This thing has 4 self resonating strings powered by energy of the sun. In the box is an ebow circuit.

The electronic circuit uses a sensor and a driver coil. The sensor is amplified using a LM386 opamp and is driving the driver coil. The main difference with the standard ebow circuit is that this one has one circuit and 8 coils. For some reason it resonates better with less voltage using more coils...around 4.5 to 6 volt.

veroboard design