Abstract: An insert for a cigarette lighter socket includes a body and a contact rejuvenation tip protruding from and non-rotatable relative to the body. The contact rejuvenation tip includes abrasive elements on its surface for contacting an electrical contact in a cigarette lighter socket. In a preferred embodiment, the abrasive elements are pyramidal in shape and situated on an end surface of the contact rejuvenation tip. The abrasive elements scrape off electrically insulating material on an electrical contact in a cigarette lighter socket as the contact rejuvenation tip is rotated relative to the contact in the cigarette lighter socket. The insert includes a flexible strip attached to the body for resiliently centering a part of said body and said contact rejuvenation tip within said cigarette lighter socket.

Abstract: A frequency compensation circuit influences an X-radiation protection (XRP) circuit in a high voltage regulator circuit for a cathode ray tube (CRT) to operate properly under varying frequencies of voltage energizing a high voltage transformer. The frequency compensation circuit includes an input to a source of first voltage related to a high voltage output of the high voltage regulator circuit, a voltage source generator responsive to a high voltage generator frequency of the CRT. A voltage controlled circuit is responsive to the voltage source generator for controlling conveyance of the first voltage to the XRP circuit so that a relatively constant proportion of the high voltage output is reported to the XRP circuit under varying high voltage generator frequencies.

Abstract: The protection circuit comprises a storage capacitor which is coupled with a terminal of a secondary winding which charges said storage capacitor during the on-interval of the switching transistor. During the off-interval of the switching transistor the charge of the storage capacitor is fed to the driver stage or the control capacitor for closing or keeping closed the switching transistor when one of the secondary windings has a short circuit.

Abstract: A switched mode power supply includes a modulator s an input for receiving a sense signal and an output for developing a pulse modulated signal. An output switch is coupled to the modulator and is switched in accordance with the pulse modulated signal. A generator develops a supply voltage responsive to operation of the switch. A feedback circuit coupled between the modulator output and a modulator input limits the duty cycle of the pulse modulated signal.

Abstract: A television receiver has a switched mode power supply for regulating an output voltage, including a power transformer having a primary winding coupled to an unregulated voltage via a power transistor. The power transistor is controlled by pulses from the output of a controller. In order to sweep the base-emitter charge from the power transistor in order to end collector-emitter conduction, the base of the power transistor is coupled to the output of the pulse generating controller via a capacitor in parallel with at least one diode. During a pulse from the controller, the capacitor is charged to a voltage equal to the forward biased drop across the diode(s). At the end of a pulse at the output of the controller, the voltage across the capacitor provides a negative voltage at the base of the transistor, thus sweeping out the base-emitter charge and sharply turning the transistor off.

Abstract: A phase-lock-loop circuit of a two-loop deflection arrangement is located in a first integrated circuit. The phase-lock-loop circuit generates a first signal at 32Xf.sub.H that is capacitively coupled to a tank circuit. A regenerative amplifier stage that is located in a second integrated circuit has an input terminal that is coupled to the tank circuit and an output terminal for producing a second signal. During normal operation, the second signal is synchronized to the first signal. The second signal is utilized in a phase-control-loop circuit of the two-loop deflection arrangement for generating a synchronized deflection current in a deflection winding.

Abstract: A first pair of transistors, Q721 and Q723, operating, each, as an emitter follower, has a relatively low emitter current. The emitter followers drive corresponding base electrodes of transistors of a second pair of transistors, Q148 and Q149, coupled as a differential amplifier. A current gain compensating transistor Q726 has a current gain that tracks current gain variations of each of the transistors of the second pair. A base electrode current of the compensating transistor and a second current i.sub.Q727 that is unaffected by current gain variations are summed. The summed current is coupled via transistors Q722 and Q724 of a current mirror arrangement to first and second junction terminals, 610e and 610f. The junction terminals are coupled between the respective emitter electrodes of the emitter followers and the base electrodes of the second pair.

Abstract: In a switching power supply for a television apparatus, a switching stage is coupled to a source of DC input voltage and to an energy storage inductance for developing a source of DC supply voltage. Operation of the switching stage generates a switched waveform voltage in the inductance. The primary winding of a flyback transformer is coupled to and energized by the DC supply voltage. A second winding of the flyback transformer is coupled to the inductance and provides a magnetic path, via the flyback transformer, for energy to circulate between the source of DC supply voltage and the energy storage inductance. An auxiliary winding is magnetically coupled to the inductance and to a load circuit, such as a high power audio stage, for transferring at least a portion of the circulating energy to the load circuit. Additionally, the flyback transformer may be used to directly transfer energy to the load circuit.

Abstract: A high voltage generator of a television receiver includes a high voltage transformer having primary and high voltage windings. The high voltage winding is coupled to an ultor terminal of a picture tube via a high voltage rectifier. Retrace pulses applied to the primary winding are stepped up by the high voltage winding for generating an ultor voltage. A source of supply voltage is coupled to a current resupply terminal of the high voltage winding and produces voltage pulses at the resupply terminal having amplitudes which vary in accordance with ultor voltage loading. An envelope detector is coupled to the resupply terminal for envelope detecting amplitude variations of the voltage pulses to develop a size control signal which follows loading induced variations in ultor voltage. The size control signal is coupled to a scanning current modulator, such as a diode modulator, for modulating the scanning current in a manner that regulates the raster size.

Abstract: An ultor voltage generator for a television receiver includes a piezoelectric transformer arrangement constituting a plurality of piezoelectric transformer elements, each having input, output and common electrodes. The voltage gain characteristic of each element has a relatively narrow frequency bandwidth about its natural frequency of mechanical vibration. The plurality of piezoelectric transformer elements are electrically connected in parallel. The output electrodes are connected to a supply terminal of the arrangement, and the input electrodes and common electrodes are connected to input and common terminals, respectively, of the arrangement. A source of alternating voltage is coupled between the input and common terminals to generate a higher amplitude alternating output voltage between the supply and common terminals. The alternating output voltage is applied to a doubler rectifier to generate a DC ultor voltage for the television receiver picture tube.

Abstract: To regulate a supply voltage for a television receiver load circuit, such as the ultor voltage for a high voltage circuit, the primary winding of a transformer is coupled to a source of alternating input voltage for developing an alternating polarity voltage across a secondary winding of the transformer. A saturable reactor includes a magnetizable core with a reactor winding wound around the core. The reactor winding and the transformer secondary winding are conductively coupled to develop an alternating polarity voltage across the reactor winding. The transformer secondary winding is magnetically isolated from the saturable reactor such that the magnetic flux flowing in the reactor core does not link the transformer secondary winding. A capacitor is coupled to the saturable reactor winding for developing a circulating current that aids in magnetically saturating a portion of the reactor core associated with the reactor winding.

Abstract: A high voltage generator of a television display is responsive to an alternating voltage, such as a retrace pulse voltage, for developing an ultor voltage at an ultor terminal. A protection circuit for the high voltage generator includes a comparator that develops a television display disabling signal when activated. A circuit that develops a sense voltage representative of the ultor voltage is coupled to an input terminal of the comparator so as to develop the disabling signal when the ultor voltage exceeds a predetermined level. To provide an overload disabling capability, an ultor beam current sensing circuit is coupled to the input terminal of an operational amplifier. The output terminal of the amplifier is coupled to a bias voltage source and to an input terminal of the comparator.

Abstract: In a remote controlled television receiver, the regulator circuit of the main television receiver power supply is made responsive to a remote on/off command signal in order to turn the receiver on and off. A deflection flyback transformer provides operating voltages to the ultor supply and other auxiliary supplies which power such load circuits as audio and vertical deflection. A horizontal output transistor is coupled to a B+ operating voltage terminal of the main power supply through a flyback transformer primary winding. After initiation of the on-state of the command signal, the regulator ciruit rapidly develops a B+ operating voltage. The initially uncharged filter capacitors of the auxiliary supplies act as a low impedance shunt across the flyback transformer primary winding during the start-up interval.

Abstract: To provide static convergence correction motion to the outer beam of three in-line electron beams of a color cathode ray tube, a magnetized sphere is located adjacent each outer beam. Each sphere is magnetized across a diameter to produce, for example, a two-pole magnetic field for providing the correction motion. The two-poles are separated along a polar axis. Each sphere is located in a housing which permits rotation of the polar axis of the sphere into alignment with the longitudinal axis of the cathode ray tube and permits rotation of the polar axis out of longitudinal alignment in both horizontal and vertical planes.

Abstract: A flyback transformer includes a high voltage winding with a first rectifier coupled to the high voltage lead and a second rectifier coupled to the ground return lead. The rectifiers are poled in the same direction to conduct beam current and block the DC current path in the winding during the trace interval. The distributed capacity forms a capacitive voltage divider and developes an intermediate DC voltage in the high voltage winding. The intermediate DC voltage developed at an intermediate AC null terminal of the high voltage winding is selectively adjusted by structure which is selectively capable of adding sufficient distributed capacity to appropriately change the capacitive voltage division ratio.