Search found 4 matches

by dave
Wed Dec 30, 2020 5:22 am
Forum: Hardware
Topic: Uzebox component video (YPbPr) video output
Replies: 7
Views: 10337

Re: Uzebox component video (YPbPr) video output

Finally found some time to fully assemble the Y/Pb/Pr circuit. Seems to generate colors almost perfectly. Here is a screenshot taken with an action-cam. It's a fish-eye lens, badly distorted, however action-cam seems to give a better reproduction of colors than photos taken with my tablet: uzebox-yp...
by dave
Mon Nov 30, 2020 10:20 am
Forum: Hardware
Topic: Grayscale Uzebox (no AD725)
Replies: 6
Views: 7895

Re: Grayscale Uzebox (no AD725)

By the way, if you want a proper RGB->grayscale conversion, you might want to use the resistor network from the "Y" channel of the Y/Pb/Pr design I posted here . This network should also be more correct WRT the 75 ohm termination (the original black&white uzebox design uses 75 Ohm to g...
by dave
Tue Oct 27, 2020 8:42 am
Forum: Hardware
Topic: Uzebox component video (YPbPr) video output
Replies: 7
Views: 10337

Re: Uzebox component video (YPbPr) video output

Do you want NOT gates or do you want diodes for the "Blue-Luma" and "Red-Luma" channels? Minus doesn't mean the same as plus-the-inverse does it? Can't currently imagine how one would you use diodes for negation?! The more usual approach is to implement the RGB->YPbPr mixing mat...
by dave
Sat Oct 24, 2020 7:31 am
Forum: Hardware
Topic: Uzebox component video (YPbPr) video output
Replies: 7
Views: 10337

Uzebox component video (YPbPr) video output

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.d...