Da lil ally 7" lilliput project

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#81
hi fuzzyman,

that's the same lamp i use.
it'll run with same ballast as for the osram hqi 150 T or 150 TS and equals (philips cdmt-150 a.s.o.)
do you have any shops or webshops around supply lighting for fish tanks? usually they have this stuff.
ignitor should meet the requierments of the bulb.....ignition voltage of 4 to 5 kilovolts.
and then, try to get an old overhead projector. all the parts e.g. fresnel, reflector, kondensor and lens are contained in an ohp.

cu.
 
#82
Hi IEF

What materials are Fresnels made from ? You mentioned these parts are available from a normal OHP. Another pj project site indicates that you can use a second fresnel as a condensor.

Excuse my ignorance, but I don't know much about optics. What do you think about using two fresnels instead of one. Their design shows two fresnels, facing opposite directions, back to back, between the lamp and the LCD.
 
#83
@fuzzyman,

the fresnels used in ohp's made from polycarbonate.this consists of two frenels-sheets with the grooves face to face.
the magnifier sheets mostly of cheap pvc.

all ppl here using two fresnels. the difference is the setup.
either splitted or non splitted.
in my setup i haven't split it. so that's why u think i am using just one.

go on reading the faq's. that'll help alot to learn about optics. then u'll understand how it works.
 
#84
Daewoo Specifications

Hi All

Does anyone know where I could lookup technical specifications for Daewoo In-Car LCD screens. These are the 6" and 7" units sold locally, but I have been unsuccessful in finding specifications for the LCDs.

Thanx in advance.
 
#86
Daewoo Specifications - found

Hi All

The site owner updated the site, and now included the specs of the LCDs. Will the 5-inch work ? It's half the price of the 7-inch.


An externally hosted image should be here but it was not working when we last tested it.


Daewoo DW-LH700

7" Wide Screen (16:9)
2 Video Input Selection
On Screen Display Function
Stand-Alone/Headrest Type
Wide Angle Viewing
Space Saving
High Resolution
Resolution - 800x480 = 1.152.000 Dots
Active Size - 152x91
Image Function - 16:9, 4:3, Zoom

An externally hosted image should be here but it was not working when we last tested it.


Daewoo DW-LH500

5" Digital LCD wide angle
Game Function
Multi - System
AV Input
Remote/Earphones and charger
Audio - 200mw
12V
Outer Dimension - 163x125x30.5mm
Weight - 430g
Dot Pitch - 0.107x0.319
Resolution - 960x234
Contrast - 150:1
Viewing Angle - 15x35x50
 
#92
The_Mazta said:
Metal halogen bulb HQI TS 400W Daylight

Color temperature: 5100 Kelvin Daylight

Lumen: 36000

UV STOP BUILT IN

Dimensions lamp: a=81.5mm; d=25mm; l=163mm

Dimensions fluorescent lamp ballast: 85x100x70mm LxBxH (somewhat larger with 400W)
Click to expand...

Thanks for the offer, but I'm not in a position to purchase anything as yet. I'm still sourcing parts locally, and will then assess what the total cost will be and make a final decision.

At the moment I'm trying to read up on UV filters and what type I can use with the Osram HTI bulb. Does anyone know what type of heat these bulbs give off ? My eventual box design will have to accomodate the necessary cooling.
 
#95
hey fuzzyman,

all kinda glass blocks UV. have ya ever heard of a person "sun burnt behind a window"? lol.

anyway, i've made some nu picters w my crappy cam in the dusk just to show how brite a 152 HTI lamp is. i had no tripod, so i had a shaky hand. in reality it is abit brighter. i made no correction on the pics but compression.


An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
#96
I_eat_flowers said:
hey fuzzyman,

all kinda glass blocks UV. have ya ever heard of a person "sun burnt behind a window"? lol.
Click to expand...

Firstly, my apologies for the delayed response.

Does this mean that I can use one or two normal pieces of glass in front of the bulb to block the UV ?

I've been unsuccessful in finding a local supplier of UV protection that can withstand high temperatures. I can't remember if I've asked this already, but is there any place I can lookup what the external operating temperature is of the bulb. I want to know how much heat the bulb generates.

regards

Gary
 
#97
Hi I_EAT_FLOWER, got to say SUPERB RESULT.
Have you tried using your computer and try to focus the corners using any image or better use NOKIA monitor test. Do you have the same problem I'm having ? I cannot get the corners to focused. Only the center area. Thanks.
 
#98
fuzzyman said:


Firstly, my apologies for the delayed response.

Does this mean that I can use one or two normal pieces of glass in front of the bulb to block the UV ?

I've been unsuccessful in finding a local supplier of UV protection that can withstand high temperatures. I can't remember if I've asked this already, but is there any place I can lookup what the external operating temperature is of the bulb. I want to know how much heat the bulb generates.

regards

Gary
Click to expand...

hi fuzzyman,

yeah, u can use ordinary glass oer better safety glass. it's made from two slices of glass and a foil between it like a car windshield glass. it is not unnecsessarily needed to put it in front of the bulb.
cut it abit bigger and then you'll have a separate light chamber holds the heat in. so the glass will keep away the panel from the heat and you don't need high temp glass. look, in front or near the bulb the temperature is about 300° C ( acording to datasheets). so put the glass away as described.

hope this helps.
ief
 
#99
dewil said:
Hi I_EAT_FLOWER, got to say SUPERB RESULT.
Have you tried using your computer and try to focus the corners using any image or better use NOKIA monitor test. Do you have the same problem I'm having ? I cannot get the corners to focused. Only the center area. Thanks.
Click to expand...

thx for the nice words dude.

yes, i have used my pc and got sharp images too. my setup is different. i have a unsplit set-up. I know ya problem and i am abit confused. maybe ace is right, but after all of his advices you still have a "no go". so try another lens with a longer fl of 340-350mm.
by means of a spectacle glass you can prolong the fl. a glass of minus 0.25 diopter prolongs your fl to 347 mm. maybe you can get it at a local optician. put this glass on the panel side of your objective. of course, then you have to focus is again, but i am convinced that this will help definetely.

ief
 
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