Hey, this is my first post! I wanted to buy a signal generator, but they are so expensive that I decided to build one myself. I thought I would be nice to use a graphics adapter's vga output, because it is rather fast and the D/A conversion is done by the graphics card. I only need to amplify the signal.
The problem is, when the cathode ray travels back to start a new row or frame, the output on red/green/blue channel is 0. I have to bridge this time interval. My question is, how can I do this?
Maybe it is possible to delay one of the channels in order to use the delayed signal when another signal is blanking? The switching circuitry could be controlled by the v- and h-sync signals that are also provided by vga. Maybe there is also another possibility to work around the blanking. Thanks for your ideas!
BadElvis