公开(公告)号：US3747005A

公开(公告)日：1973-07-17

申请号：US3747005D

申请日：1971-02-01

Applicant: MOTOROLA INC

Inventor： FREIMARK R ,  NILSSEN O

IPC: H03F3/183 ,  H03F3/04

CPC classification number: H03F3/183

Abstract: An audio power amplifier comprising a transistor operated as an emitter follower which is quiescently biased so that the DC current through the output speaker is small. A feedback circuit connected between the output and the control electrode of the transistor compares the magnitude of the output peak voltage with the magnitude of the bias potential on the control electrode. When the peak output voltage exceeds the magnitude of the bias potential the feedback circuit increases the control bias potential to raise the operating point of the transistor. Where the magnitude of the peak voltage of the output does not exceed the magnitude of the bias potential, there is no feedback and the bias potential is maintained to keep the transistor at its quiescent operating point.

Abstract translation: 一种音频功率放大器，包括作为射极跟随器工作的晶体管，该晶体管被静态偏置，使得通过输出扬声器的直流电流很小。 连接在晶体管的输出和控制电极之间的反馈电路将输出峰值电压的大小与控制电极上的偏置电位的大小进行比较。 当峰值输出电压超过偏置电位的大小时，反馈电路增加了控制偏置电位，以提高晶体管的工作点。 在输出的峰值电压的大小不超过偏置电位的幅度的情况下，不存在反馈，并且保持偏置电位以保持晶体管处于其静态工作点。

公开(公告)号：US3711656A

公开(公告)日：1973-01-16

申请号：US3711656D

申请日：1971-07-21

Applicant: MOTOROLA INC

Inventor： NILSSEN O

IPC: G11B5/29 ,  G11B5/49 ,  G11B5/16 ,  G11B5/28

CPC classification number: G11B5/4969 ,  G11B5/29

Abstract: A laminated multi-channel magnetic tape head apparatus has alternate lamina of copper and iron, with the iron lamina having gaps for recording/reproducing separate tape channels of multichannel tapes. A copper insert and suitable connectors form electrical conducting loops around a portion of each magnetic lamina, magnetic flux being induced in the magnetic lamina during recording and current being induced in the conducting loops during reproducing. An iron core piece with a coil mounted thereon magnetically transfers an electrical signal between a current conduction loop and the coil, with the coil being connected to a sound recording/reproducing system. Either the iron core piece is shifted from one magnetic lamina to another or switching between iron core pieces occurs thereby positioning the pickup portions of the tape head to the various tracks on the tape without physically moving the entire head assembly.

Abstract translation: 层叠的多通道磁带头装置具有铜和铁的交替层，铁层具有用于记录/再现多通道带的分离的带通道的间隙。 铜插入件和合适的连接器在每个磁性层的一部分周围形成导电环，在再现期间在导电环中记录和电流期间在磁层中感应磁通。 具有安装在其上的线圈的铁芯片在电流传导环路和线圈之间磁传递电信号，线圈连接到声音/再现系统。 铁芯片从一个磁性层移动到另一个磁片之间或在铁芯片之间切换，从而将带头的拾取部分定位在带上的各种轨道上，而不会物理移动整个头部组件。

公开(公告)号：BR7017444D0

公开(公告)日：1973-04-10

申请号：BR21744470

申请日：1970-02-13

Applicant: MOTOROLA INC

Inventor： JABBAR R ,  NILSSEN O

公开(公告)号：CA938701A

公开(公告)日：1973-12-18

申请号：CA84784

申请日：1970-06-05

Applicant: MOTOROLA INC

Inventor： NILSSEN O

IPC: B60H1/22

Abstract: 1,264,735. Alternator control of heaters. MOTOROLA Inc. 15 June, 1970 [24 July, 1969], No. 28813/70. Heading H2H. A system for providing rapid heating when an automotive vehicle is started up employs two alternators, which can feed their voltage outputs either in phase or out of phase through a resistive load. In the normal running condition, when no electrical heating of the vehicle is required, thermal .switch 94 is in the open position, and switches 14 and 90 are in the positions shown by the continuous lines. In this condition the field coils 10 and 22 of the two alternators 12 and 24 are connected in series and the output voltages from the threephase coils of one alternator are in phase with the other, thus there is no voltage drop across the resistors 54, 56 and 58, and no heat is generated. However in this configuration a voltage does exist between the mid points of the tappings 72, 74, 76 and -earth, so that power is supplied by a rectifier unit 78 to the D.C. automotive load, i.e. to power lighting, the ignition system &c. When bi-metallic strip 94 -makes contact, due to drop in temperature e.g. when the vehicle is cold the switches 14 and 90 take up the position shown by the -dotted lines. 'In this position the alternator field core 10 is connected in parallel with field core 22 and the polarity of the voltage across it is reversed. As a result of this the voltages developed -by the two alternators are 180 degrees out of phase, thus producing a voltage drop across the resistors 54, 56 and 58. To further enhance the current through the heat resistors the voltage regulator is effectively disconnected by closure of bi-metallic strip 94. This system may be used for the rapid heating of an automotive vehicle just after starting. It should be noted that if the tapping points 72, 74 and 76 are in the centre of resistors 54, 56 and 58, then no power is obtained via rectifier 78 when the alternators are supplying outof-phase voltage.

公开(公告)号：CA939026A

公开(公告)日：1973-12-25

申请号：CA76202

申请日：1970-03-02

Applicant: MOTOROLA INC

Inventor： JABBAR K ,  NILSSEN O

IPC: H03H2/00

公开(公告)号：SE357704B

公开(公告)日：1973-07-09

申请号：SE1002470

申请日：1970-07-21

Applicant: MOTOROLA INC

Inventor： NILSSEN O

IPC: B60H1/22 ,  B60H1/00

Abstract: 1,264,735. Alternator control of heaters. MOTOROLA Inc. 15 June, 1970 [24 July, 1969], No. 28813/70. Heading H2H. A system for providing rapid heating when an automotive vehicle is started up employs two alternators, which can feed their voltage outputs either in phase or out of phase through a resistive load. In the normal running condition, when no electrical heating of the vehicle is required, thermal .switch 94 is in the open position, and switches 14 and 90 are in the positions shown by the continuous lines. In this condition the field coils 10 and 22 of the two alternators 12 and 24 are connected in series and the output voltages from the threephase coils of one alternator are in phase with the other, thus there is no voltage drop across the resistors 54, 56 and 58, and no heat is generated. However in this configuration a voltage does exist between the mid points of the tappings 72, 74, 76 and -earth, so that power is supplied by a rectifier unit 78 to the D.C. automotive load, i.e. to power lighting, the ignition system &c. When bi-metallic strip 94 -makes contact, due to drop in temperature e.g. when the vehicle is cold the switches 14 and 90 take up the position shown by the -dotted lines. 'In this position the alternator field core 10 is connected in parallel with field core 22 and the polarity of the voltage across it is reversed. As a result of this the voltages developed -by the two alternators are 180 degrees out of phase, thus producing a voltage drop across the resistors 54, 56 and 58. To further enhance the current through the heat resistors the voltage regulator is effectively disconnected by closure of bi-metallic strip 94. This system may be used for the rapid heating of an automotive vehicle just after starting. It should be noted that if the tapping points 72, 74 and 76 are in the centre of resistors 54, 56 and 58, then no power is obtained via rectifier 78 when the alternators are supplying outof-phase voltage.

公开(公告)号：BR7200464D0

公开(公告)日：1973-05-10

申请号：BR46472

申请日：1972-01-28

Applicant: MOTOROLA INC

Inventor： FREIMARK R ,  NILSSEN O

IPC: H03F3/183 ,  H03F3/04

Abstract: An audio power amplifier comprising a transistor operated as an emitter follower which is quiescently biased so that the DC current through the output speaker is small. A feedback circuit connected between the output and the control electrode of the transistor compares the magnitude of the output peak voltage with the magnitude of the bias potential on the control electrode. When the peak output voltage exceeds the magnitude of the bias potential the feedback circuit increases the control bias potential to raise the operating point of the transistor. Where the magnitude of the peak voltage of the output does not exceed the magnitude of the bias potential, there is no feedback and the bias potential is maintained to keep the transistor at its quiescent operating point.