FIELD: physics.
SUBSTANCE: brush training ball has a light-emitting device. The light-emitting device has an electricity generating circuit and a light-emission control circuit. The electricity generating circuit generates electric energy from the kinetic energy of rotation of the brush training ball and powers the light-emission control circuit with the electric energy. The light-emission control circuit has first and a second light-emitting element. Depending on the value of output voltage from the electricity generating circuit, the first light-emitting element switches on to emit red light or the second light-emitting element switches on to emit blue light which, together with the red light, forms a purple colour owing to the persistence phenomenon, or the first light-emitting element switches off in order to significantly increase voltage to make the blue light brighter.
EFFECT: possibility of producing various lighting effects depending on different ranges of angular velocities of the brush training ball, which enables the user to determine the current value of the angular velocity depending on the emitted light.
5 cl, 14 dwg
