Xvive vactrols VTL5C1 VTL5C3 VTL5C3/2 – optocouplers for your DIY build.
Close replicas of the original Excelitas versions, which are not available any more.
These vactrols are used on many 200 series and Eurorack modules like lowpass-gates.
Datasheet VTL5C1
Datasheet VTL5C3