Experimental VGA Processor

This processor board makes mixing of all kind of signals possible. Video, audio and all kind of other signals can be mixed together. And because the operational amplifier LT1260 can handle signals up to a frequency of 130Mhz it's ideal for mixing analog video signals.
The board has two VGA connectors, one for the input and the other one for the output. An audio output signal can be taken from the pins near the VGA output. The VGA connector for the input bypasses the Sync signal to the output VGA connector. For other inputs like other VGA sources or audio signals there are three potentiometer and three extra pins reserved.
If one has two synced video sources the Experimental VGA Processor could be used to blend these two videos.

Bread Board Version

If one use long pin strips for the input connection the Experimental VGA Processor could be easily combined with a bread board. In this combination it's a perfect experimental setup to explore and mix all kind of signals.

Paper PCB

The VGA Connector

here one find a manual for the VGA Connector


  • Resistors:
  • 15x 75 Ohm
  • 1x 330 Ohm
  • 6x 1.5 kOhm
  • 6x 16 kOhm
  • Capacitors:
  • 3x 100 pF
  • 3x 100 nF
  • 2x 4.7 µF
  • Diodes:
  • 1x LED
  • Semiconductors
  • 1x LT1260 OpAmp
  • 1x RKZE 0505D DC-CD converter
  • Mechanical:
  • 1x IC socket, 16pins
  • 2x VGA sockets
  • 1x micro USB connector board
  • 9x 2pin strip
  • 1x 3pin strip
  • 1x 5pin strip
  • 4x jumpers
  • Potentiometers:
  • 6x 100 kOhm


The Experimental VGA Processor was designed by Wolfgang Spahn 2019.
It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Creative Commons License