Version 4.1
SHEET 1 1156 984
WIRE -928 -16 -1040 -16
WIRE -688 -16 -848 -16
WIRE -384 -16 -688 -16
WIRE -144 -16 -304 -16
WIRE -48 -16 -144 -16
WIRE 64 -16 16 -16
WIRE 368 -16 64 -16
WIRE -1040 0 -1040 -16
WIRE -384 0 -384 -16
WIRE -304 0 -304 -16
WIRE 64 64 64 -16
WIRE -1040 144 -1040 80
WIRE -448 144 -1040 144
WIRE -384 144 -384 80
WIRE -384 144 -448 144
WIRE -448 160 -448 144
WIRE 64 176 64 144
WIRE -912 192 -1024 192
WIRE -704 192 -832 192
WIRE -304 192 -304 80
WIRE -304 192 -704 192
WIRE -1024 208 -1024 192
WIRE -1024 304 -1024 288
WIRE -304 304 -1024 304
WIRE -304 320 -304 304
FLAG -448 160 0
FLAG -704 192 Local_oscillator_input
FLAG -688 -16 Audio_input
FLAG -144 -16 Audio+RF
FLAG 368 -16 RF_output
FLAG 64 176 0
FLAG -304 320 0
SYMBOL diode -48 0 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value IdealDiode
SYMBOL ind2 -400 -16 R0
SYMATTR InstName L1
SYMATTR Value 100m
SYMATTR Type ind
SYMBOL ind2 -320 -16 R0
SYMATTR InstName L2
SYMATTR Value 100m
SYMATTR Type ind
SYMBOL voltage -1024 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -39 103 Left 2
SYMATTR Value PULSE(0 1 0 10n 10n 5u 10u)
SYMATTR InstName V2
SYMBOL res -944 -32 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100R
SYMBOL voltage -1040 -16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 200m 1k)
SYMBOL res 48 48 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res -928 176 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10R
TEXT -408 -80 Left 2 !K1 L1 L2 1
TEXT 72 520 Left 2 !.model IdealDiode D(Ron=1 Roff=10Meg Vfwd=.4)
TEXT 72 472 Left 2 !.tran 0 100m 50m 10n
TEXT -1032 -456 Left 5 ;Unbalanced single diode mixer as an AM modulator
TEXT -728 400 Left 4 ;instructions
TEXT -728 432 Left 2 ;click on run,\nclick on "Local_oscillator_input" to plot it, \nclick on the graph window, then on plot settings/add plot pane\nclick on "Audio_input" to plot it, \nclick on the graph window, then on plot settings/add plot pane\nclick on "Audio+RF" to plot it, \nclick on the graph window, then on plot settings/add plot pane\nclick on "RF_output" to plot it, \nwait for the sim to finish before using the fft\nclick on the graph window, then on view/fft\nclick on "RF_output" then on OK,\nthe fft window will appear,\nwith this simple 1 diode mixer the sidebands are present at 99 and 101khz\nbut so is the 100khz carrier, hence we call it AM.
TEXT -416 -104 Left 2 ;transformer_1
TEXT -1008 -192 Left 4 ;Inputs
TEXT -296 -192 Left 4 ;Mixer
TEXT -1016 -400 Left 2 ;this simple mixer circuit is included as an introduction to diode mixers.\nas it is not balanced the output includes the carrier and both sidebands\nor in other words AM.\nIt may not be the most effective way of producing AM\nsee class D power amps for that.\nfor mixers that don't include the carrier on the output see the 2 and 4 diode mixers.
TEXT -1008 -584 Left 2 ;Mixer circuit with one diode, \n this type of mixer circuit produces the desired sum and difference frequencies at its output, \n however it also produces its two input frequencies at its output
RECTANGLE Normal -672 336 -1152 -160 2
RECTANGLE Normal 144 352 -544 -160 2