Version 4.1
SHEET 1 2100 1024
WIRE -144 224 -240 224
WIRE 80 224 -64 224
WIRE 96 224 80 224
WIRE 304 224 96 224
WIRE -240 256 -240 224
WIRE 96 272 96 224
WIRE 304 336 304 224
WIRE -240 368 -240 336
WIRE 96 384 96 352
WIRE 144 384 96 384
WIRE 240 384 144 384
WIRE 96 416 96 384
WIRE 304 464 304 432
WIRE -400 560 -448 560
WIRE -256 560 -320 560
WIRE 96 560 96 480
WIRE 96 560 -256 560
WIRE 304 560 304 544
WIRE 560 560 304 560
WIRE 608 560 560 560
WIRE 304 592 304 560
WIRE 560 592 560 560
WIRE -448 624 -448 560
WIRE 96 640 96 560
WIRE 304 704 304 672
WIRE 560 720 560 672
WIRE -448 752 -448 704
WIRE -208 752 -272 752
WIRE 96 752 96 704
WIRE 160 752 96 752
WIRE 240 752 160 752
WIRE -272 768 -272 752
WIRE -208 800 -208 752
WIRE 96 800 96 752
WIRE -208 912 -208 880
WIRE -80 912 -208 912
WIRE 96 912 96 880
WIRE 96 912 0 912
WIRE 304 912 304 800
WIRE 304 912 96 912
FLAG 608 560 output
FLAG -256 560 input
FLAG 80 224 Vsupply
FLAG 144 384 Q1_base
FLAG -448 752 0
FLAG -240 368 0
FLAG -272 768 0
FLAG 560 720 0
FLAG 160 752 Q2_base
SYMBOL res 80 256 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL npn 240 336 R0
SYMATTR InstName Q1
SYMATTR Value FZT849
SYMBOL res 288 448 R0
SYMATTR InstName R_emmitter_1
SYMATTR Value 0.1R
SYMBOL voltage -240 240 R0
SYMATTR InstName V1
SYMATTR Value 15V
SYMBOL voltage -448 608 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 42 56 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 10 100k)
SYMBOL pnp 240 800 M180
SYMATTR InstName Q2
SYMATTR Value 2SAR562F3
SYMBOL diode 80 416 R0
SYMATTR InstName D1
SYMBOL diode 80 640 R0
SYMATTR InstName D2
SYMBOL res 288 576 R0
SYMATTR InstName R_emmitter_2
SYMATTR Value 0.1R
SYMBOL voltage -208 784 R0
SYMATTR InstName V2
SYMATTR Value 15V
SYMBOL res -304 544 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100R
SYMBOL res 80 784 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 544 576 R0
SYMATTR InstName R_load
SYMATTR Value 5R
SYMBOL res -160 208 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_Isense_P
SYMATTR Value 1m
SYMBOL res 16 896 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_Isense_N
SYMATTR Value 1m
TEXT -344 -136 Left 6 ;class B Amplifier
TEXT -496 -16 Left 2 !.tran 0.1m
TEXT 392 -80 Left 4 ;instructions
TEXT 368 -40 Left 2 ;click on run\nthen click on "input" to plot it.\nthen click on the plot window then on plot settings / add plot pane\nthen click on "output" to plot it\nthen click on the plot window and plot settings/add plot pane\nthen hold the ALT key hover over R-Load and click, \nthis will plot the power dissipated in it.\nclick on the plot window, then hold the cntrl key and click on the "V(output)*I(R_load)" title\nthis will bring up its average value (about 6W).\nthen click on the plot window and plot settings/add plot pane\nthen hover the mouse over "R_Isense_P" to plot its current\nclick on the plot window, then hold the cntrl key and click on the "I(R_Isense_P)" title\nthis will bring up its average value (about 0.6A).\ncalculate 2 x 15V x this 0.6A... this gives about 18W.\nthis means this class B amplifier is 33% efficient with this input voltage.