This pattern generator is based on an ATMEGA8 running at 16MHZ.It can produce 14 images that can be used for tv testing.

Click on the images to see some of them in detail.

The generator runs in RGB mode in B/G system.For composite video you need a RGB to PAL converter.I used a MC1377P but is absolete know.

Another option is to use an AD724 or AD725.The images can be selected one by one by pressing the select switch.

With the other three switches you can kill each color in raster mode.

The recomended voltage for the generator is 9 to a maximum 12V dc/500mA that can be provided from a pack.

In 12V the 7805 gets very hot and it needs a heatsink. If you experience problems with synchonization, change R14 to 22Ω.

For RGB version you need a Scart to Scart connector with ALL conections.A pinout of the scart can be found here.

The code is written with Bascom-Avr from MCS Electronics.

The trial version of the program can compile up to 2K of code so you can't modify the code.

The sch and brd files can be viewed and edited with EAGLE from Cadsoft.

Go to downloads page to get a compressed file with bascom,eagle files and instructions

I hope you'll enjoy building this project. if you have any questions or comments drop me a line.

Don't forget to check for time to time for updates or use the RSS feed.  

RGB version

PCB

Composite version

PCB

RGB version

schematic

RGB version

Component placement

Composite version

schematic

Composite version

Component placement