Main > Monitor/Video Forum
Video amp (RGBs) to boost SCART to arcade monitor
arcadeswede:
Hello!
As the title says, I'm looking for an RGBs amp circuit to boost 0.7Vpp video signals to 2-5Vpp (TTL) to connect retro consoles (or similar) to work on arcade monitors.
I was thinking about using an OP amp but I don't know how a circuit like that would look like?
I'm familiar with the etim RGB amp circuits found here: http://members.optusnet.com.au/eviltim/vga2arc/vga2arc.htm#acvid
It uses all different kinds of voltages like +5V, -5V, +10V etc. It would be nice to drive the RGB amp from just 5V or 12V found in many arcade cabinets. Also I think today, that kind of circuit could be smaller in terms of newer components maybe.
Does anyone have any experience in creating RGB amps?
arfink:
I'd suggest this: https://www.ultimarc.com/arcade-vga-and-video/arcadevga-accessories/arcade-monitor-video-amplifier/
arcadeswede:
--- Quote from: arfink on May 13, 2020, 07:56:06 am ---I'd suggest this: https://www.ultimarc.com/arcade-vga-and-video/arcadevga-accessories/arcade-monitor-video-amplifier/
--- End quote ---
I was looking into that but VGA has DC offset and SCART is AC coupled.
arfink:
I think you'll find that most arcade monitors care a lot less about signal quality than most. :P
BTW, I also found this if you're interested: http://www.geocities.ws/podernixie/htpc/cables-en.html#jammascart
EDIT: I should clarify that this document just has an un-amplified scart to arcade setup, which does work, but won't be very bright.
arcadeswede:
--- Quote from: arfink on May 13, 2020, 08:18:17 am ---I think you'll find that most arcade monitors care a lot less about signal quality than most. :P
BTW, I also found this if you're interested: http://www.geocities.ws/podernixie/htpc/cables-en.html#jammascart
--- End quote ---
Thanks for the link!
Is that so?
That link looked promising but again, I think the circuit at the bottom doesn't take in account the low 0.7Vpp that comes out from retro consoles. It seems strange to be able to just plug in RGB directly to the VGA/Arcade input. A friend of mine tried to connect his SNES (or was it SEGA Genesis?) to his arcade cab but got a very dim picture. And that's the reason I've started to look into boosting RGB and sync signals.