Chip with simple program for Toy

[Don Kelly]

----------------------------
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:69s5rvF349nrpU1@mid.individual.net...

"Don Kelly"

The " true rms" function on a DMM is *not* obtained by sampling. It
is
normally obtained by the use of a " true rms to DC" converter IC -
generally one made by Analog Devices like the AD736.
-----------
If it is not sampling- then what is it? Thermal? There is a little black
box in the device which is just that- a little black box.
I presently have problems getting the applicable pdf from the Analog
device site.


** Analog Devices have been supplying " true rms to DC converter " ICs for
about 30 years.

The data sheet for the AD636 will give you some idea how it computes the
DC value of an AC input.

http://www.farnell.com/datasheets/57885.pdf

Use Google for more info.

Don't be so damn lazy.



..... Phil
----

The data sheet that you reference tells how the device is made- with two
black boxes-the squarer/divider and the current mirror. It does not explain
what each of these components actually do.
So -no new information. As I said, the pdf reference at Analog devices
doesn't come through completely- just a few lines on a few pages -enough to
hint and tantalise but not enough to be of use.
It's not for lack of trying for information.

What I wanted to know was what was in these boxes in broad terms of their
terms of their operation as there are several ways to get a true rms
measurement (assuming component frequencies outside the meter's bandwidth
can be ignored).

If you don't know, say so.


Don Kelly dhky@shawcross.ca
remove the X to answer

 

[Phil Allison]

"Don Kelly"
"Phil Allison"

** Analog Devices have been supplying " true rms to DC converter " ICs
for about 30 years.

The data sheet for the AD636 will give you some idea how it computes the
DC value of an AC input.

http://www.farnell.com/datasheets/57885.pdf

Use Google for more info.

Don't be so damn lazy.


The data sheet that you reference tells how the device is made- with two
black boxes-the squarer/divider and the current mirror. It does not
explain what each of these components actually do.

** So you missed the schematic in figure 9 entirely ???

Wanker.

So -no new information.

** Bollocks.

It is all new information in relation to your original *dumb* question -
wanker.

What I wanted to know was what was in these boxes in broad terms of their
terms of their operation as there are several ways to get a true rms
measurement (assuming component frequencies outside the meter's bandwidth
can be ignored).

**The data sheet for the AD536 has more detail plus quotes the maths
formulae device operation relies on:

http://www.farnell.com/datasheets/57860.pdf

See fig. 9 again and the text around it headed:

" AD536A Principle of Operation ".


Then fuck off.




....... Phil

 

[Phil Allison]

"Don Kelly = Shithead "

As I said, the pdf reference at Analog devices doesn't come through
completely- just a few lines on a few pages

** Nice of you to OMIT to say what fucking " pdf " on the Analog Devices
site you are crapping on about.

But if you go to:

http://www.analog.com/en/prod/0,2877,773%255F866%255FAD736,00.html

click on " Application Notes" and then click on:

" Section I: RMS to DC Conversion - Theory "

A nice 2.8 MB pdf file appears, complete.

Wanker.



....... Phil

 

[Dave Martindale]

Bill Bowden <wrongaddress@att.net> writes:

Look at it this way: You have a 1KW space heater you run half the time
(1 hour on and 1 hour off). The average power is 500 watts. Say the
heater voltage is 100 VDC and the current is 10 amps, and the heater
resistance is 10 ohms. So, the question is what RMS voltage will give
you 500 watts at 10 ohms and 100 volts peak? Work that out and we find
the voltage to be 70.7 and the RMS current to be 7.07 amps.

So, it looks like for a square wave, the RMS voltage or current is the
peak divided by the square root of 2.

That's for an "alternate on and off" square wave, where one of the two
voltage levels is zero.

More often, though, when someone says "square wave", they mean an AC
square wave with no DC component, and two voltage levels +V and -V that
are symmetric about zero. For *that* square wave, rms voltage is equal
to peak voltage.

Dave

 

[Dave Martindale]

Bill Bowden <wrongaddress@att.net> writes:

Look at it this way: You have a 1KW space heater you run half the time
(1 hour on and 1 hour off). The average power is 500 watts. Say the
heater voltage is 100 VDC and the current is 10 amps, and the heater
resistance is 10 ohms. So, the question is what RMS voltage will give
you 500 watts at 10 ohms and 100 volts peak? Work that out and we find
the voltage to be 70.7 and the RMS current to be 7.07 amps.

So, it looks like for a square wave, the RMS voltage or current is the
peak divided by the square root of 2.

That's for an "alternate on and off" square wave, where one of the two
voltage levels is zero.

More often, though, when someone says "square wave", they mean an AC
square wave with no DC component, and two voltage levels +V and -V that
are symmetric about zero. For *that* square wave, rms voltage is equal
to peak voltage.

Dave

 

[Phil Allison]

"D. Ismay"

Don Kelly wrote:

What I wanted to know was what was in these boxes in broad terms of their
terms of their operation as there are several ways to get a true rms
measurement (assuming component frequencies outside the meter's bandwidth
can be ignored).

The 'cover' PDF gives a fairly clear and thorough description of how the
RMS-DC convertor is designed, down to the level of a few basic functional
blocks.

** The link I originally supplied him for the AD636 has a full description
of how the device operates INCLUDING a detailed internal schematic.

http://www.farnell.com/datasheets/57885.pdf

See the section starting on page 5, " AD636 Principle of Operation ".

Did you expect others to do your homework for you?

** The fool cannot see what is right in front of his eyes.

Usual disability of all wankers.


....... Phil

 

[Phil Allison]

"D. Ismay"

Don Kelly wrote:

What I wanted to know was what was in these boxes in broad terms of their
terms of their operation as there are several ways to get a true rms
measurement (assuming component frequencies outside the meter's bandwidth
can be ignored).

The 'cover' PDF gives a fairly clear and thorough description of how the
RMS-DC convertor is designed, down to the level of a few basic functional
blocks.

** The link I originally supplied him for the AD636 has a full description
of how the device operates INCLUDING a detailed internal schematic.

http://www.farnell.com/datasheets/57885.pdf

See the section starting on page 5, " AD636 Principle of Operation ".

Did you expect others to do your homework for you?

** The fool cannot see what is right in front of his eyes.

Usual disability of all wankers.


....... Phil

 

[Tom Biasi]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:e92d9779-6aeb-48d5-a3c0-f04e40514874@w34g2000prm.googlegroups.com...

I've been looking for a transistor regen schematic, finally found one,
but it doesn't give the coil specs. I want to receive the AM band,
from 530 kHz-1500 kHz. Any help on this very much appreciated.
http://www.techlib.com/electronics/regen.html

Thanks,
Dave

Do you really want to receive the entire BC band at once?
Notice that the designer put in a trap to keep BC band out.

 

[Tom Biasi]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:e92d9779-6aeb-48d5-a3c0-f04e40514874@w34g2000prm.googlegroups.com...

I've been looking for a transistor regen schematic, finally found one,
but it doesn't give the coil specs. I want to receive the AM band,
from 530 kHz-1500 kHz. Any help on this very much appreciated.
http://www.techlib.com/electronics/regen.html

Thanks,
Dave

Do you really want to receive the entire BC band at once?
Notice that the designer put in a trap to keep BC band out.

 

[Tom Biasi]

"Don Bowey" <dbowey@comcast.net> wrote in message
news:C4601055.B9A96%dbowey@comcast.net...

On 5/26/08 3:20 AM, in article
xoqdnalmW9FRE6fVnZ2dnUVZ_rrinZ2d@giganews.com, "Tom Biasi"
tombiasi@optonline.net> wrote:


"Dave.H" <the1930s@googlemail.com> wrote in message
news:e92d9779-6aeb-48d5-a3c0-f04e40514874@w34g2000prm.googlegroups.com...
I've been looking for a transistor regen schematic, finally found one,
but it doesn't give the coil specs. I want to receive the AM band,
from 530 kHz-1500 kHz. Any help on this very much appreciated.
http://www.techlib.com/electronics/regen.html

Thanks,
Dave

Do you really want to receive the entire BC band at once?
Notice that the designer put in a trap to keep BC band out.



The trap is a mod that can be used, if needed, when using the receiver on
shorter wavelengths. It would not be present when the BCB is wanted.

The broadcast band would swamp a regen receiver.

The selectivity or lack of would render that band useless for the receiver.
I suspect that's why the trap was added.

Tom

 

[Tom Biasi]

"Don Bowey" <dbowey@comcast.net> wrote in message
news:C4601055.B9A96%dbowey@comcast.net...

On 5/26/08 3:20 AM, in article
xoqdnalmW9FRE6fVnZ2dnUVZ_rrinZ2d@giganews.com, "Tom Biasi"
tombiasi@optonline.net> wrote:


"Dave.H" <the1930s@googlemail.com> wrote in message
news:e92d9779-6aeb-48d5-a3c0-f04e40514874@w34g2000prm.googlegroups.com...
I've been looking for a transistor regen schematic, finally found one,
but it doesn't give the coil specs. I want to receive the AM band,
from 530 kHz-1500 kHz. Any help on this very much appreciated.
http://www.techlib.com/electronics/regen.html

Thanks,
Dave

Do you really want to receive the entire BC band at once?
Notice that the designer put in a trap to keep BC band out.



The trap is a mod that can be used, if needed, when using the receiver on
shorter wavelengths. It would not be present when the BCB is wanted.

The broadcast band would swamp a regen receiver.

The selectivity or lack of would render that band useless for the receiver.
I suspect that's why the trap was added.

Tom

 

[christofire]

"Allen" <allen.versfeld@gmail.com> wrote in message
newsp.ubr0x3xxh37c9k@supermole.mole.boldlygoingnowhere.org...

On Mon, 26 May 2008 18:39:47 +0200, Dave.H <the1930s@googlemail.com
wrote:



What pins would I connect to on the LM386? I just found one of these
in my junk box, and want to use it.

Before somebody swears at you, have you considered browsing to your
favourite
search engine and entering 'LM386 datasheet'? It's free, it shows
initiative,
and you'll get a result FAR more quickly than waiting for somebody to do
it
for you.

I couldn't agree more. In fact, at the risk of sounding like a boring old
fart (or a teacher), nowadays there seems to be little point in constructing
any kind of simple radio other than for the purpose of discovering for one's
self how the things work, how they're designed and put together, and what
the design options are. Asking people in a Usenet group for elementary
stuff like this just seems bonkers and counter-productive - if the desire is
only to obtain a working radio with the least effort then the best solution
is to visit a pound shop (in the UK; five and dime, etc. elsewhere).

But perhaps any blame should be shared by all the willing, helpful
collaborators (including myself on occasion) who rise to the bait! Perhaps
if every banal request was met by a standard 'go Google it' response every
time the perpetrators would get the message and become bored of asking the
obvious. The grey area would be those requests for which the responses
sometimes turn up facts useful to others.

Chris

 

[christofire]

"Allen" <allen.versfeld@gmail.com> wrote in message
newsp.ubr0x3xxh37c9k@supermole.mole.boldlygoingnowhere.org...

On Mon, 26 May 2008 18:39:47 +0200, Dave.H <the1930s@googlemail.com
wrote:



What pins would I connect to on the LM386? I just found one of these
in my junk box, and want to use it.

Before somebody swears at you, have you considered browsing to your
favourite
search engine and entering 'LM386 datasheet'? It's free, it shows
initiative,
and you'll get a result FAR more quickly than waiting for somebody to do
it
for you.

I couldn't agree more. In fact, at the risk of sounding like a boring old
fart (or a teacher), nowadays there seems to be little point in constructing
any kind of simple radio other than for the purpose of discovering for one's
self how the things work, how they're designed and put together, and what
the design options are. Asking people in a Usenet group for elementary
stuff like this just seems bonkers and counter-productive - if the desire is
only to obtain a working radio with the least effort then the best solution
is to visit a pound shop (in the UK; five and dime, etc. elsewhere).

But perhaps any blame should be shared by all the willing, helpful
collaborators (including myself on occasion) who rise to the bait! Perhaps
if every banal request was met by a standard 'go Google it' response every
time the perpetrators would get the message and become bored of asking the
obvious. The grey area would be those requests for which the responses
sometimes turn up facts useful to others.

Chris

 

[Ben Miller]

D. Ismay wrote:

Don Kelly wrote:
[...]

What I wanted to know was what was in these boxes in broad terms of
their terms of their operation as there are several ways to get a
true rms measurement (assuming component frequencies outside the
meter's bandwidth can be ignored).

The 'cover' PDF gives a fairly clear and thorough description of how
the RMS-DC convertor is designed, down to the level of a few basic
functional blocks.

Did you expect others to do your homework for you?

He obviously did not get the entire document, for whatever technical reason.
Therefore, he didn't see the other information.
Since you apparently don't frequent this newsgroup, you might want to do
some homework yourself before you direct comments like that at an engineer
who can run circles around you in terms of his electrical knowledge.


--
Benjamin D Miller, PE
www.bmillerengineering.com

 

[Phil Allison]

"Ben Miller"

D. Ismay wrote:

The 'cover' PDF gives a fairly clear and thorough description of how
the RMS-DC convertor is designed, down to the level of a few basic
functional blocks.

Did you expect others to do your homework for you?

He obviously did not get the entire document, for whatever technical
reason.

** Try following the thread - pal.

All the info was in the FIRST link I supplied( to the AD636) and he could
see ALL of that.

Therefore, he didn't see the other information.

** BOLLOCKS !

Since you apparently don't frequent this newsgroup, you might want to do
some homework yourself before you direct comments like that at an engineer
who can run circles around you in terms of his electrical knowledge.

** Shame how you cannot even follow a simple thread - let alone see
through that arrogant fake Kelly.




...... Phil

 

[Don Kelly]

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:69umtcF34bpndU1@mid.individual.net...

"Don Kelly"
"Phil Allison"

** Analog Devices have been supplying " true rms to DC converter " ICs
for about 30 years.

The data sheet for the AD636 will give you some idea how it computes
the DC value of an AC input.

http://www.farnell.com/datasheets/57885.pdf

Use Google for more info.

Don't be so damn lazy.


The data sheet that you reference tells how the device is made- with two
black boxes-the squarer/divider and the current mirror. It does not
explain what each of these components actually do.


** So you missed the schematic in figure 9 entirely ???

Wanker.
-----------

Yes- I only got the first page -hence the question.
Now I have the full pdf and see the process.

Thank you for your "courteous" response.

--

Don Kelly dhky@shawcross.ca
remove the X to answer
----------------------------

 

[Phil Allison]

"Don Kelly"
"Phil Allison"

** Analog Devices have been supplying " true rms to DC converter " ICs
for about 30 years.

The data sheet for the AD636 will give you some idea how it computes
the DC value of an AC input.

http://www.farnell.com/datasheets/57885.pdf

Use Google for more info.

Don't be so damn lazy.


The data sheet that you reference tells how the device is made- with
two black boxes-the squarer/divider and the current mirror. It does not
explain what each of these components actually do.


** So you missed the schematic in figure 9 entirely ???

Wanker.
-----------
Yes- I only got the first page -hence the question.

** You made no mention of seeing only one page - such data sheets never
have just one page with no specs.

PLUS the site YOU claimed to have trouble with was NOT the Farnell site -
as given in the link above.

So I think you are lying.

Now I have the full pdf and see the process.

Thank you for your "courteous" response.

** Go get fucked - you lying pig.



...... Phil

 

[Don Kelly]

----------------------------
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:69uogfF338mqlU1@mid.individual.net...

"Don Kelly = Shithead "

As I said, the pdf reference at Analog devices doesn't come through
completely- just a few lines on a few pages


** Nice of you to OMIT to say what fucking " pdf " on the Analog
Devices site you are crapping on about.

But if you go to:

http://www.analog.com/en/prod/0,2877,773%255F866%255FAD736,00.html

click on " Application Notes" and then click on:

" Section I: RMS to DC Conversion - Theory "

A nice 2.8 MB pdf file appears, complete.

Wanker.



...... Phil

-----------------

As I said before, after several attempts, for some unknown reason, I was not
getting the full pdf -(it was the pdf you cite below) and only got parts of
a few of the introductory pages.

Tonight I tried again and got the necessary information.

If I had it earlier, I wouldn't have continued to bother you and I thank you
for directing me to a reference, in spite of your innate boorishness.

--

Don Kelly dhky@shawcross.ca
remove the X to answer

 

[Phil Allison]

"Don Kelly"

** Nice of you to OMIT to say what fucking " pdf " on the Analog
Devices site you are crapping on about.

But if you go to:

http://www.analog.com/en/prod/0,2877,773%255F866%255FAD736,00.html

click on " Application Notes" and then click on:

" Section I: RMS to DC Conversion - Theory "

A nice 2.8 MB pdf file appears, complete.

Wanker.


As I said before, after several attempts, for some unknown reason, I was
not getting the full pdf -(it was the pdf you cite below) and only got
parts of a few of the introductory pages.

** Next time - SAY just what file you are crapping on about !!!!

Wanker.

If I had it earlier, I wouldn't have continued to bother you

** I supplied TWO links to files that had the needed info from another
site - ie Farnell.

You simply did not read them.

You are one lying, PITA fucking PIG.




...... Phil

 

[Frnak McKenney]

On Mon, 26 May 2008 15:45:54 -0700 (PDT), Kasterborus <kasterborus@yahoo.com> wrote:

I just hooked up a Sharp GP2D12 IR range sensor to a scope and saw
that the output is very noisy. The sensor updates at 25Hz so I was
thinking that if I were to add some kind of 25Hz low pass filter to
the output that would clean things up.

You might check the archives of comp.robotics.misc. I recall several
discussions about the amount of current that some (all?) of the
Sharp IR rangers consumed.

I do know from personal experience that an IR remote control unit
such as the Siemens SFH506 (admittedly a slightly different device)
can go from "flaky" to "fantastic" when a 100Ohm/100uF filter is
added to keep the device's voltage up.

Hope this helps...


Frank McKenney
--
Government is the great fiction, through which everybody
endeavors to live at the expense of everybody else.
-- Frederic Bastiat, French Economist
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney ayut mined spring dawt cahm (y'all)