Where can I get the chips for my Omega Race?

jehuie

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I've got a nice clean looking Omega Race PCB but it's missing a few chips, one of which I haven't been able to cross-reference.

The one I can't seem to figure out has three numbers on it. It says AD40715, AD561J and 8135. Don't know which of the three I should be looking it up by but none of them seem to be helping me much. Anyone know?

Also need a 74LS138N and TL081CP.

Thanks!
 
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