psone LCD using CRT lens

[rmpmla]

my first to post in diyaudio and thank you for all the infos here in this forum.
been doin lots of adjustment with my box and will share the result as i progress.
here is the image on the LCD

 

[ShinOBIWAN]

Looks fantastic, thanks for the picture!

 

[rmpmla]

parts use:
70 watt MH with enclosure and aluminum reflector.
Redant PSone screen
fresnel and condenser lens from a leisegang OHP
NEC crt projection lens from surplusshed
here is the result

 

[rmpmla]

the whole screen seemed lighted up but i noticed a round bright circle on the middle of the screen.
screen size is around 42" projected on a bedsheet

 

[Gizmotech]

In my test I had the same where there was a brighter circle in the centre. You'll find that this can be rectified by moving the Lamp away from the fresnel a bit more. Sometime try'll and error gives better results than the actual maths. Let me know if I'm correct.

 

[ukagr]

do you have any pictures of your setup, enclosure, pj guts?

 

[rmpmla]

Gizmotech, you are right but it took me quite a while to figure this out as i was concentrating on improving the reflector of the lamp.
the lamp came in with complete fixture, so i used the aluminum reflector that came with it.
the reflector is just a plain aluminum and i eventually replaced it with mirror finished.

 

[rmpmla]

was not able to take picture of the PJ using the aluminum reflectors.
the attached picture is one of those test set ups. this set up produced dim image.

i also, posted this result with hertz web

 

[rmpmla]

i changed my reflector to soup ladle after i found out that reflected light is the one covering the four corners of the screen and the bright circular light directly from the lamp. am i right?
anyways, this is the result with soup ladle reflector. condenser to LCD distance is around 13.5" and lamp engine

 

[aad1972]

In your last photo, is that just me or are you getting some vignetting around the corners of the screen? Is that from having the lens resting so close to the screen? Good job though!

 

[rmpmla]

In your last photo, is that just me or are you getting some vignetting around the corners of the screen? Is that from having the lens resting so close to the screen? Good job though!

thanks add1972. yes, the corners are not lighted up but this is due to off centered fresnel relative to the LCD. please,correct me if i'm wrong on this because i just based this on my actual test/adjustment.
the reason for off centered fresnel is due to eagerness of cutting it into size.
the CRT projection lens has a very short focal of around 6". i tried moving it outward but image became blurred.

 

[rmpmla]

here,s another screenshot.
A VGA hack was needed for the Redant PSone LCD since it does not have a composite input.
i do the monitor swap to switch to 640 X 480 interlaced. personally, i would not advise this as it may mess up your PC, unless it is a dedicated one.

 

[rmpmla]

attached is the modified box for the last two screen shots i posted.
i added a mirror between lamp and fresnel to to increase distance with minimal extension of the first box. beside the CRT projection lens is the H-sync/V-sync mix to VGA adapter.

 

[borloloy]

rmpmla

bro, where did you buy this surplus lens?thanks

 

[rmpmla]

rmpmla

bro, where did you buy this surplus lens?thanks

borloloy, i ordered the CRT projection lens from surplusshed (USA). visit their website - www.surplusshed.com.
Actually, i ordered two pcs but the other one is Fujinon. i can sell it to you at cost

 

[joker35]

your projector is verry good with crt lens.
but crt lens is verry big

 

[borloloy]

rmpmla,

if you don't mind, how much it cost? so, i know how much do i have to earn. thanks

 

[rmpmla]

your projector is verry good with crt lens.
but crt lens is verry big

thanks joker35, you might say that it is big. i got an NEC and a Fujinon, the diameter of the lens averages to about 4 1/2". including the housing the diameter would be around 5". so this can still be installed on box with height of around 6".
the dimension of the box on my initial post is around 12"X11"X6"

 

[rmpmla]

your projector is verry good with crt lens.
but crt lens is verry big

price of lens is $15 plus air mail charge. someone already inquired with me about total or landed cost, as i may recall, it is around
P2,300.

 

[rmpmla]

upon alignment of the fresnel with the LCD, this is what i got