Ways to Compress Air

[ffeoc]

I need to know how I can compress air without an air compressor. Are there any mini compressors or air pumps?
I am working on project at work. I can give much detail, but this item must be able to expel air repeatedly on demand. It can't use an external air source such as (compressed gas bottle). This part should produce about 180 psi to 350 psi of air repeatedly on demand. This item should be no bigger than a fist. Anyone have any idea of where I can start, or websites/books I can get info on producing compress air?

 

[pablo02]

This topic sounds hauntingly similar to one posted a month or so ago that was appropriately deleted... ffeoc, is it? Please give more details as to your intent or possibly this question gets the boot too...