mikro wrote:Hello everyone,
my first post here.
I have two questions regarding H-Sync and the Sync Strike:
1. The German version of the product page (
http://arcadeforge.net/Scaler-and-Strik ... e::15.html) says that the C-Sync signal can be used also as H-Sync. However its English version (
http://arcadeforge.net/Scaler-and-Strik ... anguage=en) doesn't mention anything like that. So is it possible to get H-Sync from it or not?
2. While not strictly related to the Sync Strike, I'm puzzled by one thing: SCART2VGA is, obviously, meant as a device to connect SCART to monitors with VGA input (albeit 15 kHz but that's not important now). VGA has, among others, clearly separated V-Sync and H-Sync signals. So how on earth is possible that this device explicitly avoids separating those signals:
This adapter does not convert RGBs [CSync from SCART]
to RGBHV [RGB + H + V],
it simply passes through RGBs to the VGA connector. [...]
Please ensure that your device/monitor accepts RGBs before purchasing! Huh? What kind of VGA monitor it is then? I'd imagine that this device simply HAS TO do it otherwise its purpose would be really hard to image?
Sup, welcome. Sync Strike was revolutionary 10 years ago. Today, several other products do the same thing and cost much, much less. 30,95 EUR from the most expensive part being the LM1881 chip that
costs 3,24 EUR if you don't buy in bulk. Every sync stripper using LM1881 does the exact same thing, just varying over what RGB format is on the input and output and if the sync is kept at TTL level (~3V) or a resistor drops that to 75 ohm level (~300 mV).
Check LM1881 out:
LM1881 takes Composite video or Luma or CSYNC at 75 ohm level, at pin 2, and outputs CSYNC at TTL level on pin 1 and Vertical Sync on pin 3. Pin 8 is the power supply and you have no need for pins 5 and 7. CSYNC is in actuality the horizontal and vertical sync information on the same pin. We call it S in RGBS.
The Sync Strike description is confusing. Computers that need separate H and V Sync are happy to accept CSYNC instead of H Sync since the horizontal sync information is still there.
1. CSYNC can be used as H Sync 99% of the time. I would say 100% but maybe someone can cite an exception.
2. SCART2VGA is the same thing using the same LM1881 chip. The description is stupid and is what is confusing you. It may not take pin 3 output's Vertical Sync and send it to VGA's pin 14. I think it does, it's just trying to make sure someone buys it and doesn't expect interlaced video to get transformed into progressive video. RGB video pins are passed through unaltered.
