Version 4
SHEET 1 1240 792
WIRE 608 -48 80 -48
WIRE 768 -48 608 -48
WIRE 1056 -48 768 -48
WIRE 1120 -48 1056 -48
WIRE 608 -32 608 -48
WIRE 1056 -32 1056 -48
WIRE 80 -16 80 -48
WIRE 304 48 208 48
WIRE 464 48 304 48
WIRE 208 64 208 48
WIRE 304 64 304 48
WIRE 464 64 464 48
WIRE 80 80 80 64
WIRE 1120 80 1120 -48
WIRE 608 96 608 48
WIRE 688 96 608 96
WIRE 880 96 688 96
WIRE 896 96 880 96
WIRE 992 96 976 96
WIRE 1024 96 992 96
WIRE 1088 96 1024 96
WIRE 608 112 608 96
WIRE 768 112 768 -48
WIRE 1168 112 1152 112
WIRE 1056 128 1056 48
WIRE 1088 128 1056 128
WIRE 880 144 880 96
WIRE 464 160 464 144
WIRE 496 160 464 160
WIRE 544 160 496 160
WIRE 848 160 832 160
WIRE 992 160 992 96
WIRE 1056 208 1056 128
WIRE 608 224 608 208
WIRE 688 224 608 224
WIRE 768 224 768 208
WIRE 768 224 688 224
WIRE 880 224 880 208
WIRE 304 256 304 144
WIRE 352 256 304 256
WIRE 848 256 848 160
WIRE 848 256 352 256
WIRE 304 288 304 256
WIRE 464 288 464 160
WIRE -208 304 -336 304
WIRE 1056 304 1056 288
WIRE -336 320 -336 304
WIRE -48 336 -64 336
WIRE 64 336 -48 336
WIRE 176 336 128 336
WIRE 208 336 176 336
WIRE 240 336 208 336
WIRE 576 336 528 336
WIRE 736 336 576 336
WIRE 864 336 816 336
WIRE 992 336 992 224
WIRE 992 336 864 336
WIRE 1168 336 1168 112
WIRE 1168 336 992 336
WIRE 176 352 176 336
WIRE 576 352 576 336
WIRE 864 352 864 336
WIRE -208 368 -336 368
WIRE -336 384 -336 368
WIRE 304 400 304 384
WIRE 384 400 304 400
WIRE 464 400 464 384
WIRE 464 400 384 400
WIRE 384 432 384 400
WIRE 688 432 688 224
WIRE 176 448 176 432
WIRE 576 448 576 432
WIRE 864 448 864 432
WIRE 912 448 864 448
WIRE 1008 448 992 448
WIRE 1056 448 1008 448
WIRE 1088 448 1056 448
WIRE 864 464 864 448
WIRE 1008 464 1008 448
WIRE -336 480 -336 464
WIRE 496 480 448 480
WIRE 624 480 496 480
WIRE 496 528 496 480
WIRE 384 544 384 528
WIRE 688 544 688 528
WIRE 864 544 864 528
WIRE 1008 544 1008 528
WIRE 384 640 384 624
WIRE 496 640 496 608
WIRE 496 640 384 640
WIRE 688 640 688 624
WIRE 688 640 496 640
WIRE 1120 640 1120 144
WIRE 1120 640 688 640
WIRE 688 672 688 640
WIRE 688 768 688 752
FLAG -336 480 0
FLAG -336 320 0
FLAG 80 80 0
FLAG -48 336 IF
FLAG 176 448 0
FLAG 576 448 0
FLAG 688 768 0
FLAG 352 256 Q1C
FLAG 496 160 Q2C
FLAG 1024 96 U1M
FLAG 1056 304 0
FLAG 880 224 0
FLAG 576 336 Q2B
FLAG 1056 448 Audio
FLAG 208 336 Q1B
FLAG 688 96 Q3C
FLAG 208 144 0
FLAG 864 544 0
FLAG 1008 544 0
SYMBOL SpecialFunctions\\modulate -208 304 R0
WINDOW 39 16 64 Left 0
WINDOW 40 16 92 Left 0
WINDOW 3 16 -20 Left 0
WINDOW 123 16 8 Left 0
SYMATTR SpiceLine mark=455k
SYMATTR SpiceLine2 space=455k
SYMATTR Value Rout=220
SYMATTR Value2 Vhigh={ifampl} Vlow=0
SYMATTR InstName A1
SYMBOL voltage -336 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -2 -17 Left 0
WINDOW 3 40 65 Left 0
SYMATTR InstName Modulation
SYMATTR Value SINE(1v {moddepth} 1000)
SYMBOL voltage 80 -32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12V
SYMBOL NPN 240 288 R0
SYMATTR InstName Q1
SYMATTR Value 2N2369
SYMBOL NPN 528 288 M0
SYMATTR InstName Q2
SYMATTR Value 2N2369
SYMBOL NPN 544 112 R0
SYMATTR InstName Q3
SYMATTR Value 2N2369
SYMBOL NPN 832 112 M0
SYMATTR InstName Q4
SYMATTR Value 2N2369
SYMBOL cap 128 320 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value 10nf
SYMBOL res 160 336 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 560 336 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL voltage 688 768 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 33 30 Left 0
WINDOW 3 36 72 Left 0
SYMATTR InstName V1
SYMATTR Value 6v
SYMBOL res 368 528 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 448 48 R0
SYMATTR InstName R5
SYMATTR Value 170
SYMBOL res 288 48 R0
SYMATTR InstName R6
SYMATTR Value 170
SYMBOL res 592 -48 R0
SYMATTR InstName R8
SYMATTR Value 22k
SYMBOL res 1040 -48 R0
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL res 1040 192 R0
SYMATTR InstName R11
SYMATTR Value 3k
SYMBOL res 832 320 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R12
SYMATTR Value 4.7k
SYMBOL cap 864 144 R0
SYMATTR InstName C3
SYMATTR Value 1n
SYMBOL cap 976 160 R0
SYMATTR InstName C4
SYMATTR Value 1nf
SYMBOL res 992 80 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL NPN 448 432 M0
SYMATTR InstName Q5
SYMATTR Value 2N2369
SYMBOL NPN 624 432 R0
SYMATTR InstName Q6
SYMATTR Value 2N2369
SYMBOL res 672 528 R0
SYMATTR InstName R4
SYMATTR Value 270
SYMBOL voltage 496 512 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 33 30 Left 0
WINDOW 3 36 72 Left 0
SYMATTR InstName V3
SYMATTR Value 3.7V
SYMBOL voltage 208 48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 33 30 Left 0
WINDOW 3 36 72 Left 0
SYMATTR InstName V4
SYMATTR Value 6V
SYMBOL res 848 336 R0
SYMATTR InstName R9
SYMATTR Value 5k
SYMBOL cap 848 464 R0
SYMATTR InstName C5
SYMATTR Value 1n
SYMBOL res 1008 432 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R13
SYMATTR Value 5k
SYMBOL cap 992 464 R0
SYMATTR InstName C6
SYMATTR Value 1n
SYMBOL Robertugo\\OPAMP5 1120 48 R0
WINDOW 0 -28 62 Left 0
WINDOW 38 -64 118 Left 0
SYMATTR InstName U2
SYMATTR SpiceModel 2pole
TEXT -216 680 Left 0 !.fourier 1k V(Audio)
TEXT -216 640 Left 0 !.tran 0 2m 0
TEXT -216 504 Left 0 !.options plotwinsize=0
TEXT 120 -104 Left 0 ;'Constant Duty Cycle Peak Detector 0.073338% THD\nUS Patent 4,603,299
TEXT -264 72 Left 0 ;Simulated DSB-AM \nsignal at 455kHz IF
TEXT -256 128 Left 0 ;DC Offset: \n	1V for DSB AM with carrier\n	0V for DSB AM suppressed carrier\nAmplitude(V)=%modulation/100
TEXT -216 584 Left 0 !.param moddepth=0.95 ; modulation depth 1 = 100%
TEXT -216 536 Left 0 !.IC V(U1M)=9v
TEXT -216 560 Left 0 !.IC V(Audio)=0v
TEXT -216 704 Left 0 !.step param ifampl list 0.0625 0.5 1.0 2.0 2.5 2.6 2.7
TEXT -216 608 Left 0 !.param ifampl=1.0