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: Often an unmarked NPN transistor. Common successful replacements include the , , or .

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. : Often an unmarked NPN transistor

: The ultrasonic generator should never be switched on without the piezo-emitter submerged in water , as running it "dry" can destroy the circuit. : Often an unmarked NPN transistor

: The device typically utilizes a classical inductive three-point oscillator (inductive Hartley oscillator) to drive the piezoelectric element. : Often an unmarked NPN transistor

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.

: Often an unmarked NPN transistor. Common successful replacements include the , , or .

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.

: 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 typically utilizes a classical inductive three-point oscillator (inductive Hartley oscillator) to drive the piezoelectric element.

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.