Version 4
SHEET 1 1176 808
WIRE 112 -256 -64 -256
WIRE 288 -256 112 -256
WIRE 432 -256 288 -256
WIRE 704 -256 432 -256
WIRE 928 -256 704 -256
WIRE 288 -224 288 -256
WIRE 432 -224 432 -256
WIRE 112 -176 112 -256
WIRE 704 -176 704 -256
WIRE 288 -64 288 -160
WIRE 432 -64 432 -144
WIRE 928 -16 928 -256
WIRE -560 32 -608 32
WIRE 112 32 112 -96
WIRE 112 32 -480 32
WIRE 416 32 112 32
WIRE 528 32 416 32
WIRE 704 32 704 -96
WIRE 704 32 592 32
WIRE 864 32 704 32
WIRE -64 160 -64 -256
WIRE 704 160 704 32
WIRE -608 208 -608 32
WIRE -560 208 -608 208
WIRE -128 208 -480 208
WIRE 928 224 928 80
WIRE 992 224 928 224
WIRE 1120 224 1056 224
WIRE 112 256 112 32
WIRE -608 272 -608 208
WIRE 416 288 416 32
WIRE -64 304 -64 256
WIRE 48 304 -64 304
WIRE -256 400 -320 400
WIRE -128 400 -176 400
WIRE -16 400 -64 400
WIRE 112 400 112 352
WIRE 928 416 928 224
WIRE 1120 416 1120 224
WIRE -320 464 -320 400
WIRE -384 480 -496 480
WIRE -352 480 -384 480
WIRE -16 512 -16 400
WIRE 32 512 -16 512
WIRE 112 512 112 464
WIRE 112 512 32 512
WIRE 192 512 112 512
WIRE -384 528 -416 528
WIRE -352 528 -384 528
WIRE -416 544 -416 528
WIRE 32 544 32 512
WIRE 192 544 192 512
WIRE -496 624 -496 480
WIRE -608 736 -608 336
WIRE 32 736 32 608
WIRE 192 736 192 624
WIRE 416 736 416 352
WIRE 704 736 704 240
WIRE 928 736 928 496
WIRE 1120 736 1120 496
WIRE -496 752 -496 704
WIRE -416 752 -416 624
WIRE -416 752 -496 752
WIRE -320 752 -320 544
WIRE -320 752 -416 752
WIRE -320 768 -320 752
FLAG 192 736 0
FLAG 32 736 0
FLAG -608 736 0
FLAG 704 736 0
FLAG 416 736 0
FLAG 928 736 0
FLAG 432 -64 0
FLAG 288 -64 0
FLAG 1120 736 0
FLAG -320 768 0
FLAG -384 480 mod
FLAG -384 528 osc
SYMBOL npn3 -128 160 R0
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL npn3 48 256 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL npn3 864 -16 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res -576 224 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 2.2Meg
SYMBOL res -576 48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 2.2Meg
SYMBOL cap -592 336 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL res 96 -192 R0
SYMATTR InstName R3
SYMATTR Value 3.3k
SYMBOL res 688 144 R0
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL res 688 -192 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL cap 528 48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 470n
SYMBOL cap 96 400 R0
SYMATTR InstName C3
SYMATTR Value 100p
SYMBOL cap 16 544 R0
SYMATTR InstName C4
SYMATTR Value 70p
SYMBOL ind 176 528 R0
SYMATTR InstName L1
SYMATTR Value 1m
SYMBOL voltage 432 -240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL cap 272 -224 R0
SYMATTR InstName C5
SYMATTR Value 100n
SYMBOL res 912 400 R0
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL cap 992 240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C6
SYMATTR Value 47µ
SYMBOL res 1104 400 R0
SYMATTR InstName R7
SYMATTR Value 64
SYMBOL cap 400 288 R0
SYMATTR InstName C7
SYMATTR Value 1n
SYMBOL voltage -416 640 R180
WINDOW 0 -60 40 Left 2
WINDOW 3 -188 8 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 1 570k)
SYMATTR Value2 AC 2
SYMBOL res -160 384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 50
SYMBOL cap -64 384 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C8
SYMATTR Value 0.1p
SYMBOL bv -320 448 R0
SYMATTR InstName B1
SYMATTR Value V=V(mod)*V(osc) * 100u
SYMBOL voltage -496 720 R180
WINDOW 0 -58 21 Left 2
WINDOW 3 -184 -11 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(1 0.7 2k)
SYMATTR Value2 AC 2
TEXT -652 792 Left 2 !.tran 0 10m 0 20n