Uzebox component video (YPbPr) video output
Posted: Sat Oct 24, 2020 7:31 am
Hi,
given that my TV does not feature a SCART input, nor an S-Video input (but C-Video and component video), I came up with a design that uses many resistors and two 74HC inverter ICs to generate a YPbPr component video signal.
All required components can currently be sourced in Germany from segor.de. Pretty expensive, but hassle-free for private (i.e. non-business) customers.
Orderd all parts and am going to try to assemble this on a eurocard / matrix board PCB sometime in november.
This is the first uzebox I'm trying to build. Maybe it is too naive to assume that video output will simply work when done like this? Any comments?
Partial/draft schematic attached. Does omit most of the stuff that can be copied over from the original uzebox F5 design.
The DAC resistor network I simulated using the octave script dac.m, attached below. Black is at about 0.3V, 0V, 0V, SYNC at 0V, 0V, 0V. White at about 1V, 0.7V, 0.7V.
Will first try assembling with just the Y output. In this mode it should work similar to the "Uzebox minimal" black/white output.
cheers,
Dave
given that my TV does not feature a SCART input, nor an S-Video input (but C-Video and component video), I came up with a design that uses many resistors and two 74HC inverter ICs to generate a YPbPr component video signal.
All required components can currently be sourced in Germany from segor.de. Pretty expensive, but hassle-free for private (i.e. non-business) customers.
Orderd all parts and am going to try to assemble this on a eurocard / matrix board PCB sometime in november.
This is the first uzebox I'm trying to build. Maybe it is too naive to assume that video output will simply work when done like this? Any comments?
Partial/draft schematic attached. Does omit most of the stuff that can be copied over from the original uzebox F5 design.
The DAC resistor network I simulated using the octave script dac.m, attached below. Black is at about 0.3V, 0V, 0V, SYNC at 0V, 0V, 0V. White at about 1V, 0.7V, 0.7V.
Will first try assembling with just the Y output. In this mode it should work similar to the "Uzebox minimal" black/white output.
cheers,
Dave