electronic circuit problem

[funkychunkz]

Hello, I´m having trouble seeing how these circuits works. Overall, what do they do? And I´m confused about how the transistors are wired. How do they work? Would appreciate some help. Thanks in advance / Funky

Imageshack link to both of the pictures below:

ImageShack® - Online Photo and Video Hosting

ImageShack® - Online Photo and Video Hosting

 

[FvM]

See this explanation of the astable multivibrator principle. Multivibrator - Wikipedia, the free encyclopedia

I hope, you can figure out the differences involved with the second circuit.