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625 → 405-line Standards Converter
In designTelevisionPico405 lines
Last updated 28 September 2026
Pre-1964 British television sets only receive 405-line transmissions, which ended in 1985. This converter takes a 625-line composite source, digitises it, and a Raspberry Pi Pico rebuilds each frame at 405 lines. The result is modulated onto a Band I channel, with sound, so an unmodified vintage set can show modern pictures.
Addendum A describes an alternative ADC (TLC5510) with its own firmware build.
At a glance
| Input | 625-line composite video + audio |
|---|---|
| Output | 405-line video and AM sound on Band I |
| Processor | Raspberry Pi Pico |
| ADC | AD9280, or TLC5510 (Addendum A) |
Block diagram
Click a drawing to open it full size.
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.