  Features of the development of activity cycles in the solar-type stars and
fast-rotating cool dwarfs have been considered for 65 stars observed in some
decades. Cycles with duration of 7-18 years compared to the solar cycle were
found for about 50% of the studied stars. In cooler dwarfs with rotation
periods of less than 5 days, cyclic changes in brightness occur on longer
scales, up to 80 years. Activity of the highest level is produced on K dwarfs;
their main cycles are long and have the highest amplitudes. Both old and young
solar-type stars show a similar tendency in increasing the cycle length with a
slower rotation. No evidence for a relation between the rotation period and
duration of cycles was found for cool dwarfs with $P_{rot} < 5$ days.
