SyncBaby - SNES VGA Adapter [Completed]
SyncBaby is a compact and efficient SNES AV Multi-out to VGA D-Sub (with 3.5mm audio-ouput ) for your Super Nintendo to output 15Khz RGB.
Finally, no more poor quality, clunky, unshielded, leaky capacitor SCART cables; convert your SNES output to shielded VGA connection right away!
Some features of this board:
- High quality, low ESR, genuine Kemet 220uF Capacitors
- Onboard power filtering through decoupling capacitors - no external power required
- Genuine Texas Instruments LM1881 sync separator and cleaner
- Clean 15Khz VGA output
- Genuine Amphenol Female D-Sub connector
- 3.5mm audio output jack
- No vias whatsoever
- High quality 1.6MM black soldermask PCB
The SNES Mini/Jr units, which were some of the last SNES units produced and were a smaller than normal form factor, will require modification to properly use this device, as they do not natively support RGB output. Typically most SNES units are compatible with the SyncBaby without modification. A great resource to learn more about RGB compatibility is found below:
The biggest trick to assembling this by yourself is the SNES AV-Out plug, which I got from sacrificial SCART cables. They can be purchased cheaply on Ali Express and you can cut the plug off and easily pry the top and bottom apart without doing much damage.
You will have to desolder the existing wires off the plug pins and solder the plug pins onto the PCB. In the image below you can see you can directly solder the leads to the top side of the PCB, however on the bottom side there’s a lot more work as the board isn’t thick enough (1.6mm) to reach the bottom row of AV plug pins. My solution was to use thin kynar wire and cut small pieces and solder bridges one by one. It’s a little bit time consuming. Someone can probably just bend the pins enough to create a solder bridge but it risks breaking connections in the housing! Another possible solution is to use 0-ohm surface mount resistor and stand them up vertically to close the gap.
Before starting soldering be sure you have the plug orientation right! The AV ridge should be top center. I mistankingly soldered the plug on upside down on a few occasions and it’s frustrating to have to redo delicate work.
Under Side (not pretty)
SyncBaby board uses the LM1881 by Texas Instruments, it just fits back into the housing when you put the top/bottom encosure back on (luckily!). You may want to use some glue if you did too much damage taking apart the plug, but I find it almost always will click back securely.
VGA cables may give a minor amount of tension and flex on the rear of the SNES unit, I find this is quite minor and if concerned you can add a standoff.
This board utilizes the following components which can be ordered from Digikey or Mouser.
|1||SJ1-3533N||CONN JACK STEREO 3.5MM R/A|
|3||160R15W104KV4T||CAP CER 0.1UF 16V X7R 0805|
|3||A750BG227M0JAAE020||CAP ALUM POLY 220UF 20% 6.3V T/H|
|1||LM1881N/NOPB||IC VIDEO SYNC SEPARATOR 8-DIP|
|1||F951C106MPAAQ||CAP TANT 10UF 16V 20% 0805|
|1||SD0805S020S1R0||DIODE SCHOTTKY 20V 1A 0805|
|1||SNES AV PLUG||From SCART Cable|
|1||1734530-3||TE Connectivity AMP Connectors 5749768-1 (FEMALE)|
Download an image of the schematic and the source files below:
Schematic and PCB are done in Diptrace, I highly suggest anyone give it a try over KiCad.
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