Index # 3D TV, 264-265 A AC . See Alternating current Accumulator in ALU , 130 register , 129­130 Actuator , 289­298 . See also Motor ; Relay ; Solenoid ADC . See Analog-to-digital converter Address buffer , 131 , 132f Address bus , 135 Address register, memory , 131 , 132f Addressing, in RAM , 113f control codes of , 94­97 Ampere , 18­19 Amplifier , 7­8 , 52 , 62­63 , 69­73 audio frequency , 63 BJT , 53f cascading , 71­72 , 71f , 72f class A , 64 , 64f class AB , 65 class B , 65 , 65f class C , 65 , 66 , 66f class D , 66­67 , 67f class E , 68 class F , 68 classification of , 63­69 , 64­68 configuration of , 63­64 DC , 63 differential , 64 , 64f , 68f