electronic parts - equivalent database?

[Amrita]

hi all fellow diy'ers
i'm new to this forum and as the trend goes i'm starting with a question.

i'm wondering if there exists such a database for finding equivalent electronic components?(transistors, diodes, opamps, ic's ++)

i know i could use the online stores to do this, but as they usually use different distributors it takes way to long going true all stores and check.

i'm planning on doing some junkyard diy.
atm i'm collecting part's,
and final goal is to put these components to good use building amp's and so forth with minimal buy inn.


amrita