One of the cheaper routes is to pick up a Opto22 module, you could either build a small socket with veroboard or pick up a 4 posn board.
There is a sellers on ebay have them for $1.50 G4 ODC5, the are switched by 5v and control up to 60vdc @ 3A.
If getting a board separate there are two types of modules, the G4 and the older straight ODC5.
Al.


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