Main > Monitor/Video Forum
The ultimate VGA to SCART adapter
gambaman:
--- Quote from: buttersoft on April 25, 2020, 01:23:39 am ---Hah, no i don't think so. I'm only using EasyEDA online PCB designer, i do not have kicad or anything else :(
--- End quote ---
You can also use EasyEDA. Just do the following:
-Extract the files "ayuda_corte_carcasa.pro" and "ayuda_corte_carcasa.kicad_pcb" from the previously linked zip file.
-Create a new zip with the files you extracted.
-Go to the EasyEDA menu and select document->Open->Kicad
-Select the zip file you have just created.
P.D: KiCad is libre and free. You can download it from https://www.kicad-pcb.org/
buttersoft:
Ahhh, ok thanks! I've had such terrible time trying to import anything into EasyEDA i think i gave up. It's an awesome site, but not great for reverse-engineering anything, if i can use the term that broadly.
buttersoft:
Hi Gambaman, I've been taking a look at your cool adapter, because i'm hoping to cut it down a little - i only need video and would like to keep the LED's. You mention in your first post that all the circuit strictly needs are the PIC, two resistors and two capacitors.
To keep the LED's as well, the components i seem to have left on the board are the PIC, along with R1, R6, R7, C1 and C2. Should there be another resistor, and if so, which one?
Are C1 and C2 just for power/noise filtering?
Thanks!
gambaman:
--- Quote from: buttersoft on July 03, 2020, 07:52:06 am ---Hi Gambaman, I've been taking a look at your cool adapter, because i'm hoping to cut it down a little - i only need video and would like to keep the LED's. You mention in your first post that all the circuit strictly needs are the PIC, two resistors and two capacitors.
To keep the LED's as well, the components i seem to have left on the board are the PIC, along with R1, R6, R7, C1 and C2. Should there be another resistor, and if so, which one?
--- End quote ---
Maybe you should also leave R5. It is used to lower the 5V of the PIC output to the nominal voltage of the RGB selection (pin 16 of the SCART connector). I think you will probably not break your TV if you connect directly the PIC output to SCART RGB selection, but just in case...
--- Quote from: buttersoft on July 03, 2020, 07:52:06 am ---Are C1 and C2 just for power/noise filtering?
--- End quote ---
Yes. Maybe your implementation will work without them.
gambaman:
With the current firmware, when the PIC detects a correct output, it waits for a long time before activating the output. Some testers say it is annoying because, when they switch to a game with a different resolution, the SCART input on the TV is disabled. I think it can be solved by modifying the firmware. In the source code there is a line like this "#define countdown_duration 30000". The SCART input will reactivate faster if you replace "30000" with a lower value (lower than 2300 and higher than the number of lines of your TV). I suggest mounting the PIC on a socket so that it is possible to test several values without desoldering it.
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