This design uses Common-Emitter Amplifier (Class A) with 2N3904 Bipolar Junction Transistor. Use “Voltage Divider Biasing” to reduce the effects of varying β (= ic / ib) (by holding the Base voltage constant) Base Voltage (Vb) = Vcc * [R2 / (R1 + R2)] Use Coupling Capacitors to separate the AC signals from the DC biasing voltage (which only pass AC signals and block any DC component). Use Bypass Capacitor to maintain the Q-point stability. To determine the value of each component, first set Q-point close to the center position of the load line. (RL is the resistance of the speaker.)
上传时间： 2020-11-27
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Research on microwave power amplififiers has gained a growing importance demanded by the many continuously developing applications which require such subsystem performance. A broad set of commercial and strategic systems in fact have their overall performance boosted by the power amplififier, the latter becoming an enabling component wherever its effificiency and output power actually allows functionalities and operating modes previously not possible. This is the case for the many wireless systems and battery-operated systems that form the substrate of everyday life, but also of high-performance satellite and dual-use systems.
上传时间： 2021-10-30
上传用户：得之我幸78
This paper presents a new type of electromagnetic damper with rotating inertial mass that has been devel oped to control the vibrations of structures subjected to earthquakes. The electromagnetic inertial mass damper (EIMD) consists of a ball screw that converts axial oscillation of the rod end into rotational motion of the internal flflywheel and an electric generator that is turned by the rotation of the inner rod. The EIMD is able to generate a large inertial force created by the rotating flflywheel and a variable damping force devel oped by the electric generator. Device performance tests of reduced-scale and full-scale EIMDs were under taken to verify the basic characteristics of the damper and the validity of the derived theoretical formulae. Shaking table tests of a three-story structure with EIMDs and earthquake response analyses of a building with EIMDs were conducted to demonstrate the seismic response control performance of the EIMD. The EIMD is able to reduce story drifts as well as accelerations and surpasses conventional types of dampers in reducing acceleration responses.
标签： electromagnetic response Seismic control using
上传时间： 2021-11-04
上传用户：a1293065
全志A20核心板配套开发底板Cadence原理图+ Pads2005格式PCB文件+转换后的AD格式原理图PCB文件：A20_DVK1_BASE_V16_Altium_Designer15.PcbDocA20_DVK1_BASE_V16_BOM_20151015.xlsxA20_DVK1_BASE_V16_Gerber制板文件.rarA20_DVK1_BASE_V16_PADS2005_PCB30.pcbA20_DVK1_BASE_V16_PADS2005_PCB_ASCII.PcbDocA20_DVK1_BASE_V16_PADS9.5.pcba20_dvk1_base_v16_SCH_20151015.pdfA20_DVK1_BASE_V16_元件位置查找图_20151102.pdfA20_DVK1_BASE_V16_原理图_OrCAD16.5.DSNA20_DVK1_BASE_V16_导出到AD格式的原理图和PCBA20_DVK1_BASE_V16_导出到AD格式的原理图和PCB.rarA20_DVK1_BASE_V16_顶层元件编号丝印图_20151102.pdfA20_DVK1_BASE_V16_顶层元件规格丝印图_20151102.pdf主要器件如下：Library Component Count : 58Name Description----------------------------------------------------------------------------------------------------ANTBATTERY_1BEAD CAPCAP NP 贴片电容,Y5V,6.3V,2.2uF,+80%-20%,0603CAP NP_2_Dup1 X5RCAP NP_Dup2 0402 1uF X5R 6.3V +/-10%CAP NP_Dup3 0402 1uF X5R 6.3V +/-10%CAPACITOR CAPACITOR POLCON1 CON12 CON3 CON4 CON50 CON6CON6A CONNECTOR45X4 C_Generic DB15-VGA_0 DIODE DIODE DUAL SERIESFM25CL64 FR9886SPGTR FUSEHOLDER_0 HDMI19_PLUG HEADER 2 INDUCTOR/SMINDUCTOR_4 C4K-2.5HINDUCTOR_Dup2 INDUCTOR_Dup3 IRM-2638LED_0M93C46_0 MINI USB-B_6 MODULE_CAM_PA0505 PH163539 PLAUSB-AF5P-WSMT_0 PUSHBUTTON_TSKB-2L_0PowerJACK R1 0805 R1_0805 RES2X4RESISTOR RESISTOR_Dup1 RESISTOR_Dup2 RESISTOR_V RJ45_8PGR_Generic S9013SMD_Dup2 SD_MMC_CARD2_0 TP_5 TestPoint_3TitleBlock_Gongjun USBPORT2 USB_WIFI_0 XC6204VZ_3 LDO 3.3V 300mA( SOT-25 )rRClamp0524P
上传时间： 2021-11-08
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全志A33核心板应用开发底板OrCAD16.5格式原理图+PADS9.5格式PCB图+转AD格式的原理图PCB文件,可以做你的学习设计参考，应用开发底板主要器件如下：Library Component Count : 180Name Description----------------------------------------------------------------------------------------------------1_0.5KE100A1_1.5KE100A1_2.5KE100A1_3.5KE100A1_4.5KE100A2N6770_0?_0 ACA-5036 ADV7123_0 ANTANT_0 ANT_1 ANT_2AP6493_0AP6493_1AP6493_2AT24C16 AT88SC0104CAW1625_CSI_eLQFP176_0R0603R1 0805R1 0805_Dup1R1_0805RESISTOR RESISTOR_0RESISTOR_V RT9266PE_0RT9266PE_1 RTL8152B_0 R_0 R_Dup1R_Dup2R_Dup3 R_GenericS9013SMDSD_MMC_CARD2_0 SEW290_0 SEW290_1 SIM_SOCKET_0 SWL-N10S_0SWL-N10S_1 SWPB2X1BSchottkyTC_SMD TP_5TestPoint_3TitleBlock0-AW TitleBlock_Gongjun U-CONN_0USBHOST_X2 USB_WIFI_0WPM4005_11bga280_3 capnp cappoleLQFP176_0 eLQFP176_6 eMMC-BGA169
上传时间： 2021-11-13
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74HC595 A4950 MAX3232 ULN2003AD STM32F207VCT6 AD集成封装库，原理图库器件型号列表：Library Component Count : 53Name Description----------------------------------------------------------------------------------------------------1N4148 High Conductance Fast Diode1N4448 High Conductance Fast Diode1N914 High Conductance Fast Diode1N914A High Conductance Fast Diode1N914B High Conductance Fast Diode1N916 High Conductance Fast Diode1N916A High Conductance Fast Diode1N916B High Conductance Fast Diode2N3904 NPN General Purpose Amplifier74ALS86 74HC595 8M贴片晶振 A4950 直流电机驱动AO4805CAP CapacitorCAP SMD CapacitorCON2 ConnectorCON2*10 ConnectorCON2*12P ConnectorCON2*7 ConnectorCON2*9 ConnectorCON3 ConnectorCON4 ConnectorCON5 ConnectorCON7 ConnectorCap Pol 极性电解电容DIODE DiodeFUSE1 FuseFUSE2 FuseINDUCTOR2 IRF7351PbF N-MOSJS1-12V-FLED MAX487 MAX809RD R0.125 Less than 1/4 Watt Power Resistor.RES2 RGRPI*4 Res1 ResistorSGM8955XN5G/TR 测量放大器SM712 SN74LV4052AD SP3232ESST25VF016B-50-4I-S2AFI2C Real-Time Clock.STM32F107VTC6 STM32F107VTC6SW DIP-4 编码开关SW-PB SwitchTPS54302 45UA静态电流 3ATVS SMBJ30CAULN2003 XC6214XTAL Crystal OscillatorPCB封装库列表：Component Count : 40Component Name-----------------------------------------------4G模块-外置7D181K0603-LED0603C0603R0805C12061210181232255569-2*1P直针5569-2*2P直针AT-26CAP-D8DO-214AANHSOP-8J-SPDT-5JTAGL
上传时间： 2021-11-15
上传用户：ttalli
基于NE555设计的声音传感器模块ALTIUM硬件原理图+PCB文件，2层板设计，大小为29x30mm，Altium Designer 设计的工程文件，包括原理图及PCB文件，可以用Altium(AD)软件打开或修改，可作为你的产品设计的参考。主要器件型号列表如下：Library Component Count : 8Name Description----------------------------------------------------------------------------------------------------2N3904 NPN General Purpose AmplifierCap CapacitorComponent_1_1 Header 3H Header, 3-Pin, Right AngleLED3 Typical BLUE SiC LEDMKF 麦克风Res 电阻Res2 Resistor
上传时间： 2021-11-17
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AT89S52-24单片机最小系统开发板ALTIUM设计硬件原理图+PCB文件,2层板设计，大小为121x149mm，Altium Designer 设计的工程文件，包括完整的原理图及PCB文件，可以用Altium(AD)软件打开或修改，可作为你的产品设计的参考。主要器件型号列表如下：Library Component Count : 14Name Description----------------------------------------------------------------------------------------------------AT89S52-P 8 位微处理器/40引脚CAP CapacitorCAPACITOR POL CapacitorCRYSTAL CrystalD Connector 9 Receptacle Assembly, 9 Position, Right AngleHeader 2 Header, 2-PinHeader 4 Header, 4-PinHeader 5X2 Header, 5-Pin, Dual rowLED MAX232PZ_9 排针——9RES2SW-DPST Double-Pole, Single-Throw SwitchSW-PB Switch
上传时间： 2021-11-17
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AT89S52单片机主8入8出继电器工控主板ALTIUM设计硬件原理图+PCB文件,2层板设计，大小为121x149mm，Altium Designer 设计的工程文件，包括完整的原理图及PCB文件，可以用Altium(AD)软件打开或修改，可作为你的产品设计的参考。主要器件型号列表如下：Library Component Count : 25Name Description----------------------------------------------------------------------------------------------------24LC02AJKG 按键开关AT89S52-P 8 位微处理器/40引脚CAP CapacitorCAPACITOR POL CapacitorCPDR 瓷片电容CRYSTAL CrystalD Connector 9 Receptacle Assembly, 9 Position, Right AngleDG 电感DJDR 电解电容GO 光耦Header 5X2 Header, 5-Pin, Dual rowJDQYCK 继电器——1常开1常闭LED 发光二极管LM2576HVT-3.3 Simple Switcher 3A Step Down Voltage RegulatorMAX232 NPN NPN Bipolar TransistorPZ_2 排针——2PZ_3 排针——3RES2Res 电阻Res PZ_8 8位排阻SW-DPST Double-Pole, Single-Throw SwitchWY2JG 稳压二级管ZL2JG 整流二极管
上传时间： 2021-11-17
上传用户：kingwide
BTS7960大功率直流电机驱动板ALTIUM设计硬件原理图+PCB文件,2层板设计，大小为66*76mm, 包括完整的原理图和PCB工程文件，可以做为你的设计参考。主要器件如下：Library Component Count : 13Name Description----------------------------------------------------------------------------------------------------CPDR 瓷片电容Component_1_1 DG 电感DJDR 电解电容Header 2 Header, 2-PinLED 发光二极管LED3 Typical BLUE SiC LEDLM2576HVT-3.3 Simple Switcher 3A Step Down Voltage RegulatorPZ_2 排针——2RES2 Res 电阻TLP521-1WY2JG 稳压二级管
上传时间： 2021-11-21
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