This is a very versatile active circuits- 

I use these on Les Pauls, Strats and Telecaster with equally breathtaking results-

First of all you've got a nice fat bottom boost that turns a Fender into a Gibson, then as you turn the dial you begin to get the classic "Tube Drive" gain and mid boost-as you turn the knob up you get even more boost and a nice 3 dimensional expansion of highs and lows. Play this through a 4-10 Bassman with a Strat and it's just this ten foot deep- walking on clouds- Stevie Ray sound.

 The Mini Expander Circuit runs on a single 9 volt battery, and battery life is excellent. The unit has it's own push-pull pot built in- Pulled up you've got a stock guitar- NO CHANGES to the sound- Pop the knob down and the effect engages..