I'm a complete n00b when it comes to hacking cables, I've literally never done it before. So any advice on how to correctly wire an SCART to 5 BNC cable (R, G, B, Vertical Sync and Horizontal Sync) would be appreciated. I'm planning on hacking a SNES RGB SCART, if this is relevant at all. thanks for any help!
Why do you need to have the signals connected with bnc? Anyway just use this: http://pinouts.ru/Home/Scart_pinout.shtml
First check to see if you monitor can support Composite sync via Composite video as if it does then it's just a simple wiring up job. If it supports composite sync then you can strip the sync from the Composite video (pin 20) using a LM1881 chip. Although the SFC and US SNES do output Composite Sync, the European ones don't (replaced with 12V) and most RGB SCART cable will be wired up for Composite Video (which most TVs will strip the Sync off). If you do need H and V syncs, then you can use an EL1883 as it can be wired as if it was an LM1881 but the EL1883 is a surface mount chip so a bit trickier. You can use a NAND and AND gate to get a passable H-Sync signal from the V-Sync and C-Sync the LM1881. As you can see a bit more complicated then just wiring leads up.
The monitors I'm using are two ancient Mitsubishi Diamond Scan monitors, and from what I've found they do support composite sync: http://www.monitorworld.com/Monitors/mitsubishi/diamondscan20mhc3925atk.html (Please correct me if I'm wrong, I'm still a noob when it comes to this stuff) However, I'm a bit confused as this information says it supports composite sync but the inputs are horizontal and vertical sync types. And I'm using a NTSC console, with an RGB cable saying it will work out-of-the box with NTSC consoles. So do I need to use the EL1883 or the LM1881? I'm more confused now then I was in the first place >.<
Because RGB SCART cables will generally use Composite Video signals which the TV will strip the Composite sync from, you will need to build a circuit to strip the composite sync from the composite video. You will need an LM1881 and build this ultra simple circuit. Pin 8 on the SCART lead should give the 5V required by the LM1881 the triangles are grounds. Ground will be one of these pins 18, 21, 4, 18, 5, 9 or 13, check and use this for the outer part of the BNC Then wire up pins on the SCART to the BNC 7 (Blue) 11 (Green) 15 (Red) The NTSC SNES/SFC require the use of 220uf electrolytic caps if hacking a SCART lead then these will already be there. Feed pin 20 to the 0.1uf non electrolytic cap at pin 2 of the circuit and wire up pin 1 to the Comp / HD BNC connector on your monitor. Flick all dips at the back downwards and the dip on the front of the monitor to position 3 (downwards).
thanks for your reply, jamtex. You made this simple to understand. In the near future, I will either be going with this or an SCART to VGA method, I have to test out the monitor and see what works where first.
