2003/04/26: I was going to build a VGA to RGBS converter, but on 2003/04/16 I
found the
Altinex DA1910SX, and on eBay for $38 nonetheless! There was no way I
could build a VGA to RGBS converter of anywhere near this quality for anywhere
near this cost. It does not appear to be a true "Scan Converter",
but we use these at work and they appear to do the job. I may
still run in to some problems and have to build my own circuit or buy a true
Scan Converter. I will keep my findings posted below in case anyone out
there (including myself) wants to pick up where I left off.
- Original Idea/Credit:
http://www.epanorama.net/circuits/vga2rgbs.html
This circuit is discussed in detail
here.
- Secondary (similar) idea:
http://home1.gte.net/bs/4LCDPCB.html
http://home1.gte.net/bs/sharp2.html
- Commercial Solutions:
- Modifications/Deviations from original ideas:
- Put an adjustable POT on "R8"
- Parts:
| Part ID |
Description |
RadioShack Part # |
DigiKey Part # |
| C1 |
22uF 10V electrolytic |
272-1026 |
|
| C2 |
22uF 10V electrolytic |
272-1026 |
|
| R1 |
1/4 Watt 2.2K ohm |
271-312 |
|
| R2 |
1/4 Watt 2.2K ohm |
| R3 |
1/4 Watt 1.8K ohm |
| R4 |
1/4 Watt 1.8K ohm |
| R5 |
1/4 Watt 2.7K ohm |
| R6 |
1/4 Watt 47 ohm |
| R7 |
1/4 Watt 47 ohm |
| R8 |
1/4 Watt 47 ohm |
| U1 |
Quad 2-in XOR gate |
276-2819
(discontinued) |
DM74LS86N-ND
-or-
SN74F86N
(best, but must buy in quantities of 25) |
| T1 |
2N4401 NPN transistor |
276-2058
(MPS3904) |
PN2222AD26ZCT-ND |
| T2 |
2N4401 NPN transistor |
276-2058
(MPS3904) |
PN2222AD26ZCT-ND |
- Schematics:
2003/04/26: Just like the VGA to RGBS converter, I was going going to build
one of these. As luck should have it I also found an
Altinex
DA1914SX on eBay for $44.00. Again, I could not build one of these
for this quality at this price. Again, I leave you what progress I made
so that you can build one yourself if you really want.
- Original Idea:
Since I cannot find one, I am claiming the credit for this; this is not rocket
science!
I am pulling lots of ideas from other projects, such as:
Video Switcher
-
ICs Boost Video Performance
- Notes:
- It may not be enough just to toggle wires from source1 to source2.
I may need to issue a video reset of some sort.
Combined VGA2RGBS and RGBS A/B Switchbox
2003/04/26: This project is discontinued for reasons listed in the previous
two projects.
|
