I built a Swamp Thang tremolo per this layout and the linked schematic.
http://tagboardeffects.blogspot.ca/2012 ... thang.html
When I use it it seems to boost my signal as well and add tremolo. The tremolo seems to be either drastic or extremely subtle with not really any points in between. I can't say that with 100% percent certainty as even direct into my laptop with no volume my guitar was bothering my sleeping roommate (sigh). I can do a proper audio evaluation tomorrow.
I do know something is wrong though, as the LED behaves strangely. It get significantly brighter as the speed knob is increased. And seems to be blinking fastest mid-sweep as opposed to at the end of sweep. It also goes nearly dark when I flip the speed switch.
Any clues?