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SOLD OUT: PCE/Turbografx THS7374 RGB amps/cables and pre-amped consoles


mickcris

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i have started the process of updating the amp board to viletim's suggested resistance at the output. Will look the same as the previous version, but will be more correct. The old design was not hurting anything, but might as well make it better. Here is viletim's explanation:
http://nfggames.com/forum2/index.php?topic=4822.msg34061#msg34061

"Unfortunately the RGB signal the PC Engine is not 0.7 Vpp, it's actually 0.8 Vpp (I know because I bought a PC Engine a few months ago). To compensate for this I suggest attenuating the output slightly. Instead of a 75 ohm resistor in series with the output, you could use 86 ohms in series and 586 ohms to ground. This way it still looks like a 75 ohm output to the outside world. For E24 resistor values try 91 in series and 470 to ground. Not perfect but good enough - 0.67 Vpp is much better than 0.80 Vpp."

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