Version 4
SHEET 1 1068 680
WIRE 192 -96 -304 -96
WIRE 336 -96 192 -96
WIRE 720 -96 336 -96
WIRE 720 -48 720 -96
WIRE 192 80 192 -96
WIRE 48 96 -208 96
WIRE 160 96 48 96
WIRE 480 112 224 112
WIRE 592 112 560 112
WIRE 720 112 720 32
WIRE 896 112 720 112
WIRE 160 128 -80 128
WIRE 48 160 48 96
WIRE -208 192 -208 96
WIRE 720 192 720 112
WIRE 784 192 720 192
WIRE 896 192 848 192
WIRE 720 240 720 192
WIRE 336 256 336 -96
WIRE -80 272 -80 128
WIRE 304 272 -80 272
WIRE 480 288 368 288
WIRE 592 288 592 112
WIRE 592 288 560 288
WIRE 656 288 592 288
WIRE 48 304 48 240
WIRE 304 304 48 304
WIRE -304 384 -304 -96
WIRE -208 384 -208 272
WIRE -80 384 -80 272
WIRE 48 416 48 304
WIRE -304 528 -304 464
WIRE -208 528 -208 464
WIRE -208 528 -304 528
WIRE -80 528 -80 464
WIRE -80 528 -208 528
WIRE 48 528 48 496
WIRE 48 528 -80 528
WIRE 192 528 192 144
WIRE 192 528 48 528
WIRE 336 528 336 320
WIRE 336 528 192 528
WIRE 720 528 720 336
WIRE 720 528 336 528
WIRE -304 640 -304 528
FLAG -304 640 0
SYMBOL Opamps\\LTC6240 192 112 R0
SYMATTR InstName U1
SYMBOL voltage -304 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -80 368 R0
WINDOW 3 -94 185 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 1.2 0 1 1m 1 1)
SYMATTR InstName V2
SYMBOL Misc\\EuropeanResistor -224 176 R0
SYMATTR InstName R1
SYMATTR Value 91K
SYMBOL Misc\\EuropeanResistor 32 144 R0
SYMATTR InstName R2
SYMATTR Value 33K
SYMBOL Misc\\EuropeanResistor 32 400 R0
SYMATTR InstName R3
SYMATTR Value 180K
SYMBOL Opamps\\LTC6240 336 288 R0
SYMATTR InstName U2
SYMBOL Misc\\EuropeanResistor 704 -64 R0
SYMATTR InstName R4
SYMATTR Value 1.5K
SYMBOL voltage -208 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 1
SYMBOL Misc\\EuropeanResistor 576 96 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 27K
SYMBOL Misc\\EuropeanResistor 576 272 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 27K
SYMBOL npn 656 240 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL diode 848 176 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value 1N4148
TEXT -336 664 Left 2 !.tran 1
TEXT 904 112 Left 2 ;LED_tune
TEXT 904 192 Left 2 ;Pin7 MC13028