A faithful reproduction of May 1976 "Video Ball Game" by Electronics Australia magazine.
Thanks to the kind help of Jon Stanley, who also built this. John's demo.
The files are kicad schematics and PCB.
The errata in July 1976 on page 125 list a few corrections.
- IC 5 is incorrectly shown as NAND on the schematic. Jon also discovered this independently.
- 2 0.0047uF polystyrene.
- There is also an error in a the RF circuit, but we are not building that.
- The Quad NAND and NOR integrated circuits today have diffirent pin configurations than those in 1976. This means the circuit board as is cannot be used.
- The 2200uF Capacitor is replaced with a 0.33uF capacitor and a 7806 6V regulator, that converts the 9V battery down to a stable 6V.
- 0.1uF decoupling capacitors are added to the VCC pins.
- pin headers are made for all switches and connectors so that they are all on one side of the board.
- ground and probe pins are added across the circuit for debugging.
- the board is printed double-sided, with a ground back plate, and removing the need for any jumper wires.
- the RF tuner circuit is completely removed, and the video signal is directly fed to composite video.
- Replaced IC5 with NOR. it is incorrectly NAND on schematic. This changes a lot.