ELECTROTHERAPY MACHINE

A machine for inducing sleep and other therapy effects by means of repetitive electrical pulses wherein potential danger to the treated subject is avoided by the generation of trains of rapid alternately positive and negative pulses whose vectorial sum is equal to zero, thus avoiding the application of net direct currents. Trains of pulses are applied to the subject through a transformer to avoid shock hazard. A timer attenuator allows gradual rise in current over a fixed time period to a fixed level, maintenance of the fixed current level for a variable time period which may be set, and gradual decline in current over a fixed time period.