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System Fairchild composite video modification

Working mod schematic

Construction can be used for many other machines as well.
Channel F composite mod schematic.jpg

Example PCB

Composite mod rendered PCB top.pngComposite mod rendered PCB bottom.png
Example of PCB using SMD components.


Fairchild Video Entertainment System / Channel F

Channel F composite hookup point.jpg
Connect composite in wire to the resistor by the RF box where the black clamp is placed. Audio can be picked from speaker output using about 150kOhm in series.

Channel F II

Channel F II composite video modification overview.jpg Channel F II composite mod detail.jpg

Channel F II composite video modification jumper.jpg Channel F II mod Composite points.jpg

Channel F II composite mod audio.jpg Channel F II mod voltage divider.jpg

5V can be picked directly from the capacitor, here connected with red and blue wires in top right position of the circuitboard.
One of the locations for composite signal source has been hooked up with a red clamp on a resistor by the LED.
You can lift the jumper in the green circle to improve video quality.
Optional composite video hookup points are shown with green dots around that jumper. Audio hookup points are located to the right of the channel switch.
Green/blue dots has a low level audio signal, red one has TTL levels and need to be lowered to be used. Blue is an empty via offering a neat installation.
Using the low level without R8 may cause image interference.
A voltage divider with 22kOhm and 100kOhm on the red marker (TTL level audio) gets the audio close to what the RF hookup uses.
The voltage divider means that you can skip R8 in the schematic and connect audio signal between R8 and C3.

SABA Videoplay 2

SABA Videoplay 2 composite video mod hookup.jpg SABA Videoplay 2 composite mod second image.jpg
In this example 5V and ground is hooked up directly to the 5V regulator, video is taken from capacitor pin (yellow wire).
The white wire from the speaker is originally connected to the little RF board, connect it to the PCB instead.
In the image you see audio hooked up with a loose resistor and capacitor instead of using the PCB.