RGB2C/S - composite and s-video module

... or a "built-in modulator" for your retro thingy ;)

Yes, I was away from keyboard for a while ;P

The "why ?"

So this idea came after I've bought a CPC 464 followed by a gray speccy +2.
Both machines are outputting RGB signal that is quite solid if you have a proper and dedicated cable. Problem is that I am tired of making a cable for every machine that I own. I've figured that it would be very handy to have some sort of a small modulator on a PCB that is capable of outputting composite or even better, s-video signal. Obviously, I started to look for an existing solution and I've found one. There is an excellent article on CPCWIKI that describes how it is done in a CPC world.
Bryce created a very nice solution based on an AD724 chip. That chip can handle RGB input signal and convert it to either composite or s-video - which is exactly what I need. However, I decided to make my own PCB.I wanted to have s-video and composite outputs on a single PCB.

Work in progress

Of course, I had to start with my own board layout so after a while ...

Yes, I know, I am not a routing PRO ;)

A few days later, the first batch of PCBs and parts arrived so I could start working again.

Sometime later I had the first unit ready for testing.


Amiga 500 was the first in a row to be tested.

Here is an outcome.

Composite video


I was super happy with an end result.
I only had to look for a nice place to install a PCB.
At first, I came up with an idea to remove the original RGB socket and put my module in sockets place. I've even 3D printed support for a PCB (red ABS).

However, after few shots of 40% tea ;P ... and some talks with my fellow friends from Lamers, I decided that It has to be moved somewhere else. If I remember correctly, Wiecz0r/Lamers pointed out that some people might wanna use RGB SCART cable that they already own.
Obviously, another good place to mount my module was right next to a motherboard - right under a floppy drive.

I must admit, that drilling a plastic case with 12mm drill is extremely hard.
It tears too much material at a time. Using a different tool and finishing a hole for cables with a file was so much better idea :D

CPC 464 was another machine waiting for some tests.

It took me a while to find proper solder points.

This time, previously 3D printed support, turned out to be quite handy :)

Here is how it works.

Composite video


I was a bit skeptical at first. I thought that RGB->S-Video or Composite will look like an output from old A520 modulator for Amiga, but after some tests, I am super happy with the quality of this mod.
Even composite video is way better than through original A500 modulator.

This mod will soon be available via Retro-Cloud online store

Atari 520 ST, Atari 1040 STe and Grey 128 +2 are waiting for this mod too :)

You can get it via retro-cloud.eu


Chaos is your redemption .... better run .... better hide

I come from Internetz :>