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#14411

marqs
Participant

Yes, there are 3 flaws I’ve repeatedly seen in most “sync stripper” cables:
1. Missing 75ohm termination resistor in LM1881 input (before the cap)
2. LM1881 is placed inside the scart assembly at the display end of the cable, even though ideally it should be on the other end
3. Missing 75ohm sync driver (or series resistor) on LM1881 output (OK if the purpose is to generate TTL level sync)

In practice, the end result is often still somewhat working even if all those flaws exist. The effective voltage level from LM1881 drops to much lower level if directly loaded by 75ohm termination inside TV, OSSC etc.