Version 4
SHEET 1 2024 848
WIRE -96 -96 -208 -96
WIRE 32 -96 -96 -96
WIRE 112 -96 32 -96
WIRE 912 -96 192 -96
WIRE 1024 -96 912 -96
WIRE 1104 -96 1024 -96
WIRE 1296 -96 1184 -96
WIRE 1296 -80 1296 -96
WIRE -208 -64 -208 -96
WIRE 912 -64 912 -96
WIRE 1024 -48 1024 -96
WIRE -208 32 -208 0
WIRE 32 32 32 -96
WIRE 912 32 912 0
WIRE 1296 32 1296 0
WIRE -96 48 -96 -96
WIRE 976 96 912 96
WIRE 1120 96 976 96
WIRE 1248 96 1184 96
WIRE 1296 96 1248 96
WIRE 256 112 144 112
WIRE 608 112 256 112
WIRE 256 144 256 112
WIRE 608 160 608 112
WIRE 912 160 912 96
WIRE 144 176 144 112
WIRE 32 192 32 32
WIRE -208 240 -256 240
WIRE -96 240 -96 128
WIRE -96 240 -144 240
WIRE -64 240 -96 240
WIRE -32 240 -64 240
WIRE 1024 240 1024 32
WIRE 256 288 256 224
WIRE 384 288 256 288
WIRE 512 288 448 288
WIRE 704 288 512 288
WIRE 816 288 784 288
WIRE 912 288 912 240
WIRE 912 288 880 288
WIRE 944 288 912 288
WIRE 960 288 944 288
WIRE -256 320 -256 240
WIRE 256 352 256 288
WIRE 608 352 608 224
WIRE 32 368 32 288
WIRE 80 368 32 368
WIRE 144 368 144 240
WIRE 144 368 80 368
WIRE 400 384 288 384
WIRE 512 384 512 288
WIRE 512 384 480 384
WIRE 576 384 512 384
WIRE -256 416 -256 320
WIRE 1024 432 1024 336
WIRE 256 480 256 416
WIRE 384 480 256 480
WIRE 512 480 512 384
WIRE 512 480 448 480
WIRE -96 528 -96 240
WIRE 32 528 32 368
WIRE 256 528 256 480
WIRE 1024 528 1024 432
WIRE 1248 528 1248 96
WIRE 608 544 608 416
WIRE -256 640 -256 496
WIRE -96 640 -96 608
WIRE 32 640 32 608
WIRE 256 640 256 608
WIRE 608 640 608 608
WIRE 1024 640 1024 608
WIRE 1248 640 1248 608
FLAG 1024 640 0
FLAG 256 640 0
FLAG 608 640 0
FLAG -96 640 0
FLAG 32 640 0
FLAG -256 640 0
FLAG 1248 640 0
FLAG 1296 96 out
IOPIN 1296 96 Out
FLAG -208 32 0
FLAG 912 32 0
FLAG 1296 32 0
FLAG -256 320 in
FLAG 80 368 e1
FLAG 1024 432 e2
FLAG 976 96 c2
FLAG 944 288 b2
FLAG -64 240 b1
FLAG 32 32 c1
SYMBOL npn -32 192 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL res -112 32 R0
SYMATTR InstName R1
SYMATTR Value 560k
SYMBOL res -112 512 R0
SYMATTR InstName R2
SYMATTR Value 470k
SYMBOL res 16 512 R0
SYMATTR InstName R3
SYMATTR Value 2.2k
SYMBOL res 240 128 R0
SYMATTR InstName R4
SYMATTR Value 12k
SYMBOL res 240 512 R0
SYMATTR InstName R5
SYMATTR Value 4.7k
SYMBOL res 384 400 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R6
SYMATTR Value 3.3k
SYMBOL cap 592 160 R0
SYMATTR InstName C2
SYMATTR Value 6.8n
SYMBOL cap 592 544 R0
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL cap 384 304 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL cap 384 496 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C5
SYMATTR Value 100n
SYMBOL npn 960 240 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res 1008 -64 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 896 144 R0
SYMATTR InstName R8
SYMATTR Value 2.7e6
SYMBOL res 1008 512 R0
SYMATTR InstName R9
SYMATTR Value 2.2k
SYMBOL cap -208 256 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C8
SYMATTR Value 470n
SYMBOL res 1232 512 R0
SYMATTR InstName R10
SYMATTR Value 1e6
SYMBOL voltage -256 400 R0
WINDOW 123 10 102 Left 0
WINDOW 39 6 133 Left 0
WINDOW 0 -25 55 Left 0
WINDOW 3 12 56 Left 0
SYMATTR Value2 AC 1
SYMATTR SpiceLine Rser=600
SYMATTR InstName Vs
SYMATTR Value 0
SYMBOL polcap 880 272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C9
SYMATTR Value 10µ
SYMBOL polcap 896 -64 R0
SYMATTR InstName C10
SYMATTR Value 470µ
SYMBOL polcap 128 240 M180
WINDOW 0 24 57 Left 0
WINDOW 3 24 8 Left 0
SYMATTR InstName C11
SYMATTR Value 10µ
SYMBOL polcap -224 -64 R0
SYMATTR InstName C12
SYMATTR Value 100µ
SYMBOL res 96 -80 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL Misc\\battery 1296 -96 R0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 1088 -80 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R12
SYMATTR Value 560
SYMBOL polcap 1120 112 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL res 688 304 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R13
SYMATTR Value 8.2k
SYMBOL Robertugo\\Pote 592 320 R0
WINDOW 123 86 96 Center 0
SYMATTR InstName Treble
SYMATTR Value Rt=47K
SYMATTR Value2 Set={w2}
SYMBOL Robertugo\\Pote 272 320 M0
WINDOW 0 -51 28 Left 0
WINDOW 3 -74 89 Left 0
WINDOW 123 -52 115 Center 0
SYMATTR InstName Bass
SYMATTR Value Rt=47K
SYMATTR Value2 Set={w1}
TEXT 56 -16 Left 0 !.op
TEXT 56 8 Left 0 !.ac dec 100 20 20k
TEXT 56 40 Left 0 !.step param w1 0 1 0.5\n.step param w2 0 1 0.05
TEXT 288 -80 Left 0 ;Tone Control Circuit\nhttp://www.zen22142.zen.co.uk/Circuits/Audio/t-ctrl.htm\nR6, C3 changed from 1.2k/33n to 4.7k/10n