Among the applications for this circuit, we can mention the production of pulses of high intensity and short duration in transducers ultrasonic for medical applications. The frequency is basically given by capacitor C, which must be between 2.2 nF and 10 nF for operation in the ultrasound band, and have higher values for the audible range. Frequency setting is done at the 1 M ohm potentiometer. The power FET must be mounted on a heat radiator, and equivalent to the indicated type can be used. The suggested type can produce pulses of more than 1 A intensity. If the load is inductive, low impedance, its connection is direct. For transducers of the piezoelectric type, a transformer must be used. The diodes are commonly used in silicon as the 1N4148.