Chip with simple program for Toy

[John Larkin]

On Mon, 5 Aug 2013 18:38:26 +1000, "Phil Allison" <phil_a@tpg.com.au> wrote:

"Zephod Beeblebrox"

Sound travels at 1,126 fps

This is why I have a delay unit attached to my sound sensor.

All I need now is a faster flash. The fastest I have goes to 1/38,000th of
a second.


** You have only the slimmest chance of success and none at all with your
present approach.

I decided to Google the famous Edgerton "Microflash" device from the 1960s.

http://quickblink.com/2011/07/egg-microflash/

It produced an arc in air with few Joules being dumped in a microsecond or
two - with *just* enough light output for a film camera (with decent lens
and 200 ASA colour film) ) to catch a pic.

Modern digital cameras are far more light sensitive and do not suffer from "
repricosity failure" like film does with very short exposure . So - IF you
can concentrate the light from your 170 LEDs on a small area, get the slug
in that area and snap it - you may get something usable.

Forget sound triggering and go for a physical switch - like a pair of
close spaced metal foils the slug simply shorts together as it passes
through them.

This event can trigger the gate of an SCR to dump a charged capacitor into
the LED array with a very small delay and a current pulse duration in the
order of 10 microseconds.

The camera lens needs to be close too - like 50 mm away.

Guessing that a regular white 5mm LED can stand a single 10uS pulse of 200mA
once in a while - your peak current is 34 amps. So the load resistance is
gonna be in the order of 5/34 = 0.15 ohms.

For a time constant of 10uS, that equates to using a cap of 6.8uF - it has
to a metallised film type for low ESR .

6.8uF and 0.15 ohms is a tau of 1 usec.

A 6.8u cap charged to 5 volts stores only 85 microjoules, of which a fraction
drives the actual LED junctions.

Building a spark gap would be more fun, and is about three or four orders of
magnitude better on delivered light.




--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators

 

[Zephod Beeblebrox]

LOL OK...

I'll get back to my spark gap flash project...

I am going to have to put it in some kind of housing to protect me from the high voltages. I don't want to be the next piece of fried bacon.

I am concerned about 3 things with a spark-gap flash...

1. EMP - how much EMP is it likely to put out?
2. Radiation - how much ionizing radiation is it likely to put out?
3. RF interference - I live close to an airport - I don't want to piss people off by creating blips on their systems.

I suppose the answer to 3 is a Faraday cage. 1 and 2 are of great concern however.

I have done some small experiments already. I have a car ignition coil and I ran a 110v - 12v AC transformer through it and produced a teeny little spark that's not really worthy of mention. I suspect the 40/50hz of mains electricity is too slow.

Really and truly I probably bought the wrong kind of coil. I think I should have bought a Model T vibrating coil. That way I can go straight from 12v to a decent spark.

 

[Jeff Layman]

On 05/08/2013 09:38, Phil Allison wrote:

Modern digital cameras are far more light sensitive and do not suffer from "
repricosity failure" like film does with very short exposure .

For those interested in looking it up, that should be "Reciprocity
failure", and it happens with very long exposures, not very short ones.

--

Jeff

 

[Phil Allison]

"Jeff Layman"
Phil Allison wrote:

Modern digital cameras are far more light sensitive and do not suffer
from "
repricosity failure" like film does with very short exposure .

For those interested in looking it up, that should be "Reciprocity
failure", and it happens with very long exposures, not very short ones.

** It happens with both - dickhead.

http://en.wikipedia.org/wiki/Reciprocity_(photography)

" Reciprocity also breaks down at extremely high levels of illumination with
very short exposures. This is a concern for scientific and technical
photography, but rarely to general photographers, as exposures significantly
shorter than a millisecond are only required for subjects such as explosions
and particle physics experiments, or when taking high-speed motion pictures
with very high shutter speeds (1/10,000 sec or faster). "


.... Phil

 

[Zephod Beeblebrox]

Wikipedia is not an accurate source of information.

Reciprosity failure happens when film is used beyond its normal limits. All it means is that for ultra long exposures and ultra short exposures, it does not perform within expected parameters.

To get around this, astronomers cool film with liquid hydrogen to gain sensitivity during long exposures.

 

[Phil Hobbs]

On 08/05/2013 04:17 PM, Jeff Layman wrote:

On 05/08/2013 09:38, Phil Allison wrote:

Modern digital cameras are far more light sensitive and do not suffer
from "
repricosity failure" like film does with very short exposure .

For those interested in looking it up, that should be "Reciprocity
failure", and it happens with very long exposures, not very short ones.

About a dozen years ago, reciprocity failure was essentially completely
solved by Belloni et al. (Nature 402, P. 865). They added formate ions
to ordinary silver halide emulsions, and got essentially unit quantum
efficiency and a photoelectron gain of 2 (i.e. 2 grains exposed per
electron-hole pair).

The effect works at room temperature and is stable with time, unlike
previous hypersensitization tricks.

Pity it wasn't discovered till it no longer mattered.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[Zephod Beeblebrox]

I gather the best films were not silver halide nor silver iodide but platinum halide. Clearly platinum was too expensive though.

I suspect that though film is still used, it will rapidly lose favor as digital systems become ever cheaper. I really like the digital xrays dentists use.

 

[Fred Abse]

On Tue, 06 Aug 2013 11:22:11 +1000, Phil Allison wrote:

" Reciprocity also breaks down at extremely high levels of illumination
with very short exposures. This is a concern for scientific and technical
photography, but rarely to general photographers, as exposures
significantly shorter than a millisecond are only required for subjects
such as explosions and particle physics experiments, or when taking
high-speed motion pictures with very high shutter speeds (1/10,000 sec or
faster). "

There's an effect associated with reciprocity failure called
"solarization", where the characteristic curve (H&D curve) bends
downwards, and increasing exposure in that region results in a reduction
in density of the negative.

--
"Design is the reverse of analysis"
(R.D. Middlebrook)

 

[John Larkin]

On Mon, 5 Aug 2013 10:25:42 -0700 (PDT), Zephod Beeblebrox
<sagephotoworld@gmail.com> wrote:

LOL OK...

I'll get back to my spark gap flash project...

I am going to have to put it in some kind of housing to protect me from the high voltages. I don't want to be the next piece of fried bacon.

I am concerned about 3 things with a spark-gap flash...

1. EMP - how much EMP is it likely to put out?
2. Radiation - how much ionizing radiation is it likely to put out?
3. RF interference - I live close to an airport - I don't want to piss people off by creating blips on their systems.

I suppose the answer to 3 is a Faraday cage. 1 and 2 are of great concern however.

I have done some small experiments already. I have a car ignition coil and I ran a 110v - 12v AC transformer through it and produced a teeny little spark that's not really worthy of mention. I suspect the 40/50hz of mains electricity is too slow.

Really and truly I probably bought the wrong kind of coil. I think I should have bought a Model T vibrating coil. That way I can go straight from 12v to a decent spark.

If you don't do the math, you won't get any pictures.

A car ignition coil will make a slow spark with 10s of millijoules of
energy.


--

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

 

[Phil Hobbs]

On 08/06/2013 02:56 PM, Fred Abse wrote:

On Tue, 06 Aug 2013 11:22:11 +1000, Phil Allison wrote:

" Reciprocity also breaks down at extremely high levels of illumination
with very short exposures. This is a concern for scientific and technical
photography, but rarely to general photographers, as exposures
significantly shorter than a millisecond are only required for subjects
such as explosions and particle physics experiments, or when taking
high-speed motion pictures with very high shutter speeds (1/10,000 sec or
faster). "

There's an effect associated with reciprocity failure called
"solarization", where the characteristic curve (H&D curve) bends
downwards, and increasing exposure in that region results in a reduction
in density of the negative.

Solarizing prints is usually done in the developer bath, though, so it
isn't quite the same thing as reciprocity failure.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[Fred Abse]

On Wed, 07 Aug 2013 13:48:01 -0400, Phil Hobbs wrote:

On 08/06/2013 02:56 PM, Fred Abse wrote:
On Tue, 06 Aug 2013 11:22:11 +1000, Phil Allison wrote:

" Reciprocity also breaks down at extremely high levels of illumination
with very short exposures. This is a concern for scientific and
technical photography, but rarely to general photographers, as
exposures significantly shorter than a millisecond are only required
for subjects such as explosions and particle physics experiments, or
when taking high-speed motion pictures with very high shutter speeds
(1/10,000 sec or faster). "

There's an effect associated with reciprocity failure called
"solarization", where the characteristic curve (H&D curve) bends
downwards, and increasing exposure in that region results in a reduction
in density of the negative.


Solarizing prints is usually done in the developer bath, though, so it
isn't quite the same thing as reciprocity failure.

Different thing. "Solarization region". Not deliberate, but an effect
of overexposure going right over the top of the S-shaped characteristic
curve. and down the other side. First described, I believe, by Hurter and
Driffield, around the turn of the 19th century.

Not prints, but negatives. Used to be regarded as a fault, but I suppose
the arty-farty types will have latched on to it.


--
"Design is the reverse of analysis"
(R.D. Middlebrook)

 

[whit3rd]

On Tuesday, August 6, 2013 9:10:34 AM UTC-7, Zephod Beeblebrox wrote:

I gather the best films were not silver halide nor silver iodide but platinum halide. Clearly platinum was too expensive though.

It is possible to treat prints with either chromium or platinum to increase the
contrast or (with platinum) to increase the dynamic range of the image.
If memory serves, the negative wasn't platinum, just the print.

 

[_defaullt]

On Sat, 3 Aug 2013 17:58:07 -0700 (PDT), Zephod Beeblebrox
<sagephotoworld@gmail.com> wrote:

mylar capacitors

See how some of the Tesla coil folks do it. Multiple series parallel
film caps, roll your own polyethylene/polypropylene/Teflon caps, glass
or mica plate caps.

I even made some using Corelle dinner plates as insulators.

Not all that more bulky than commercial units made with the same
materials, but yes, it is bulky. Does it have to be battery powered
and portable too?

Rectification could be handled by some of the old CRT color TV parts.
They are still in good supply and not all that expensive if you shop
around for surplus.

And Bragging Rights? Big warning signs, knife switches, moving iron
meters, transformers humming along, polished brass anti corona balls,
turret ceramic insulators; what's not to like?

 

[Mr. Man-wai Chang]

From Google Translate:

The following are the services provided by the university to direct
education students at the University of Malaysia:

1. Securing visas to study in Malaysia for direct education students.
2. Student reception at the airport when he came for the first time to
Malaysia.
3. Help the student to get adequate housing when you desire it, due to
the unavailability of housing belonging to the University now.
4. Performing procedures to obtain adhesive (residence) of the student
after his arrival in Malaysia.
5. Renewal of student visa (residence) annually.
6. Estimated student facilities to send an invitation to him (the wife.
Son. Brother. Motherland. Sister. Etc..
7. Providing various extra-curricular activities (such as contests,
seminars, religious and cultural activities, social and sports, etc.).
8. Take advantage of the paper are available at the university library
in addition to the electronic library.
9. Provide computer laboratories for scientific research, and the
wireless network (Wi-Fi) on campus.
10. Provide guidance for new students to Insjmoa with scientific and
social life in Malaysia.
11. Academic counseling for students.
12. Issuance of health insurance for students.

Greetings International City University of Malaysia
http://mediu.edu.my/

On 15/08/2013 1:39 PM, Ihabmahmoud Mediu wrote:

فيما يلي الخدمات التي تقدمها الجامعة لطلاب التعليم المباشر بمقر الجامعة بماليزيا

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 19 i686) Linux 3.10.5-201.fc19.i686
^ ^ 17:33:01 up 4 days 13:23 0 users load average: 0.00 0.02 0.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Mr. Man-wai Chang]

Pressed <send> too early... Sorry!

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 19 i686) Linux 3.10.5-201.fc19.i686
^ ^ 17:33:01 up 4 days 13:23 0 users load average: 0.00 0.02 0.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[JW]

On Thu, 15 Aug 2013 17:41:44 +0800 "Mr. Man-wai Chang"
<toylet.toylet@gmail.com> wrote in Message id:
<kui7om$pq7$1@dont-email.me>:

From Google Translate:

I've been reading Usenet for over 15 years. You're the first idiot I've
ever seen who actually translated spam.


Please use the Think-Then-Post method in future. TIA.

On 15/08/2013 1:39 PM, Ihabmahmoud Mediu wrote:
???? ??? ??????? ???? ?????? ??????? ????? ??????? ??????? ???? ??????? ????????

 

[Mr. Man-wai Chang]

I've been reading Usenet for over 15 years. You're the first idiot I've
ever seen who actually translated spam.
Please use the Think-Then-Post method in future. TIA.

I just cut-and-pasted the content into Google Translate!

Yes, I possibly had too much time...

Too bad the content was not about electronics.

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 19 i686) Linux 3.10.6-200.fc19.i686
^ ^ 19:18:02 up 1:24 0 users load average: 0.00 0.03 0.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[JW]

On Thu, 15 Aug 2013 19:28:55 +0800 "Mr. Man-wai Chang"
<toylet.toylet@gmail.com> wrote in Message id:
<kuie1l$k6r$1@dont-email.me>:

I've been reading Usenet for over 15 years. You're the first idiot I've
ever seen who actually translated spam.
Please use the Think-Then-Post method in future. TIA.


I just cut-and-pasted the content into Google Translate!

And then posted it anyway when any sub-moron could see it was spam.

>Yes, I possibly had too much time...

Do you have a special disability which renders you dull and witless? If
you can't understand that question, then please just look down and tell me
if you see a big drool stain on the front of your shirt. You know, your
shirt; that's the thing your mommy puts on you in the morning. You know,
your mommy; she's the nice lady that makes you blush every time she walks
by in a housecoat.

Fuckstain.

>Too bad the content was not about electronics.

Right up your alley, then. Check.

 

[Mr. Man-wai Chang]

On 15/08/2013 7:36 PM, JW wrote:

Do you have a special disability which renders you dull and witless? If
you can't understand that question, then please just look down and tell me
if you see a big drool stain on the front of your shirt. You know, your
shirt; that's the thing your mommy puts on you in the morning. You know,
your mommy; she's the nice lady that makes you blush every time she walks
by in a housecoat.
Fuckstain.

Get back to your job! Your supervisor is coming...

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 19 i686) Linux 3.10.6-200.fc19.i686
^ ^ 19:33:02 up 1:39 0 users load average: 0.00 0.01 0.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Jim Thompson]

On Thu, 15 Aug 2013 07:36:17 -0400, JW <none@dev.null> wrote:

On Thu, 15 Aug 2013 19:28:55 +0800 "Mr. Man-wai Chang"
toylet.toylet@gmail.com> wrote in Message id:
kuie1l$k6r$1@dont-email.me>:

I've been reading Usenet for over 15 years. You're the first idiot I've
ever seen who actually translated spam.
Please use the Think-Then-Post method in future. TIA.


I just cut-and-pasted the content into Google Translate!

And then posted it anyway when any sub-moron could see it was spam.

Yes, I possibly had too much time...

Do you have a special disability which renders you dull and witless? If
you can't understand that question, then please just look down and tell me
if you see a big drool stain on the front of your shirt. You know, your
shirt; that's the thing your mommy puts on you in the morning. You know,
your mommy; she's the nice lady that makes you blush every time she walks
by in a housecoat.

Fuckstain.

Too bad the content was not about electronics.

Right up your alley, then. Check.

Then why do you reply to "toylet's" posts and give him a forum?

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

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