Hi,
@Voidling, I hope you don't mind me posting a reply here, but it very much continues along a similar subject...
As long as it is darkchip3 , I dont care how hard is it
I told this to Petrus too, but Im telling you now. I can get you PCB's made, I think I can get reflow stuff, and I know 3 ppl skilled with professional layout SW
I think I can get DLP chips from a repairman.
LED luma:
http://readalert.atw.hu/THE_ULTRA_HIGH_GAIN_SCREEN.pdf" onclick="window.open(this.href);return false;
PowerLEDs could be used to simulate an "iris" as well . Contrast would be killer, and the hardware brightness slider ... hmmmmmmmmmmm!!!!!! (im in love)
After using this 120hz DLP for a while. I can safely say , we want no more than 120hz. Thats as purrfect as it gets, still pictures, screenshots , purrfect. Rainbow is gone for me, others say its there, but its a very distant memory to me. Actually, we'd want less refresh rate , because sustaining 120fps in games is quite hard , and 50hz vsync would be way easier , hence 100hz shuttering. 150 Usd gfx hardware does that easily!!
ps.: Im prepared to sell ALL my vintage audio stuff to fund this project .
EDIT: forgot I can get you switch mode power supplies in all shapes & sizes
@tritosine - I'm still interested in getting a PCB made for controlling a DMD chip. I've fixed a fair few projectors before, but it's rare to find one with a Darkchip 3 for the sort of money I pay for faulty projectors (around £60 - £70 maximum from "your friendly neighbourhood auction site").
We basically need a board similar to George's design. A personal preference would be to have an Altera FPGA instead of the Xilinx though (I don't like the Xilinx software, and I'm much more familiar with Altera Quartus). Here's the link to George's DLP project files...
http://www.mediafire.com/?gkdozrrybqk2sv6" onclick="window.open(this.href);return false;
btw, I included a PDF file from TI (in the zip) because it contains some basic background info on how a DMD is controlled (page 20).
There are a few options here...
We don't even necessarily need the USB connection, just some spare pins for inputting digital video (or a DVI / HDMI receiver chip). I don't know how much memory bandwidth would be needed for say 100Hz, but I would think we'd want a fast chunk of DDR memory eventually. I'll have to work out some of the bandwidth stuff in advance.
It looks like many of the recent pocket LED projectors simply change the colour every time a horizontal "strip" of the image is updated (usually 16 "reset blocks" on a DMD), so it should be possible to get rid of the rainbow effect completely if we used LEDs. This can get expensive though, as you will eventually want to buy Phlatlight LEDs for decent brightness (believe me, these are still the best LEDs for the money but it soon adds up).
I currently have three brand new PCBs sitting here which I don't have parts for yet. Although this is for another project, the FPGA is of course completely generic - I did intend to try interfacing one to a DMD at some point.
The board has a fast enough FPGA, but I only used SDRAM for now (might still work for XGA @ 100Hz??). I'll have enough money to buy the parts soon, but I don't have a toaster oven for soldering the chips yet (the FPGA has VERY fine pin spacings). If anyone can help with assembling the board fairly cheaply then we might be able to work something out?
Having said all that, we would still need a separate PCB containing the DMD itself and a DAD1000 type reset chip, so we might as well start from scratch with a smaller FPGA (easier to solder, but still powerful enough). Or, just get a generic DMD / reset PCB made, then experiment with it using a separate connection from a cheap dev kit...
http://www.terasic.com.tw/cgi-bin/page/ ... ish&No=364" onclick="window.open(this.href);return false;
Remember, with any modern FPGA, decoding shutterglasses sync would be a piece of cake (he says
![Laughing :lol:](./images/smilies/icon_lol.gif)
). Also, with a DVI / HDMI receiver chip, it wouldn't be too difficult to support the modern 3D Blu-Ray modes directly (I've done a fair bit of research on this already, it requires some custom EDID data too).
So, some things to think about. I know it is doable with the right PCB and it won't be hugely expensive unless you start playing with Phlatlight LEDs and 3-chip DMD stuff.
George has laid out most of the groundwork already, we just a PCB first.
OzOnE.
EDIT: I've probably mentioned this before, but here's what my LED projector and DIY RGB combiner look like (minus the FPGA board)...
http://img31.imageshack.us/img31/9523/file0085.jpg" onclick="window.open(this.href);return false;
(Notice the nice Xbox 360 GPU heatsink there - obviously wasn't working too well in the Xbox anyway.
![Laughing :lol:](./images/smilies/icon_lol.gif)
)