NEW projector from INDIA

[jaudere]

badepapa,

see the thickness of your lens. my single fres is 2 mm thick while
a fused fres is around 4 mm( standard measurements).

my LCD monitor is Miyota: 6" diagonal.

cost rs 2800 without receipt from lamington road.

No VGA input. will try to find whether there is anything like VGA to RCA cord. i don't know whether such thing exists or no but i have found too many things at lamington road which i had not imagined.

wanted to keep my project a low cost one as this is my first project and i am not a person trained in electronics or electricals. so got LCD with minimum possible cost.

i have spent rs 6800 in total till now (1800 on LEDs, 2800 on LCD, 2000 on lenses , 400 in stationary, travel etc).

[jaudere]

amit,
you can call lensel on phone. it is given on their website.

i am originally from pune. so i went personally to Lensel when i visited home. tremendous reduction in cost. they ship the lenses anywher in India for rs 3000. i got them for rs 1810 inclusive of VAT.spent 150 rs on petrol to reach lensel.
i also got the lenses cut to required size from lensel only. if you tell them in advance about the size you need, they will cut it for you .

how much did the fresnel + triplet cost you?

[badepapa]

Hi Doctor,

The lens I have is around 5mm thick. I don't care about it now as I am getting the required projection .

I am in Noida and got the lenses from a local dealer of OHP spares in Delhi. The cost of fresnel is Rs 650 /=. I am not using a Triplet as I did not get one . I am using a singlet used in OHP's, but its good enug to start of. Will replace it wid triplet when I find one. Its not possible for me to go to Pune for lenses. Will try to find some friend in Pune to get the triplet for me.

Regarding the VGA to RC conversion, there are these converters available in market on any computer shop. These are very common, just tell them that you want to connect your PC to your TV.

Keep us posted on your progress.
Good Luck

Amit

[jaudere]

you got the lenses at absolutely right price.

lensel sells OHP fresnel for 650+ taxes and single fresnl for 325+ taxes.

triplet is for rs 960+ taxes. so if your dealer is giving lenses at that cost, go for him.

there are many OHP manufacturers in ( i don't exactly remember) i think amritsar. what you acn do is go to alibaba.com and put search for OHP manufacturers in India. you will get their contact information. those people respond within a day.

may be they can provide you with triplet.

i am building box for my final projector in 25mm thick thermocol.
i can do that as LEd panel is extremely lighwt. and i don't need fans either. if this does not work, i will have to go to carpenter.


got something called fogged glass. will see what happens if i put it before LCd instead of fres1. will try to use the LCd CFL as well to improve brightness.
vikram

[jaudere]

my projector started working.
but had too many problms basically because of using thermocol.
will have to go to carpenter. anyway now i exactly know what design i need.

could not get good snaps.

[fibbrilator]

Originally posted by jaudere


hi,

still unable to use jpeg compression (there was no such option) and zipping is reducing size by just 10kb.very odd.
please tell me the method in detail so that i can send images.

another odd thing. just see the distances i have to use to get best image( 20x at 10 feet)

LED panel to Fres 1 (343mm FL): 28 cm

fres1 to LCD: kept in touch with each other

fres1 to fres 2 (216mm FL): 12 cm

fres2 to triplet: have to keep in touch with each other to get best image

you might think that i am doing something wrong. but i think you will accept it if you see the images. another thing is that i am using LEDs. i don't know whether that is making the difference.

Sorry for the late reply. I out of town.

Don't use the fresnel between the LED panel and LCD. distance between LED panel and LCD should be around 1 to 2 CM. use a fresnel around 300 mm between LCD and triplet.That fresnel should be around 2 cm from the LCD and around 300 mm from triplet.

Down load PICCASA software from google it is free. choose the image you want, use the export option. A dialogue will pop up where you can adjust the JPEG compression and adjust resolution.Keep experimenting till you get a good image under 100 kb

[jaudere]

gitesh,

did you see the first image that i have sent? i took it with keeping LED panel behind OHP slide( i was using OHP slide in place of LCD) and without using fres behind slide.. you can see the grid problem there(ultiple dots corresponding to each LED).
tried frosted glass to correct that problem but no use.



i tried to project LCDyesterday. watched 3-4 songs.

the best distance were
LED to fres 1: 28cm, Fres1 and LCD in contact.
fres1 to fres 2 :12 cm and fres2 to triplet 12 cm.

learned few things.

1) my final box has to be wooden. thermocol cannot hold assembly for long and i could not cut it precisely.

2)LEDs will work but 100 is not enough( may be because i am keeping the LED and LCd 28 cm apart). peple had warned me about this but i wanted to experiment.

3) i must use white screen.i projected the pict on wall which is light green coloured.

4) i have find menas to improve brightness.
may be by i) reducing the distence between LEDs and LCD ii)removing anltiglare film if possible iii) adding two 20 watt CFLs.

lets see

[fibbrilator]

>>> I predicted this would happen.Thats why I told to use 5 mm LED so the light will be more uniform.When you use 10mm LED brightness will be much less in the perimeter of each LED hence you get the uneven Grid pattern

>>> There is absolutely no point in using Fresnel between led and LCD.It is very very inefficient. The Fresnel expects a point light source like the inner bulb in the metal halide lamp. Now most of the light that is projected will be coming from a couple of led's from center of the LED panel.So IF you are using LED 's and need a bright projection don't use the fresnel.

>>> I suggest that you use a metal halide lamp with fresnel or make an LED panel with closely spaced 5 mm LED's to get good results.5 mm white LED's are available for 1.5 RS in Bangalore minimum quantity 250. Even if the lumen out put is a bit less it may be compensated as the no of LED is more.

>>>Removing anti glare will not help much It is also very risky .

Good luck ,keep experimenting.

[jaudere]

i do remember you had warned me.

i used a distance of 28 cm bet LEds and LCD. may be that is ONE of the reasons.

there are many varieties of 5 mm LEDs. the brightest were 22000mcd and the cost was rs 16 each in a reliable shop. what is the mcd value of those rs 1.5 LEDs

i tried removing the fres between LEds and LCD but somehow it reduces the brightness. will try again.


LEDs did not fail completely. and i am not getting the grid problem.
just the brightness was lower(will say it was not poor but it was average.anyway taht is subjective perception)

pushing up the brightness will do the trick and i am going to add cheapest, easiest source which was my second option. The CFLs.

got 2 30watt CFLs today.
will give me additional 3500 lumens when put together.
if even that does not work, of course MH is the trusted source. but i will never learn without experimenting.( basically went for LEds because i saw someone being successful with it and i do not regret it).

[peterson35]

Today I've ordered my fresnel lens i.e dual focus heat merged twin fresnel lens and 74mm 285 mmFL triplet with Lensel Optics, Pune. I think they will arrive in a week.

Than I'll start a test rig and then work on making the box for the projector.

Keep posted about the improvements