Main > Monitor/Video Forum

GreenAntz RGB to component transcoder

<< < (5/24) > >>

Zebidee:
A significant update: GreenAntz transcoders will now be able to support composite sync INPUT via VGA.

This means you can now use GreenAntz with adapter dongles like DVI-VGA and DP-VGA and HDMI-VGA, as well as straight VGA.

GreenAntz VGA has previously required separate Horizontal and vertical sync input in order to generate composite sync to blend with the luma (Y). That is no longer the case, now GreenAntz can take a composite sync input, which it will process, regenerate and clean before mixing into the YPbPr output.

This upgrade involves some extra jumper pins on the PCBs, which allow you to choose either separate H+V or composite sync input. A jumper and dupont wire (wire with female ends that slip onto the pins) will also be provided with future GreenAntz.

In the future your GreenAntz will look like this, with an extra jumper next to the VGA port. Jumper on is the default (H+V sync) configuration:



To enable composite sync input, you will need to remove the jumper and from pins and replace with dupont wire as pictured:

Zebidee:
For those people who have already bought GreenAntz, here are some simple instructions so you can upgrade it to composite sync input. You will need a soldering iron.

Find the spots circled in yellow.



First, remove the wire connecting the two spots (pins 1&2) next to the VGA port. This wire enables vertical sync. Pin 2 takes Vsync from VGA, Pin 1 passes it on to composite sync processing. Once you have removed the wire and solder, replace with 2 pin headers. Use a jumper on these pins to enable separate H+V sync. With the jumper off, Vsync is disabled and GreenAntz will accept composite sync via H sync line.

When I talk about adding pin headers, I mean use these guys. I don't know what they are called otherwise, but you can buy them in strips very cheaply from electronics retailers. They break off easily with pliers.



Then add a single pin header to the the other spot circled. This is a Vcc source that is otherwise unused in the VGA version. Your GreenAntz will now look a bit like this:



Now for composite sync input, use a Dupont wire to connect Vsync Pin 1 to the Vcc pin. This "enables" composite sync. You might like to think of it as a blanking signal.



To simplify things: If you want to make GreenAntz permanently for composite input, you could just cut the wire connecting pins 1&2, and solder a wire directly onto pin 1. You can also get the Vcc "blanking" voltage from this other jumper spot for enabling/disabling the low-pass filter (LPF). The leftmost pin (at "U7", "DISABLE") has the Vcc required. You would need to move the jumper to the right ("ENABLE" position) in order to free up the pin.




Clear as mud? Please ask questions if you don't understand.

bobbyb13:
Very cool-

Proving that I should have bought 6 of these!
 :lol

I have a pile of other TVs that don't have component inputs.

Zebidee:

--- Quote from: bobbyb13 on February 25, 2021, 07:44:37 pm ---Very cool-

Proving that I should have bought 6 of these!
 :lol

--- End quote ---

Thanks Bobby. However you may have been prudent to wait a little, as I will upgrade all future GreenAntz as above. The composite sync input option really does make it more flexible.

Zebidee:
Another quick update:

I am currently building a SCART input version of GreenAntz. We have done SCART prototypes before, but this time we'll be able to take advantage of the sync building circuit for better sync filtering and injection into the luma (Y). Stay tuned!

Navigation

[0] Message Index

[#] Next page

[*] Previous page