15" LCD-based Projector Project

1. LCD: Westinghouse 15" LCD (http://www.westinghousedigital.com/pc-31-3-15-lcd-monitor.aspx)
2. Lenses:
   1. Projection: Varifocal Triplet (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=23&products_id=81)
   2. Field: 220m FL, 15.5"x15.5"x0.125" (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=23&products_id=40)
   3. Condenser: 220m FL, 15.5"x15.5"x0.125" (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=23&products_id=40)
3. UV Glass: 15.5"x15.5"x0.25" (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=26&products_id=31)
4. IR Glass: 15.5"x15.5"x0.125" (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=26&products_id=80)
5. Lamp: 250W Metal-Halide Lamp (http://www.diyprojectorcompany.com/catalog/product_info.php?cPath=22&products_id=49)
6. Case: 400mm x 400mm x 540mm wood, Picture (Dia)
1. 3 sheets of 2' x 4' x 0.75" plywood
7. Tuner: AverMedia TV Box 9 (http://www.averm.co.uk/avermedia/products/tvtuner_AVerTV_box9.html)
8. Screen: 120" (diag.) 4:3 (http://www.pcconnection.com/ProductDetail?Sku=5848246)
9. Audio: IN PROGRESS

Despite having ordered my parts from "DIYProjectorCompany.com," I would not recommend them (and will probably be changing the above links when I build my next projector). An order placed on 21Dec05 finally shipped on 20Mar06, and arrived on 22Mar06 (91 days after initial order).

With a LOT of help from an expert woodworker, my projector is now assembled and usable. I forgot to take pictures along the way, but I'll take some of the various disassembled pieces as I modify it. Here are the current images.

The design (based on the "SV-11" design from DIYProjectorCompany.com) was pretty simple, and seems to be optically correct. However, we did make some alterations during construction of the box.

Deviations from the original design include:

• Extra "box" at rear where exhaust nozzles are. The lamp scorched the wood with no air circulation.
• No Fresnel swing range, but it could be added later.
• Forward Fresnel lens is in the wrong spot, about 0.5" too far forward at the moment
• The design did not include intake, exhaust, or fans -- but I had these in mind when I designed it, so they were easy to add.

Step-by-Step Guide: (incomplete)

1. Obtain parts
2. Cut wood:
   1. 2 pieces of ...

Notes:

• Determining width and height from aspect ratio and diagonal size:
  HEIGHT = sqrt(DIAGONAL² / (ASPECT² + 1))
  WIDTH = HEIGHT * ASPECT
  Example:
  DIAGONAL = 15 inches; ASPECT = 4:3
  HEIGHT = sqrt(15² / ((4 / 3)² + 1))
  HEIGHT = sqrt(225 / (1.777778 + 1))
  HEIGHT = sqrt(225 / 2.777778)
  HEIGHT = sqrt(81)
  HEIGHT = 9
  WIDTH = 9 * (4 / 3)
  WIDTH = 12