Abstract: A circuit and a method for filtering the ripple in an output of a multi-phase alternator in a vehicle system having a regulating circuit that regulates the output of the alternator includes a switch connected in series between a system voltage and the input of the regulating circuit, and circuitry for closing the switch at a predetermined phase of the voltage of at least one of the stator windings of the alternator. The circuitry for closing the switch operates to close the switch at a conduction switchover point among the stator windings in synchronism with a voltage waveform of the at least one of the stator windings, and is timed to produce an aliased waveform for application to the regulator. The output of the switch is applied to an integrator for integrating the output voltage from the alternator during an entire time cycle period of one of the windings of the stator coils for application to the regulator.

Abstract: Regulator circuitry for connection to field coils of an alternator in an electrical system of a vehicle having a system voltage maintained by the alternator includes circuitry for providing a variable drive to the field coils of the alternator, and circuitry for generating a velocity signal related to a rotational velocity of a driven shaft of the alternator. The regulator circuitry also includes circuitry for producing a deviation signal when the system voltage deviates more than a predetermined amount from a predetermined value, and circuitry responsive to the deviation signal to vary the field coil drive to the alternator at a rate dependent upon the velocity signal. In addition a method is presented for regulating the voltage delivered by an alternator in an electrical system having a system voltage maintained by the alternator.

Abstract: A delay timer formed by a sequence of inverters alternating in type, some with single and some with multiple outputs each having an output connected to the input of the next. An output from each of the multiple output inverters is connected to the timer output.

Abstract: An electro-thermal isolator coupler including a pair of electrically isolated thermal receivers specifically spaced from an electrically isolated thermal transmitter such that their combined signals will produce a thermally compensated electrical output. A second pair of electrically thermal receivers is included in an error circuit which corrects the driver of the thermal transmitter for losses across the thermal coupler. Depending upon the use, the thermal coupler can be used in combination with RF capacitive coupling. Individual power terminals for the electrically isolated regions assure electric isolation.

Abstract: The various components of a series current-limiting element are fabricated on a single integrated circuit, resulting in substantial cost savings. MOS technology is employed and the series protection elements include IGFETs. The series current-limiting element impedances are synthesized actively, and the series current-limiting impedance in one of the tip and ring lines accurately tracks the series current-limiting impedance in the other to maintain close longitudinal balance between the tip and ring lines.

Abstract: A plurality of logic gates having common data inputs are selected by activation and deactivation of switches connecting the logic gates to circuit power terminals. In one embodiment both power leads of the logic gate are connected by two power switches to two circuit power terminals. In a second embodiment, the first power lead of the logic gate is continuously connected to the first circuit power terminal and the second gate power lead is connected to the second circuit power terminal by a first power switch for a select and to the first circuit power terminal by a second power switch for a deselect. The second embodiment includes a buffer inverter on each logic gate output whose power leads are connected to the circuit power terminals as are the logic gates. Alternatively, the second switch could connect the input of the inverter to the first circuit power terminal for a deselect.

Abstract: Disclosed is a microcomputer-controlled frequency synthesis television tuning system utilizing variable tuning ramp speeds following channel selection. Channel tuning is expedited by means of three ramping speeds employed during the tuning process. The system initially ramps quickly toward the selected channel and then automatically and incrementally reduces tuning speed as the proper frequency is approached. Once the proper frequency has been reached, the variable ramp speed signal acquisition mode is terminated and an AFC mode is initiated. Large frequency changes are thus made possible over short periods to accomodate widely separated channels efficiently.

Abstract: An automatic CRT tracking circuit for a television receiver includes an amplifier having adjustable gain and offset transfer functions for coupling a video signal to the cathode of the CRT electron gun. Feedback loops are used to adjust both the gain and offset transfer functions of the amplifier, either independently of each other or in a common mode, to compensate for changing cathode voltage versus cathode current characteristics such that a desired video signal versus cathode current relationship is achieved despite variations in the CRT.

Abstract: A system is described for remotely adjusting the control functions, such as hue, volume and the like, of a television monitor. The system includes an encoder for generating a repetitive multi-channel signal whose period is constant, each channel including a control pulse having a parameter (such as pulse period or pulse width) which is variable by user-operable controls included in the encoder. A remotely located decoder, associated with the monitor, receives the multi-channel signal and converts each control pulse to an output signal whose value is a function of the variable pulse parameter so as to develop a multi-channel output signal for application to and adjustment of the monitor's control functions.