描述
B類放大器
由于晶體管起始導通電壓值的存在及起始導通的非線性,B類放大器存在著交越失真,這在高質(zhì)量的HI-FI放大領(lǐng)域顯然是不允許的。所以,常將推挽式電路的兩個晶體管均施加少量偏置,使其導通角略大于1800,可避免產(chǎn)生交越失真。這種電路,導通角介于A類和B類之間,稱為AB類(甲乙類)放大器oAB類電路的效率要低于B類,只有60%~70%。但因其兼顧了A類與B類的優(yōu)點(低失真、高效率),故目前得到了廣泛的應(yīng)用。
AB類放大器
甲乙類放大器即末級放大管工作在甲乙類狀態(tài)的放大器。也叫AB類放大器。AB類屬于傳統(tǒng)的功放。也是大多數(shù)功放的類型。從功率上看,甲乙類的功率數(shù)值一般較大。但并不總是工作在最大輸出功率的狀態(tài),盡管放大類型比起純A類有所不如,只要經(jīng)過高水平的調(diào)試和校音,甲乙類放大器也可以發(fā)出美妙動人的音色。無數(shù)HIFI廠商已經(jīng)用事實證明了這點。
C類放大器
在輸入信號超過偏置點時才有電流流過晶體管(即導通角小于1800),這種放大器被稱為C類(丙類)放大器C類放大器的效率更高,但其電流波形失真太大,因而不能用于Hi-Fi放大,只能用于采用高Q值調(diào)諧回路作為負載的諧振功率放大。由于調(diào)諧回路具有濾波能力,回路電流與電壓仍然接近于正弦波形,失真很小。
D類放大器
D類功放指的是D類音頻功率放大器(有時也稱為數(shù)字功放)。通過控制開關(guān)單元的ON/OFF,驅(qū)動揚聲器的放大器稱D類放大器。D類放大器首次提出于1958年,近些年已逐漸流行起來。與一般的線性AB類功放電路相比,D類功放有效率高、體積小等特點。
從A、B、C類放大器的特性可知,影響放大器效率的主要原因是無信號時的直流功耗。工作于脈沖放大狀態(tài)的D類(J類)放大器,其工作狀態(tài)為開關(guān)放大,效率極高,理論上可達100%,實際上由于器件未達到理想狀態(tài),效率只能達到80%。95%,但這也是放大器中具有的最高效率。由于D類功放的效率高,無功損耗小,故散熱器體積也可用的較小,變壓器也不必用的那么巨大,使功放的體積、重量及成本大幅度下降,符合人們對新一代功放高效率、輕量化的追求。
D類放大器與A類和AB類放大器不同。后者接收的是模擬信號進行放大,前者則不一定。技術(shù)上是存在幾種不同做法的。 既有全程數(shù)字化的“全數(shù)字放大器”(只有數(shù)字輸入端子,無模擬輸入端),也有半程數(shù)字的“半數(shù)字化放大器”。(帶有模擬輸入端子)
D類功放是放大元件處于開關(guān)工作狀態(tài)的一種放大模式。無信號輸入時放大器處于截止狀態(tài),不耗電。工作時,靠輸入信號讓晶體管進入飽和狀態(tài),晶體管相當于一個接通的開關(guān),把電源與負載直接接通。理想晶體管因為沒有飽和壓降而不耗電,實際上晶體管總會有很小的飽和壓降而消耗部分電能。這種耗電只與晶體管特性有關(guān),而與信號輸出的大小無關(guān),所以特別有利于超大功率的場合。
產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進口品牌。 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家
GE FANUC IC697MEM735D IC697MEM735 NEW 781/782 CPU MEM
GE FANUC IC697CPM925 USPP IC697CPM925
GE FANUC IC697CPU781 NSPP IC697CPU781
GE FANUC 781 CPU IC697CPU781 **NEW**
GE Fanuc IC697CPU781-JE IC697CPU781 NEW
GE Fanuc IC697CPU781G IC697CPU781 NEW
GE Fanuc IC697CPU781E IC697CPU781 NEW
GE/Fanuc IC697CPU781-HB
GE FANUC IC697CPU781 USPP IC697CPU781
GE FANUC IC697MEM719 NSPP IC697MEM719
IC697RCM711 NEW In Stock! $2995 GE Fanuc PLC Sealed
One-day shipping available
Enlarge
GE Fanuc IC697CPU781-HC IC697CPU781
GE FANUC IC697CPU772 USPP IC697CPU772
GE FANUC IC697MEM719 USPP IC697MEM719
GE FANUC IC697MEM735 USPP IC697MEM735
*NEW SEALED* GE Fanuc IC697CMM711Q IC697CMM711-Q CMM711
60 DAYS WARRANTY! Communications Coprocessor for IC697
One-day shipping available
GE FANUC IC697GDC701 USPP IC697GDC701
GE FANUC IC697CPU782 USPP IC697CPU782
GE Fanuc 90 70 IC697BEM731 IC697BEM731T GENIUS – NIFSB
GE Fanuc SERIE 90 70 IC697CPU772L IC697CPU772 CPU
GE FANUC IC697CMM741 NSFP IC697CMM741
GE FANUC IC697BEM721 NSFP IC697BEM721
GE FANUC IC697CPU771 USPP IC697CPU771
GE Fanuc IC697CPU771 H CPU 12MHz 2k I/O New in Box NIB
GE Fanuc IC697GDC701A IC697GDC701 GRAPHIC DISPLAY
GE Fanuc IC697CPU781-JD IC697CPU781
GE Fanuc IC697CPU781C IC697CPU781
Ge FANUC IC697MEM735B IC697MEM735E IC697MEM735
GE Fanuc IC697ALG230 IC697ALG230F Analog 90-70 – NEW
GE FANUC IC697BEM763F IC697BEM763 DLAN SERIES 90 70
GE FANUC IC697RCM711 USPP IC697RCM711
GE Fanuc SERIE 90 70 MEMORY IC697MEM719A IC697MEM719
GE FANUC IC697ADC701 USPP IC697ADC701
GE Fanuc IC697CPU772 L CPU 12MHz 2k I/O + IC697MEM719
Ge Fanuc Analog Input Module IC697ALG230 NIB
GE FANUC 90 70 – IC697CPU782 IC697CPU782-JC CPU – NEW
GE FANUC IC697MEM732 USPP IC697MEM732
GE Fanuc IC697CPU771V IC697CPU771 CPU
GE FANUC IC697MEM733 NSFP IC697MEM733
GE Fanuc Series 90-70 IC697PX935-CC Free Ship
GE Fanuc IC697CSE784 JB + IC697MEM735 E CPU + Memory
GE Fanuc IC697GDC701 Graphical Display CoProcessor
*NEW SEALED* GE Fanuc IC697ALG320D IC697ALG320 Analog
GE Fanuc 90-70 PLC 10 Slot Rack IC697CPU731 9070 90/70
GE Fanuc IC697MEM732 MODULE
GE Fanuc 90-70 IC697CPU771J IC697CPU771 CPU /w MEM717B
GE Fanuc IC-697-CPU-781/?IC697CPU781 Version D
GE FANUC – IC697CPU 731-M NOS!
GE FANUC DLAN DRIVE INTERFACE IC697BEM763F 90-70 763
GE Fanuc IC697CPU771J IC697CPU771 CPU
GE Fanuc IC697CPU771E IC697CPU771 CPU
GE Fanuc IC697CPU771C IC697CPU771 CPU
GE FANUC 90-70 90 70 IC697CMM742 type 2 ETHERNET PLC
GE Fanuc IC697CPU782-GE CPU Series 9070 Module 90-70
GE FANUC IC697MEM717 USPP IC697MEM717
GE Fanuc SERIE 90 70 MEMORY IC697MEM717A IC697MEM717
GE FANUC IC697MEM733 USPP IC697MEM733
GE Fanuc IC697CPU771 V CPU 12MHz 2k I/O + IC697MEM719
GE Fanuc SERIE 90 70 MEMORY IC697MEM733D IC697MEM733
Ge FANUC IC697BEM733F IC697BEM733 REMOTE I/O NEW
GE FANUC IC697VPC462 USPP IC697VPC462
GE FANUC IC697HSC700 NSFP IC697HSC700
GE FANUC IC697ALG230 NSFP IC697ALG230
GE Fanuc IC697CPU771 J 9070 CPU 12MHz 2k IO IC697MEM715
GE FANUC IC697PCM711 NSPP IC697PCM711
GE FANUC IC697CPU771 Processor Unit
One-day shipping available
GE FANUC IC697ALG230 NSPP IC697ALG230
GE FANUC IC697CPU731 USPP IC697CPU731
GE FANUC IC697PCM711V COPROCESSOR MODULE NIB
Expedited shipping available
GE Fanuc IC-697-MDL-750/?IC697MDL750 Output
One-day shipping available
GE Fanuc IC697MEM719C Central Processor Unit
One-day shipping available
GE Fanuc SERIE 90 70 IC697PCM711W IC697PCM711 NEW
GE Fanuc IC-697-CPU-731/?IC697CPU731/IC6?97CPU731X
One-day shipping available
GE FANUC IC697CMM741 USPP IC697CMM741
GE/Fanuc IC697PWR711A
GE/Fanuc IC697PWR711J
GE FANUC 90 70 IC697CMM741 ETHERNET CONTROLLER – NEW
GE FANUC IC697ALG441 NSFP IC697ALG441
GE Fanuc IC697CPU781-JD Central Processor Unit
GE FANUC IC697HSC700 SERIES 90 70 HIGH SPEED COUNTER
Ge FANUC SERIES 90 70 IC697MDL752C IC697MDL752 NEW
GE Fanuc IC697MEM731 128K EXPANSION RAM MODULE
GE FANUC 90 70 IC697HSC700 HI-SPEED COUNTER PLC MODULE
GE FANUC IC697ALG320 USPP IC697ALG320
GE FANUC IC697MEM715 NSFP IC697MEM715
*NEW SEALED* GE Fanuc IC697PWR711L IC697PWR711 QTY
60 DAYS WARRANTY! QUANTITY 2 AVAILABLE! VERSION L
One-day shipping available
GE FANUC IC697BEM733 NSFP IC697BEM733
GE FANUC IC697ALG440 NSFP IC697ALG440
*NEW SEALED* GE Fanuc IC697PWR711H IC697PWR711 Ver H
60 DAYS WARRANTY! 90-70/ PACSystems RX7i Power Supply
One-day shipping available
GE/Fanuc IC697CPU731
GE FANUC IC697MEM715 NSPP IC697MEM715
GE FANUC IC697CMM741L IC697CMM741 IC697MDL340M
GE/Fanuc IC697CPU772L Central Processing Unit.
NEW GE Fanuc IC697ADC701J Display Coprocessor
One-day shipping available
GE Fanuc Input Analog 8PT IC697ALG230 IC697ALG230C NIB
GE FANUC IC697CPU732 USPP IC697CPU732
GE FANUC IC697ALG441 USPP IC697ALG441
GE Fanuc IC697CPU772L IC697CPU772 Processor CPU 772
60 DAYS WARRANTY! CPU 727 Version L
One-day shipping available
GE Fanuc SERIE 90 70 MEMORY IC697MEM719B IC697MEM719
GE FANUC IC697CPU731L IC697CPU731 SERIES 90 70 NEW
GE FANUC IC697ALG230/IC6?97ALG230B 8 POINT INPUT MODULE
GE FANUC IC697ALG230/IC6?97ALG230A 8 POINT INPUT MODULE
GE FANUC IC697MEM715 USPP IC697MEM715
GE Fanuc VA-5 Output Module D5C7A1 IC697MDL350C New
GE FANUC DISCRETE OUTPUT MODULE IC697-MDL-940E NEW
GE FANUC IC697CMM711 USPP IC697CMM711
GE Fanuc IC697MDL640D IC697MDL640 NEW
GE Fanuc IC-697-ALG-230/?IC697ALG230 Analog Input
One-day shipping available
GE/Fanuc IC697ALG320A
GE FANUC IC697MEM731 USPP IC697MEM731
GE Fanuc IC697CPU782-JD MODULE
GE Fanuc SERIE 90 70 IC697PCM711C IC697PCM711
GE FANUC IC697BEM731/IC6?97BEM731K I/O BUS CONTROLLER
GE Fanuc IC-697-CMM-741/?IC697CMM741
One-day shipping available
GE FANUC 90 70 IC697CMM741 ETHERNET CONTROLLER
GE FANUC IC697MDL753 NSFP IC697MDL753
NEW GE Fanuc IC697ALG320D Output Module
One-day shipping available
NEW GE Fanuc IC697BEM731 Bus Controller
One-day shipping available
GE FANUC IC697ALG320 OUTPUT MODULE 120VAC ***XLNT***
GE Fanuc IC697ALG320D OUTPUT MODULE 4POINT 90/70
GE Fanuc SERIE 90 70 INPUT IC697MDL350
*NEW* GE Fanuc IC697MDL350D IC697MDL350 Output Module
60 DAYS WARRANTY! 32P 120VAC Output Module
One-day shipping available
GE FANUC IC697BEM761 USPP IC697BEM761
GE Fanuc IC697MEM719 C CMOS 512k for 9070 CPU 77x & PCM
GE FANUC IC697BEM731 USPP IC697BEM731
GE FANUC IC697MDL350 USPP IC697MDL350
GE Fanuc A20B-1003-0870 IC697PWR711A IC697PWR711
GE FANUC CENTRAL PROCESSOR UNIT IC697MEM713C **NEW**
IC697MDL350 GE FANUC OUTPUT 120VAC – 1 YEAR WARANTY
One-day shipping available
GE Fanuc Series 90-70 Power Supply IC697PWR710 NEW
GE GENIUS 1 CHANNEL BUS CONTROLLER E 90-70 IC697BEM731T
GE Fanuc IC697PWR710A IC697PWR710 POWER S.NEW
GE FANUC HIGH LEVEL ANALOG OUTPUT CARD IC697ALG320
Expedited shipping available
*NEW SEALED* GE Fanuc IC697MDL340H IC697MDL340 16P 120V
60 DAYS WARRANTY! QTY AVAILABLE! 16P 2A/120VAC Output
One-day shipping available
GE FANUC IC697BEM713 NSFP IC697BEM713
GE Fanuc Analog Output High Level ( V & I ) IC697ALG320
*NEW SEALED* GE Fanuc IC697BEM713J IC697BEM713 BTM
60 DAYS WARRANTY! BUS TRANSMITTER MODULE VERSION J
One-day shipping available
GE FANUC IC697MDL752 USPP IC697MDL752
GE Fanuc 90 70 IC697MDL940 OUTPUT IC697MDL940 – NEW
GE Fanuc IC697MEM717 B CMOS 256k for 9070 CPU 77x & PCM
GE FANUC IC697MEM713 NSFP IC697MEM713
GE FANUC IC697PWR713 USPP IC697PWR713
GE FANUC IC697CHS782 NSFP IC697CHS782
GE FANUC IC697BEM713/IC6?97BEM713E BUS TRANSMITTER**NI?B*
GE FANUC IC697CPU731X 1C697CPU731 Processor Unit
One-day shipping available
Ge Fanuc Memory Module IC697MEM715 B #10594
GE FANUC IC697MDL250 USPP IC697MDL250
GE Fanuc IC697MDL652D MODULE
GE Fanuc IC697MEM717B Memory Module
GE FANUC OUTPUT MODULE PLC IC697MDL350D 120VAC 0.5AMP
GE FANUC IC697ALG230 USPP IC697ALG230
GE FANUC IC697BEM733 USPP IC697BEM733
GE FANUC HIGH LEVEL ANALOG INPUT CARD IC697ALG230
Expedited shipping available
GE/Fanuc IC697PWR711F Power Supply.
GE FANUC IC697MDL753 USPP IC697MDL753
IC697MDL250 GE FANUC INPUT 120VAC 1 YEAR WARANTY – NIB
One-day shipping available
GE/Fanuc IC697LMM741A
GE FANUC IC697MEM713C
GE Fanuc IC697PWR711B Series 90-70 Power Supply plc NEW
GE FANUC IC697BEM713F BUS TRANSMITTER
GE FANUC POWER SUPPLY IC697PWE711B **NEW**
GE Fanuc 90-70 IC697BEM713J IC697BEM713 Bus Transmitter
One-day shipping available
GE Fanuc SERIES 90 70 P IC697MEM715C IC697MEM715 NIB
Ge Fanuc Memory Module IC697MEM715 B #10599
GE Fanuc IC697BEM713D IC697BEM713 NEW
GE FANUC IC697MDL340 NSFP IC697MDL340
GE FANUC IC697MDL250/IC6?97MDL250C 32 POINT INPUT MODULE
GE FANUC IC697MEM713 NSPP IC697MEM713
GE Fanuc IC697ADC701 Alphanumeric Display CoProcessor
One-day shipping available
*NEW SEALED* GE Fanuc IC697MDL653E IC697MDL653 32P 24V
60 DAYS WARRANTY! QUANTITY 2 AVAILABLE!
One-day shipping available
GE FANUC IC697MDL740 NSFP IC697MDL740
GE Fanuc IC697BEM731 IC697BEM731K IC697BEM731L J E
GE FANUC BUS TRANMITTER IC697BEM713 *NEW*
GE FANUC IC697BEM711L *NEW*
GE FANUC IC697BEM713G *NEW*
GE FANUC IC697PWR711B *NEW*
GE FANUC IC697PWR711CX *NEW*
GE FANUC POWER SUPPLY IC697PWR711B *NEW*
GE FANUC POWER SUPPLY IC697PWR711B *NICE*
GE FANUC POWER SUPPLY IC697PWR711CX *NEW*
GE Fanuc IC697BEM731 IC697BEM731K IC697BEM731L J E C
GE FANUC IC697MEM713/IC6?97MEM713A MEMORY MODULE **NIB**
GE FANUC IC697MDL651 USPP IC697MDL651
GE Fanuc IC697ALG230 SERIES 90 70 ANALOG
GE/Fanuc IC697BEM713
GE/Fanuc IC697MDL250
GE FANUC POWER SUPPLY IC697PWR711 IC697PWR711 90-70 NEW
GE FANUC ETHERNET CONTROLLER EM7A2 IC697CMM41 PLC BOARD
GE FANUC IC697MDL750 NSFP IC697MDL750
GE FANUC POWER SUPPLY MODULE IC697PWR711F 100W
GE Programmable Controller Input Module IC697MDL250
GE Fanuc IC697CMM741 Ethernet Controller
One-day shipping available
GE FANUC IC697ACC700 NSFP IC697ACC700
GE FANUC IC697PWR710 USPP IC697PWR710
GE Fanuc IC697MDL240A IC697MDL240 NEW
NEW GE FANUC IC697MDL250 Input Module
One-day shipping available
GE FANUC IC697CMM74 Ethernet Communication Module
GE Fanuc IC-697-MDL-240/?IC697MDL240 NEW!!!!
One-day shipping available
GE Fanuc 90 70 IC697MDL740 OUTPUT IC697MDL740B – NEW
GE Fanuc IC697ALG230 IC697ALG230 Input Analog 90-70
GE FANUC IC697MDL740 USPP IC697MDL740
GE FANUC IC697PWR711 USPP IC697PWR711
GE FANUC IC697BEM713 USPP IC697BEM713
IC697BEM713E GE Fanuc Bus EXP Transmitter
One-day shipping available
NEW GE Fanuc IC697MDL340 Output Module
One-day shipping available
MINT GE Fanuc IC697ALG230 Input Module
One-day shipping available
GE IC 697 PWR 711 IC697PWR711 Power Supply 90-70
GE FANUC IC697CHS782 Integrators Rack Series 90-70 40
GE FANUC IC697MEM713 USPP IC697MEM713
GE FANUC BUS TRANSMITTER IC697BEM713
Expedited shipping available
GE Fanuc IC697MDL653E Input Module Used & Repaired
One-day shipping available
IC697MDL740E GE Fanuc Output Module
GE Fanuc IC697CHS790D,9-?SLOT RACK
GE FANUC IC697MDL750 LOGIC 32PT OUTPUT PLC MODULE
GE Fanuc Input Module IC697MDL653 #10597
GE FANUC IC697MDL340/IC6?97MDL340B 16POINT OUTPUT MODULE
GE Fanuc SERIE 90 70 IC697MDL740B IC697MDL740 NEW
GE FANUC IC697MDL250 SERIES 90 30
GE FANUC IC697MDL640 USPP IC697MDL640
GE FANUC 90 70 IC697MDL250 IC697MDL250 INPUT MODULE
GE FANUC IC697CHS750 USPP IC697CHS750
GE FANUC IC697MDL653 NSFP IC697MDL653
*NEW* GE Fanuc IC697MDL653E IC697MDL653 Input Module
60 DAYS WARRANTY! QUANTITY 2 AVAILABLE! 32P 24VDC Input
One-day shipping available
GE Fanuc IC-697-MDL-653/?IC697MDL653 Input Relay
One-day shipping available
GE Fanuc Output Module IC697MDL753 #10596
GE Fanuc IC-697-MDL-750/?IC697MDL750 Output
One-day shipping available
GE FANUC IC697BEM711 NSFP IC697BEM711
GE Fanuc IC697PWR711H Power Supply
One-day shipping available
GE Fanuc IC697PWR711 Power Supply
One-day shipping available
IC697BEM711G GE Fanuc Bus EXP Reciever
One-day shipping available
GE FANUC IC697CHS790 NSFP IC697CHS790
GE Fanuc IC697MDL250 Input Module
One-day shipping available
GE Fanuc IC697MEM715A Memory Module
GE Fanuc IC697BEM733 Model 70 Remote I/O Scanner
One-day shipping available
GE Fanuc IC697PCM711C IC697PCM711 Programmable Contrl
One-day shipping available
GE FANUC IC697MDL650 USPP IC697MDL650
GE FANUC IC697BEM711/IC6?97BEM711F BUS CONTROLLER**NIB?**
NEW GE Fanuc IC697PWR710 Power Supply
One-day shipping available
*NEW SEALED* GE Fanuc IC697BEM711N IC697BEM711 BRM
60 DAYS WARRANTY! QUANTITY 2 AVAILABLE! VERSION N
One-day shipping available
GE Fanuc IC697BEM713E IC697BEM713 IC697BEM713G
GE Fanuc IC697BEM713E IC697BEM713 IC697BEM713G B
GE Fanuc IC697MDL753 C Output 32 Point 5-48Volt DC NIB
GE Fanuc IC697BEM711G IC697BEM711 NEW
GE FANUC IC697MDL653B 32 POINT INPUT MODULE ***XLNT***
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家