Okay im interested in building an electronic siren. Its for paintballing. Any tips?

 

One of the ones in this link is supposed to be loud - http://www.discovercircuits.com/S/siren.htm.

 

This one? http://www.redcircuits.com/Page84.htm

looks good. Thanks for the link. Reason im interested in an electricronic one is another site has an electromechanical one but it seems to need a lot of maintainance. Also they are much bigger so that sort of output would probably be overkill for me.