ok so i am leaving tommorow to go to my brothers house in MA for the week and cant bring my amp with me as it is to big. Is there anyway that i can use a 4 ohm speaker (3watts) a 9 volt battry and an old guitar jack to make a quick amp so i can at least here myself play?
maybe a ruby or little gem? http://runoffgroove.com/ruby.html
If you have a few resistors, caps, and the right sort of op-amp, yes. If that's all you've got, nope.