Driver to drive?

[josephkk]

On Sat, 02 Feb 2013 09:00:20 +0200, upsidedown@downunder.com wrote:

On Sun, 27 Jan 2013 14:05:08 -0800, MrTallyman
MrTallyman@BananaCountersRUs.org> wrote:


The right move for the entire industry would be to place the DC source
conversion IN THE LAMP and make the "light bulbs" just the LEDs and
current limit elements and attachment socket stub.

A better approach for the industry would to standardize some
constant_currents_ (DC) such as 20/50/100/350/1000 mA so that any
light panel from any manufacturer rated for a specific constant
current could be plugged into a series string, just like christmas
tree lights.

In a system driven by a constant current, each load would have the
same current, but the voltage could be different, depending of the
power levels needed. This is very similar as the Pxxnn series tubes
used in old European TVs, in which the filaments were in series across
the 220 Vac mains (with some inrush current limiting).

For larger LED panels it would be mechanically feasible to use
multiple constant current generators with separate strings with two or
more of those standard currents through the sockets. The panels would
only have pins for the required current and the socket would short
circuit the unused current lines, maintaining loop continuity. Some
open/short circuit detection at each constant current source could
take out unused current loops.

Interesting idea. Been used before, in many locations around the world
series street lighting has been used. There would be a high voltage
constant current transformer sourcing many luminaries along the roadway.
What i am not clear on is just how the rest of the string continued when
any single luminaire failed.

?-)

 

[John Doe]

John Fields <jfields austininstruments.com> wrote:

The common pyroelectric motion sensor outputs a single pulse
when the incident radiation which falls on the detector has a
higher or lower wavelength than that of the ambient radiation
within the field of view of the transducer.

FWIW...
I will plan to use that, that will be easiest. I will see if the
output can be made to flash a light as long as motion is being
detected, without a long delay or long on-time.



--
Thanks to the replies.

 

[Tim Williams]

"josephkk" <joseph_barrett@sbcglobal.net> wrote in message
news:2geug8l1l362htph8v0lee6r66diio5ijk@4ax.com...

Interesting idea. Been used before, in many locations around the world
series street lighting has been used. There would be a high voltage
constant current transformer sourcing many luminaries along the roadway.
What i am not clear on is just how the rest of the string continued when
any single luminaire failed.

Antifuse, of course

Same reason x-mas light strings don't (always) go out when a bulb fails --
they do that by wrapping the (probably molybdenum) terminals with anodized
aluminum; when the bulb burns out, the anodizing breaks down (at 100V,
say) and shorts out.

I've seen some of the hardware they use in this area. Lots of old
circuits with CC transformers, usually a few kilovolts total loop at 10A
or so. Each light only drops what it needs, usually 200V or so.

Tim

--
Deep Friar: a very philosophical monk.
Website: http://seventransistorlabs.com

 

[Jasen Betts]

On 2013-02-03, John Doe <jdoe@usenetlove.invalid> wrote:

What I would like to do is have a lightbulb or LED
brightness/intensity follow the motion sensor output part. In
other words... If a bird flies by, the lightbulb would momentarily
dimly light. If a person walks into close range, the lightbulb
would continuously shine brightly. If the person walked behind
some object, the lightbulb would go off, and then when they
reappeared, the lightbulb would come back on. Hopefully I'm not
over describing this, but I'll be happy to provide more
description if asked.

these sensors detect movement by having two "pixels" that are focused by
the lens onto alternating bands of the scene, the sensors only produce
a signal proportional to the rate of change of average temperature of
the area viewed by the pixel.

a person walking across the fiels od view would produce a signal that
alternates between the two sensors.

Does such a device (or close) already exist for purchase in a
store?

I've not heard of one.

The sensor output part typically could not be connected to an LED
without putting an amplifier on it? Anybody do this before, any
schematic?

Thanks.

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

[Tauno Voipio]

On 3.2.13 10:55 , Phil Hobbs wrote:

Of course, in Finland sausage is considered a vegetable.

Cheers

Phil Hobbs

Yep. The leading brand is HK Blue.

But it is damn good when roasted on a stick like
marshmallows in the big West.

--

-Tauno

 

[Tauno Voipio]

On 3.2.13 8:37 , Jim Thompson wrote:

On Sun, 03 Feb 2013 19:45:50 +0200, Tauno Voipio
tauno.voipio@notused.fi.invalid> wrote:

On 3.2.13 5:36 , Akarsha Mishra wrote:
i want to know how to make traffic light using sensors


Homework?

(Mailed from an Indian GPRS account)

XX gmail XX

...Jim Thompson

You did not dig the header far enough. There
is the original IP, which can be traced.

--

-T.

 

[Jasen Betts]

On 2013-01-31, Paul Hovnanian P.E. <paul@hovnanian.com> wrote:

TO-92 package

markings:

"650"
"B24"

I've got dozens of them. Wondering if I can use them for anything.

possibly BC650B (natsemi)

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

On Sun, 03 Feb 2013 20:38:58 -0800, josephkk
<joseph_barrett@sbcglobal.net> wrote:

For larger LED panels it would be mechanically feasible to use
multiple constant current generators with separate strings with two or
more of those standard currents through the sockets. The panels would
only have pins for the required current and the socket would short
circuit the unused current lines, maintaining loop continuity. Some
open/short circuit detection at each constant current source could
take out unused current loops.

Interesting idea. Been used before, in many locations around the world
series street lighting has been used. There would be a high voltage
constant current transformer sourcing many luminaries along the roadway.

Series street lights have been used since the 1880's. In one
Thomson-Houston system about 30 arc lamps were connected in series and
powered by a 10 kW 1500 Vdc dynamo. The nominal loop current was 6 A,
so each lamp consumed 300 W, but due to the low efficiency (only a few
lm/W), not much light was produced.

What i am not clear on is just how the rest of the string continued when
any single luminaire failed.

Carbon arc lights needs constant electrode adjustment done with
electromagnets. These electromagnets were involved in starting the
lamp as at least some cases also bypassed failed lamps.

 

[Jasen Betts]

On 2013-02-03, miso <miso@sushi.com> wrote:

On 2/2/2013 11:03 PM, Phil Allison wrote:
"miso"

** The heading applies to fuckwit scumbags like you too.

ASD fucked, trolling morons have no right to live.

You need a bullet.




You might want to verify your gun is in good working order before coming
after me. Load the clip, insert it into the gun, put it in your mouth,
then pull the trigger.

click.

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

[MrTallyman]

On 4 Feb 2013 09:13:05 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:

On 2013-02-03, miso <miso@sushi.com> wrote:
On 2/2/2013 11:03 PM, Phil Allison wrote:
"miso"

** The heading applies to fuckwit scumbags like you too.

ASD fucked, trolling morons have no right to live.

You need a bullet.




You might want to verify your gun is in good working order before coming
after me. Load the clip, insert it into the gun, put it in your mouth,
then pull the trigger.

click.

Yeah... he would need to give more complete instructions, eh?

 

[Martin Brown]

On 01/02/2013 17:39, krw@attt.bizz wrote:

On Fri, 01 Feb 2013 08:13:05 +0000, Martin Brown
|||newspam|||@nezumi.demon.co.uk> wrote:

On 01/02/2013 06:06, josephkk wrote:

I think what makes this interesting is that two people did this sans
electronics; or maybe not (it could have been done electronically). If i
knew which track(s) i would love to listen to it for that property.

?-)

I don't think they did. At least put it this way the gear existed by
then to do vocoder and other sophisticated voice modulation tricks.

I am fairly convinced that most of it is down to clever post production
electronic sound engineering with then state of the art gear. If you
want to decide for your self try the album Arrival 1977 which sparkles
whereas their live performances at the time were described as "Boring".

I wonder if Manhattan Transfer didn't use some of the same techniques.
I'm told their live performances are "flat" or "muddled", though it
could have just been the acoustics in the theater.

...

Don't know - they were kind of US retro 1920-30's music with a big hit

in the UK with Chanson d'Amour and few others after that. AFAIK They are
not obviously connected with the Wall of Sound studio techniques.

Although they were in the same scene as various electronica artists like
Donna Summer so anything is possible.

--
Regards,
Martin Brown

 

[Jeff Liebermann]

On Sun, 03 Feb 2013 16:46:30 -0700, hamilton <hamilton@nothere.com>
wrote:

But, that would be traffic lights in India, right ?
Anyone know about traffic lights in India ?

Nope, but Google to the rescue:
<https://www.google.com/search?tbm=isch&q=india+traffic>
A picture is worth a kiloword.
I think there may be a traffic signal in there somewhere, maybe.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Robert Macy]

On Feb 3, 10:03 am, "trad...@optonline.net" <trad...@optonline.net>
wrote:

On Feb 3, 10:03 am, Robert Macy <robert.a.m...@gmail.com> wrote:
..snip...
Many motion sensors are for security, THEREFORE the designer purposely
takes some care to NOT relate the detection to the motion.

That would appear to be a non-sequitor.  And directly
contradicted by how the typical security motion sensor
works.   You can stand in front of it all day as long as
you don't move.  Wave your arm and it triggers.

What I was mentioning is that today, what used to be a security
function - motion sensor, has become a 'courtesy' function - turning
on walk lights for guests etc. Your description is accurate. It is
like an AC coupled response.

What I was talking about was disabling the ability of an intentional
intruder from 'testing' the sensor early. Walking the space, finding
range, sensitivity to motion, etc. IF the sensor has immediate
response, is easy. IF sensor has a delayed or weird response time, is
very difficult to correlate the activity to the sensor's response.

 

[Robert Macy]

On Feb 3, 10:13 am, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

Robert Macy wrote:

Many motion sensors are for security, THEREFORE the designer purposely
takes some care to NOT relate the detection to the motion. For
example, sometimes delay detection before alarm. When I worked at a
Security Electronics firm, we used to not simply watch for a level of
signal, but look at the pattern - trying to decide whether the
intruder was an animal, like a dog, or was a person.  Because, most of
where our systems were used a false positive called out the guards big
time.

Some sensor technologies simply take time to 'decide' if there has
been an intrusion. Many on the market today are for 'courtesy' like
lighting a walkway, so immediate, or related to detection, is a real
'don't care.'

With that said, you're going to have to get some sensors and go
'upstream'  to the analog signal and look for it.  IR detectors, sonic
detectors, and radar detectors offer you the best hope with sonic and
radar probably being the most appropriate for what you described you
want to do.

Then to transfer the signal level to intensity, use a modified dimmer
switch.

You'll still have to cut into everything, but you won't have too much
fuss and design effort to mess with.

   A microwave sensor with a F/V converter & the input signal would let
him have amplitute & speed.  Doppler RADAR measure the frequency
difference from the transmitted signal by mixing the echo with the
transmitted RF.  You have to filter the phase noise for best perfomance,
but just selecting the right capacitor for capacitive coupling into the
amp will limit the LF response.  The amplitude will give you distance,
the frequency change will show the speed of the target.  You can use the
signals seperatly, or mix them for whatever result you want.

   You can get the doppler microwave module for $7 and add the rest.

http://www.ebay.com/itm/360556310119

I agree that he has the highest potential of success using microwave,
or such. But what you describe is usually AC coupled output and you're
back to standing still not showing up. You could DC couple the
detector, 'remember' the level coming out when nothing is there, and
simply go from there, with a cheap ADC and map back into a DAC that
runs the lighting.

 

[Joerg]

Tauno Voipio wrote:

On 3.2.13 10:55 , Phil Hobbs wrote:

Of course, in Finland sausage is considered a vegetable.

Cheers

Phil Hobbs


Yep. The leading brand is HK Blue.

But it is damn good when roasted on a stick like
marshmallows in the big West.

Have you ever tried Johnsonville Brats? (Bratwurst). Roasted over a wood
fire, outdoors, yumm. I could eat 3-4 in a row but of course that's not
healthy so I restrict myself to one.

Nothing better than standing around the fire with a beer in hand,
discussing politics, cars and football

--
Regards, Joerg

http://www.analogconsultants.com/

 

[George Herold]

On Feb 3, 10:36 am, Akarsha Mishra <mishraprowess.akar...@gmail.com>
wrote:

i want to know how to make traffic light using sensors

Grin... It pretty hard to make light from most sensors. You'll have a
much easier time making a traffic light using 'lights'. :^)

George H.

 

On Mon, 04 Feb 2013 10:06:05 +0000, Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:

On 01/02/2013 17:39, krw@attt.bizz wrote:
On Fri, 01 Feb 2013 08:13:05 +0000, Martin Brown
|||newspam|||@nezumi.demon.co.uk> wrote:

On 01/02/2013 06:06, josephkk wrote:

I think what makes this interesting is that two people did this sans
electronics; or maybe not (it could have been done electronically). If i
knew which track(s) i would love to listen to it for that property.

?-)

I don't think they did. At least put it this way the gear existed by
then to do vocoder and other sophisticated voice modulation tricks.

I am fairly convinced that most of it is down to clever post production
electronic sound engineering with then state of the art gear. If you
want to decide for your self try the album Arrival 1977 which sparkles
whereas their live performances at the time were described as "Boring".

I wonder if Manhattan Transfer didn't use some of the same techniques.
I'm told their live performances are "flat" or "muddled", though it
could have just been the acoustics in the theater.

...

Don't know - they were kind of US retro 1920-30's music with a big hit
in the UK with Chanson d'Amour and few others after that. AFAIK They are
not obviously connected with the Wall of Sound studio techniques.

They do more than 20s-30s. Each album/CD was rather a different
style. Their biggest attributes were their crisp enunciation and
absolute synchronization, which brought them to mind in this
discussion. I've been told it didn't go over well live, perhaps
because there was no back-room editing. Though their "live" albums
were good, "live" doesn't preclude a lot of fiddling in the studio.

Although they were in the same scene as various electronica artists like
Donna Summer so anything is possible.

 

[Robert Macy]

On Feb 3, 8:17 am, mzen...@eskimo.com (Mark Zenier) wrote:

In article <keku69$6s...@dont-email.me>,

Tim Williams <tmoran...@charter.net> wrote:
AFAIK, pyroelectric sensors are a "single pixel" sort of thing, so they
don't know if the scene is moving, only if the average IR changes.  Which it
does when someone comes into view or jumps out of the shadows, but it
doesn't do jack if someone walks around freely while holding up a
room-temperature blanket, or moves in the scene while presenting an equal
viewing cross section (probably tricky to do).

They're two "pixels" in an AC coupled  differential circuit.
The optics are set so that the sensors see adjacent areas and
react to fast changes.  (You can fool them if you move real slow).

The best analogy of the optics is to spread your fingers apart and put the
flat of your palms together so that the fingers interleave.  One sensor
per "hand", with the views of the two sensors interlinked.  Any movement
quick enough, and one sensor will decrease while the other increases.
The response is usually flat in one plane, determined by the way the
plastic lens is molded.

Radio-Electronics/Electronic Now magazine had a long distance pyroelectric
sensor project that used a motor driven mechanical chopper, back when
these things were new.

Mark Zenier  mzen...@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)

If you're going mechanical, why not make it a capacitive sensor.
Chopping the field from the intruder. Since you kknow the speed of the
chopping, you can synchronously detect and obtain EXACTLY the type of
signal you want. ...I think.

 

[John Larkin]

On Mon, 04 Feb 2013 12:22:40 +1300, Gib Bogle <g.bogle@auckland.ac.nz>
wrote:

On 3/02/2013 4:28 a.m., John Larkin wrote:


Audio is such nonsense.



There is good comedy value in some of the hifi mags.

Years ago I read about a very conscientious speaker designer in the UK
who had the goal of making a good cheap speaker. He came up with a good
design, but couldn't sell them. Finally (on advice) he had to resort to
pushing the selling price up significantly, then they started selling.
He was quite discouraged by this experience, while for others, of
course, it represented a commercial opportunity.

In the first .com boom, local restaurants discovered that the more
they charged for a bottle of wine, the more they sold. Restaurants
like Boulevard had several wines in the $1000 to $3000 range.

Beer is the new wine, and The Monks Kettle usually has something in
the $80 range.


--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation

 

[John Larkin]

On Sun, 03 Feb 2013 21:00:44 -0500, Uncle Steve <stevet810@gmail.com>
wrote:

More than a century has passed since science laid down sound
propositions as to the origins of the universe, but how many have
mastered them or possess the really scientific spirit of criticism? A
few thousands at the outside, who are lost in the midst of hundreds of
millions still steeped in prejudices and superstitions worthy of
savages, who are consequently ever ready to serve as puppets for
religious impostors. -- Peter Kropotkin

Cool. What is the origin of the universe?


--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation