I saw this story on Hackaday yesterday
"And this isn’t a mod in which the signals are lifted from the Spectrum’s colour encoder circuitry, instead it uses an FPGA hooked directly to the ULA chip to generate the component video itself."
The github page is linked to from the Hackaday article. Might need some serious soldering iron skillz though.
FPGA to take video directly from the ULA
FPGA to take video directly from the ULA
Derek Fountain, author of the ZX Spectrum C Programmer's Getting Started Guide and various open source games, hardware and other projects, including an IF1 and ZX Microdrive emulator.