A description is given of a fast neutron spectrometer, based on the principle of measuring the time-of-flight of the neutrons. Neutron bursts are formed in a target by deflection of the ion beam of an accelerator by a radio-frequency voltage on the deflector. The time-of-flight of neutrons is measured by a slow-fast coincidence system with fast coincidence on the measuring line. The spectrometer was used to measure the neutron spectra of the reactions D(d, n)He3, T(d, n)He4, Li7(d, n)Be8, Li7(d, n)2α, Be9(d, n)B10. Neutrons with energy 4·06 MeV from the reaction Li7(d, n)Be8 have not yet been reported in the literature. They correspond to the 11·7 MeV level in the nucleus Be8, known from other nuclear reactions.