Version 4.1
SHEET 1 1060 900
WIRE 128 80 -304 80
WIRE 160 80 128 80
WIRE 448 80 416 80
WIRE 544 80 448 80
WIRE -720 96 -768 96
WIRE -592 96 -640 96
WIRE -384 96 -592 96
WIRE 544 96 544 80
WIRE 160 112 160 80
WIRE 160 112 96 112
WIRE 240 112 160 112
WIRE -768 128 -768 96
WIRE -304 128 -304 80
WIRE 96 144 96 112
WIRE 240 144 240 112
WIRE 768 144 656 144
WIRE 832 144 768 144
WIRE -592 160 -592 96
WIRE 656 176 656 144
WIRE -384 192 -384 96
WIRE 832 192 832 144
WIRE 544 208 544 176
WIRE 544 208 448 208
WIRE -304 224 -304 208
WIRE -64 224 -304 224
WIRE 240 224 240 208
WIRE 416 224 416 80
WIRE 416 224 240 224
WIRE -768 240 -768 128
WIRE 96 240 96 208
WIRE 416 240 96 240
WIRE 544 240 544 208
WIRE -304 256 -304 224
WIRE -384 272 -512 272
WIRE 96 272 96 240
WIRE 240 272 240 224
WIRE 656 304 656 256
WIRE 832 304 832 272
WIRE 416 352 416 240
WIRE 496 352 416 352
WIRE 544 352 544 320
WIRE 544 352 496 352
WIRE -768 368 -768 320
WIRE -592 368 -592 240
WIRE -592 368 -768 368
WIRE -512 368 -512 272
WIRE -512 368 -592 368
WIRE 96 384 96 336
WIRE 160 384 96 384
WIRE 240 384 240 336
WIRE 240 384 160 384
WIRE -304 400 -304 336
WIRE -112 400 -304 400
WIRE 160 400 160 384
WIRE 160 400 -112 400
WIRE -512 416 -512 368
WIRE 496 416 496 352
WIRE -112 432 -112 400
WIRE -64 544 -64 224
WIRE 96 544 -64 544
WIRE 256 544 176 544
WIRE 448 544 448 208
WIRE 448 544 336 544
WIRE 16 592 -16 592
WIRE 272 592 96 592
WIRE 448 592 352 592
WIRE 448 656 448 592
WIRE -16 672 -16 592
WIRE -16 768 -16 672
WIRE -16 880 -16 848
FLAG -512 416 0
FLAG -768 128 Local_oscillator
FLAG 656 304 0
FLAG 768 144 out
FLAG 128 80 top
FLAG 448 80 right
FLAG 496 352 left
FLAG -16 672 audio_in
FLAG 832 304 0
FLAG 496 416 0
FLAG -112 432 0
FLAG 448 656 0
FLAG -16 880 0
SYMBOL diode 224 144 R0
SYMATTR InstName D3
SYMATTR Value IdealDiode
SYMBOL diode 224 272 R0
SYMATTR InstName D4
SYMATTR Value IdealDiode
SYMBOL diode 112 208 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value IdealDiode
SYMBOL diode 112 336 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value IdealDiode
SYMBOL ind2 -400 176 R0
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 -320 112 R0
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 -320 240 R0
SYMATTR InstName L3
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL voltage -768 224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -72 110 Left 2
SYMATTR Value PULSE(0 5 0 10n 10n 5u 10u)
SYMATTR InstName V1
SYMBOL res -608 144 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res -624 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 50R
SYMBOL ind2 528 80 R0
SYMATTR InstName L4
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 528 224 R0
SYMATTR InstName L5
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL ind2 640 160 R0
SYMATTR InstName L6
SYMATTR Value 1m
SYMATTR Type ind
SYMBOL voltage -16 752 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 0.5 1khz)
SYMBOL res 816 176 R0
SYMATTR InstName R4
SYMATTR Value 1Meg
SYMBOL res 0 608 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 25R
SYMBOL ind 352 528 R90
WINDOW 0 -5 88 VBottom 2
WINDOW 3 -35 36 VTop 2
SYMATTR InstName L7
SYMATTR Value 1H
SYMATTR Type ind
SYMBOL ind 368 576 R90
WINDOW 0 72 70 VBottom 2
WINDOW 3 40 13 VTop 2
SYMATTR InstName L8
SYMATTR Value 1H
SYMATTR Type ind
SYMBOL res 192 528 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 25R
TEXT -416 48 Left 2 !K1 L1 L2 L3 1
TEXT 536 48 Left 2 !K2 L4 L5 L6 1
TEXT -864 488 Left 2 ;click on run,\nclick on "Local_oscillator" to plot it, \nclick on the graph window, \nthen on plot settings/add plot pane\nclick on "audio_in" to plot it, \nclick on the graph window, \nthen on plot settings/add plot pane\nclick on "out" to plot it, \nclick on the graph window, then on plot view/fft\nclick on "out" then on OK,\nthe fft window will appear,\nzoom to the frequencies at about 100khz.
TEXT 464 768 Left 2 !.model IdealDiode D(Ron=1 Roff=10Meg Vfwd=.4)
TEXT 464 728 Left 2 !.tran 0 100m 10m
TEXT -400 0 Left 2 ;transformer_1
TEXT 552 0 Left 2 ;transformer_2
TEXT -864 448 Left 4 ;instructions
TEXT -832 -72 Left 5 ;Amplitude Modulation by unbalancing a balanced mixer
TEXT 224 456 Left 2 !K3 L7 L8 1
TEXT 552 520 Left 2 ;As indicated one circuit node has been \ngrounded to unbalance this mixer.\nthis causes the carrier to appear at Vout.\n \nThe transformers are created by using \nthe Spice coupling coefficient K
TEXT 200 424 Left 2 ;transformer_3
TEXT 552 424 Left 4 ;description
TEXT -352 480 Left 2 ;this node has been\ngrounded to unbalance\nthe mixer.
LINE Normal -160 400 -240 464 3
LINE Normal -160 400 -160 400 2
LINE Normal -144 336 -144 336 2
RECTANGLE Normal -240 432 -464 16 2
RECTANGLE Normal 736 384 512 16 2
RECTANGLE Normal 384 672 192 432 2