Ultrasonic oscillator

Claim 1

An ultrasonic oscillator for automobiles comprising: a storage battery for supplying D.C. power, said battery having a pair of terminals one of which is grounded; a DC-DC converter connected across said storage battery for supplying stepped-up D.C. power to a pair of ungrounded converter output power lines which are electrically isolated by the converter from said storage battery terminals; an oscillator circuit including a series circuit of a choke coil and a capacitor connected across said output power lines, and a Darlington transistor configuration, having emitter, collector and base terminals, the collector and emitter terminals of the transistor configuration being connected across said capacitor, said choke coil being adapted to raise voltage at said collector terminal of said transistor configuration to a level higher than D.C. voltage produced across said output power lines; and an ultrasonic oscillator connected across the base and collector terminals of said Darlington transistor configuration for positively feeding back voltage at said collector terminal to the base terminal to thereby establish the oscillation frequency of said oscillator circuit, whereby said oscillator receives the higher level voltage raised by said choke coil to generate high ultrasonic energy.