This RF Modulator replacement uses the excellent Texas Instruments THS7316 HDTV amplifier chip. It provides superior image quality to transistor based RF Modulator replacements. This also works in Commodore 128.
The board is professionally SMT assembled except for the THS7316 chip that I’ve soldered by hand because it wasn’t available on the parts library of the SMT assembly service I used. THS7316 chips are sourced from Mouser. I’ve slightly modified the c0pperdragon’s design by increasing the vertical size to 20 cm to be compatible with the SMT service. Schematic remains unchanged.
The board has a solder jumper. Leave it open for short boards that use 5V VIC-II-chip. Solder the bridge if you have a long board that uses 12V VIC-II.
GND1 should be connected to ground on long boards. For short boards it’s not needed as the ground is available on RF Modulator pin 3.
If you have made a custom S-Video cable that has 300 Ohm resistor it should be removed as it’s not needed with this mod.
I will include a 10 pin male pin header with the board.
All boards are tested as working on a C64C before shipping.
I’ve designed a version of LumaFix64 to go with this board. Available here.