Abstract: A soldering tool wherein the soldering tip comprises part of a single loop of iron that forms the energizer means, temperature sensor, heating element and solder melting member. The power oscillator comprises a primary transformer coil that is in series with a primary capacitor to form an LC resonance circuit. The primary transformer coil is inductively linked to the iron loop so that the resistance of the soldering tip forms a load resistance on the LC resonance circuit. The power supply includes first and second power transistors connected to a source of DC current. The base of each power transistor is inductively linked to the primary transformer coil so that the power transistors alternately conduct and supply power to the power oscillator. The frequency and amplitude of oscillations in the power oscillator determines how often and how long the power transistors conduct.

Abstract: In a cassette type tape recorder, a bush rigidly mounted on a wall of a housing of the recorder around an opening in said wall from which a capstan for propelling the tape cantilevers, the capstan being received in a bore of said bush and protruding from the top of said bush by a length identical with the width of the tape, said bush having a base and a cylindrical body forming a step with the base having an outer diameter slightly less than the diameter of a cassette opening, and an upper tapered portion, said bush body entering said cassette opening and centering the latter by said tapered portion and supporting same by the stepped base, whereby the capstan rotation is guided by the bush and the camber effect on the protruding length is so reduced as to minimize the wow and flutter values of the tape recorder.