Version 4
SHEET 1 940 680
WIRE 448 -112 304 -112
WIRE 880 -112 448 -112
WIRE 304 -80 304 -112
WIRE 448 -80 448 -112
WIRE 880 -64 880 -112
WIRE 96 48 -32 48
WIRE 448 48 448 0
WIRE 448 48 144 48
WIRE 448 80 448 48
WIRE 544 80 448 80
WIRE 720 80 720 32
WIRE 720 80 592 80
WIRE 880 80 880 16
WIRE 448 160 448 80
WIRE 720 176 720 80
WIRE -32 208 -32 48
WIRE 32 208 -32 208
WIRE 128 208 80 208
WIRE 192 208 128 208
WIRE 304 208 304 0
WIRE 304 208 240 208
WIRE 384 208 304 208
WIRE -32 320 -32 208
WIRE 128 320 128 208
WIRE 304 320 304 208
WIRE 448 320 448 256
WIRE 544 368 496 368
WIRE 544 384 544 368
WIRE -32 448 -32 400
WIRE 128 448 128 400
WIRE 128 448 -32 448
WIRE 304 448 304 400
WIRE 304 448 128 448
WIRE 384 448 304 448
WIRE 448 448 448 400
WIRE 448 448 384 448
WIRE 544 448 544 432
WIRE 544 448 448 448
WIRE 720 448 720 256
WIRE 720 448 544 448
WIRE 384 480 384 448
FLAG 880 80 0
FLAG 384 480 0
FLAG 720 32 Vo
SYMBOL res3 -48 304 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap2 32 176 R270
WINDOW 0 -3 24 VTop 0
WINDOW 3 -51 24 VBottom 0
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL cap2 544 48 R270
WINDOW 0 -3 24 VTop 0
WINDOW 3 -51 24 VBottom 0
SYMATTR InstName C4
SYMATTR Value 4.7µ
SYMBOL cap2 576 384 R0
SYMATTR InstName C5
SYMATTR Value 470µ
SYMBOL cap2 96 16 R270
WINDOW 0 -3 24 VTop 0
WINDOW 3 -51 24 VBottom 0
SYMATTR InstName C2
SYMATTR Value 1µ
SYMBOL cap2 240 240 R90
WINDOW 0 -51 24 VBottom 0
WINDOW 3 -3 24 VTop 0
SYMATTR InstName C3
SYMATTR Value 1µ
SYMBOL npn2 384 160 R0
SYMATTR InstName Q1
SYMATTR Value BC549B
SYMBOL res3 112 304 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res3 288 304 R0
SYMATTR InstName R3
SYMATTR Value 12k
SYMBOL res3 288 -96 R0
SYMATTR InstName R4
SYMATTR Value 47k
SYMBOL res3 432 -96 R0
WINDOW 3 34 75 Left 0
SYMATTR Value 3.9k
SYMATTR InstName R5
SYMBOL res3 704 160 R0
SYMATTR InstName RL
SYMATTR Value 10k
SYMBOL Misc\\battery 880 -80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName B1
SYMATTR Value 9V
SYMBOL potentiometer2 432 304 R0
WINDOW 0 46 37 Left 0
WINDOW 3 -17 171 Left 0
SYMATTR InstName RV1
SYMATTR Value Rtot=1K wiper=.938
TEXT 240 480 Left 0 !.tran 6
TEXT 416 504 Left 0 !.include potentiometer.sub