins (doesnt
have to be close 15 sec or so +- would be ok) Then trigger a light I
have for 2-3 secs shut off then repeat the entire sequence again. 3
mins off 3 secs on. Would some please point me in the right
direction?

Thanks for your time

http://www.national.com/pf/LM/LMC555.html

There's a circuit in there, and a chart of RC values, from there it's
just a little arithmetic. I'm not sure what the best caps are these
days - it used to be polyester, but I've been out of the loop for
awhile - look for "low leakage".

Failing that, look for the 4020/4040/4060 - the 4060 has its own
internal oscillator. You can get an arbitrary time delay with one
of these and a little bit of logic.

Have Fun!
Rich

 

[Rich Grise]

On Monday 11 October 2004 10:23 am, Carl D. Smith did deign to grace us with
the following:

On Sun, 10 Oct 2004 22:08:09 GMT, Chris Carlen
crobc@BOGUS_FIELD.earthlink.net> wrote:


Then suddenly a guy jumped into our conversation, and said the
following: "frankly, right now I think that being safe is a lot more
important than Constitutional rights."

"They who would give up an essential liberty for temporary
security, deserve neither liberty or security."
- Benjamin Franklin

Hear! Hear!

Vote Libertarian!
Rich