Version 4
SHEET 1 1324 680
WIRE -224 -256 -624 -256
WIRE -624 -208 -624 -256
WIRE 224 -208 -624 -208
WIRE -224 -176 -224 -256
WIRE -224 -176 -384 -176
WIRE -48 -176 -224 -176
WIRE -624 -144 -624 -208
WIRE -384 -96 -384 -176
WIRE -48 -96 -48 -176
WIRE 256 -64 240 -64
WIRE 368 -64 320 -64
WIRE 752 -16 720 -16
WIRE 960 -16 832 -16
WIRE -48 32 -48 -16
WIRE 240 32 240 -64
WIRE 256 32 240 32
WIRE 368 32 368 -64
WIRE 368 32 336 32
WIRE -624 96 -624 -64
WIRE -624 96 -672 96
WIRE -624 112 -624 96
WIRE -544 112 -624 112
WIRE -672 128 -672 96
WIRE 224 128 224 -208
WIRE 304 128 224 128
WIRE 800 128 304 128
WIRE -384 144 -384 -16
WIRE 48 144 -384 144
WIRE 304 176 304 128
WIRE 800 176 800 128
WIRE 128 192 128 144
WIRE 160 192 128 192
WIRE 240 192 240 32
WIRE 240 192 160 192
WIRE 272 192 240 192
WIRE 768 192 656 192
WIRE 368 208 368 32
WIRE 368 208 336 208
WIRE 464 208 368 208
WIRE 640 208 640 -16
WIRE 640 208 544 208
WIRE 656 208 656 192
WIRE 656 208 640 208
WIRE 896 208 832 208
WIRE 960 208 960 -16
WIRE 1040 208 960 208
WIRE 208 224 128 224
WIRE 240 224 208 224
WIRE 272 224 240 224
WIRE 768 224 720 224
WIRE -48 272 -48 112
WIRE 48 272 -48 272
WIRE 128 272 128 224
WIRE 640 288 640 208
WIRE -624 320 -624 112
WIRE -384 320 -384 144
WIRE -48 320 -48 272
WIRE 160 320 160 192
WIRE 240 320 240 224
WIRE 160 416 160 384
WIRE 208 416 208 224
WIRE 208 416 160 416
WIRE -624 432 -624 400
WIRE -576 432 -624 432
WIRE -384 448 -384 400
WIRE -208 448 -384 448
WIRE -48 448 -48 400
WIRE -48 448 -208 448
WIRE 240 448 240 400
WIRE 640 448 640 352
WIRE 640 448 240 448
WIRE 720 448 720 224
WIRE 720 448 640 448
WIRE -544 480 -544 112
WIRE -208 480 -208 448
WIRE -208 480 -544 480
WIRE -576 496 -576 432
WIRE 304 496 304 240
WIRE 304 496 -576 496
WIRE 800 496 800 240
WIRE 800 496 304 496
WIRE 640 528 640 448
FLAG 1040 208 OUT
IOPIN 1040 208 Out
FLAG -672 128 0
FLAG 640 528 0
SYMBOL res -400 -112 R0
SYMATTR InstName PT68_M_1020
SYMATTR Value 11
SYMBOL res -400 304 R0
SYMATTR InstName R3
SYMATTR Value 25
SYMBOL res -64 -112 R0
SYMATTR InstName R1_Trimmer
SYMATTR Value 1.7k
SYMBOL res -64 16 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res -64 304 R0
SYMATTR InstName R4
SYMATTR Value 8k
SYMBOL res 224 304 R0
SYMATTR InstName R7
SYMATTR Value 11k
SYMBOL res 144 128 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R5
SYMATTR Value 8k
SYMBOL res 144 256 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R6
SYMATTR Value 8k
SYMBOL res 352 16 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R8
SYMATTR Value 11k
SYMBOL res 560 192 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R9
SYMATTR Value 3.3k
SYMBOL diode 896 224 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D1
SYMBOL res 736 0 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 624 0 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R10_Trimmer
SYMATTR Value 20k
SYMBOL voltage -624 -160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 8
SYMBOL voltage -624 304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 4
SYMBOL cap 320 -80 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value 820p
SYMBOL cap 144 320 R0
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL Opamps\\UniversalOpamp2 304 208 R0
SYMATTR InstName LM324_1
SYMBOL Opamps\\UniversalOpamp2 800 208 R0
SYMATTR InstName LM324_2
SYMBOL cap 624 288 R0
SYMATTR InstName C3
SYMATTR Value 10p
TEXT -696 456 Left 0 !.tran 2s