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Reply To: SNES sync issues after mod

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#14592

marqs
Participant

CSYNC on SNES multiAV (where available) comes from an emitter follower circuit that outputs ~2.5 volts through 100ohm series resistance. Even if that is directly connected to 75ohm termination, it drops to safe ~1.1V level. However, if Voultar’s board uses THS7374 to drive csync at 5v without series resistance (in TTL mode), it can cause issues. As said above, easiest thing to try is opening the TTL jumper on the board.