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LM1881 Sync Separator

A lot of consoles do not offer composite sync, only composite video. C-video carries the C-sync information, along with a lot of extra crap many monitors don't need, and the result is an unstable display or a completely blank display. The LM1881 is a cheap ($3) chip that takes a C-vid signal and strips out the unecessary video data, resulting in a clean composite sync signal suitable for most monitors.

The Circuit

Usage Notes

There's not much to it. Simply connect the chip as shown.

  • You can safely ignore pins 3, 5 and 7.
  • All the parts are small enough to fit in a DB9 connector.
  • The LM1881 circuit is useful to generate a composite sync signal from a composite video signal. Connecting a c-sync signal to the input of an LM1881 may cause problems and should be avoided.
 av/lm1881.1258170862.txt.gz · Last modified: 2019/08/27 20:44 (external edit)
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