model was designed with an increased power consumption (from 9W to 30W in some iterations) to improve the efficiency of the ultrasonic emission into the liquid.
Repair enthusiasts and technical forums describe the internal circuitry of the Retona USU-0707 model was designed with an increased power consumption
: If the power indicator is on but no ultrasonic waves are visible, it usually points to a burned-out transducer or a generator fault . : A red LED (HL1) protected by a
: The ultrasonic generator should never be switched on without the piezo-emitter submerged in water , as running it "dry" can destroy the circuit. The device works by emitting ultrasonic waves into
: A red LED (HL1) protected by a diode (VD1) indicates the generator is operational. Operational Highlights Efficiency : The
: The device typically utilizes a classical inductive three-point oscillator (inductive Hartley oscillator) to drive the piezoelectric element.
Retona USU-0707 " is a compact ultrasonic washing device consisting of a power supply unit and a small piezoceramic radiator (activator). The device works by emitting ultrasonic waves into water to dislodge dirt from fabric fibers.