After more than 25 years of designing and building preamps, Mi-SiÕs team of engineers proudly introduces a truly significant and unique breakthrough: a high-performance, fully active preamp that does NOT NEED BATTERIES. No 9-Volt, no AA, no AAA, no lithium Š NO BATTERIES at all!
Every used battery is a hazardous waste and needs to be properly disposed of to avoid entrance of toxic chemicals into our soils and waterways. Our battery-free technology is environmentally conscious and designed to eliminate this disposal problem.
Our technology is much more than just a battery-free concept. Our preamps have the most natural and the least quacky sound on the market.  Mi-SiÕs custom linearization scheme allows us to get the best possible sound from a piezo pickup.
Obviously, the less stuff put in the instrument, the better its mechanical and acoustical integrity is preserved. This philosophy is the driving force behind Mi-Si's approach - the minimalistic design with the maximum functionality.

About Mi-Si

Mi-Si Electronics Design, Inc. (pronounced "My-Sigh") was founded in April 2004 by an experienced team of engineers with a passion and a drive to make music technology better - for both artists and music lovers. Although new to the marketplace, Mi-Si's engineers bring an arsenal of expertise and more than 25 years experience in the amplification field, developing exciting and revolutionary electronics specifically designed for acoustic amplification.


Player's Choice Awards 2011 Acoustic Guitar Bronze.


Mi-Si and Pick-up the World

Mi-Si is pleased to announce that Pick-up the World has selected Mi-Si as the addition to their product line. We are excited to be working with Pick-up the World and look forward to providing musicians with the best sound yet without batteries.

For more information on Pick-up the World, please visit


Mi-Si Debuts Motif, A Condenser Under-Saddle Pickup

True to its tradition of engineering innovation, Mi-Si has introduced Motif, the industryā€™s first condenser under-saddle pickup system. Motif is the result of Mi-Siā€™s groundbreaking research and development in acoustic amplification, research that pioneered battery-free active amplification, a wirelessly controlled preamp (Cutless), planar coil magnetic pickups for acoustic guitars (Duo and Magpie), and now, and [...]


Mi-Si and Fender Japan

Mi-Si is pleased to announce that our product, Crystal, has been selected by Fender Japan to power their ukuleles. For more information on ukulele made by Fender Japan, please see: