Where can I get the condenser or transitor located in a 42 Catalina Model M0426AW5C3TL Combined Ceiling and light fixture which allows fan and light to operate separately?

Your question is a little puzzling.

Typically, fan/light combination fixtures have a ground wire (bare or green), a single "neutral" wire (white), a black wire (typically it runs the light) and another COLORED (red, blue...) to run the fan.

If your house wiring does not include the additional wire to the fan you may not be able to wire the fan and light separately... that's why they have pull chains that hang down; so you can control the light and fan independently.