Version 4
SHEET 1 1540 680
WIRE 1120 -48 640 -48
WIRE 1008 80 976 80
WIRE 1120 80 1120 -48
WIRE 1120 80 1088 80
WIRE -144 112 -224 112
WIRE 64 112 -144 112
WIRE 272 112 64 112
WIRE 352 112 272 112
WIRE 640 112 640 -48
WIRE 640 112 352 112
WIRE -144 128 -144 112
WIRE 64 128 64 112
WIRE 272 128 272 112
WIRE 400 160 384 160
WIRE 640 160 640 112
WIRE 640 160 624 160
WIRE 1008 176 976 176
WIRE 1120 176 1120 80
WIRE 1120 176 1088 176
WIRE 1424 192 1344 192
WIRE 272 224 272 208
WIRE 400 224 272 224
WIRE 640 224 624 224
WIRE 736 224 640 224
WIRE 816 224 736 224
WIRE 1120 224 1120 176
WIRE 1152 224 1120 224
WIRE 1264 224 1232 224
WIRE 1312 224 1264 224
WIRE 1424 224 1424 192
WIRE 1424 224 1376 224
WIRE -144 240 -144 208
WIRE -48 240 -144 240
WIRE 64 240 64 208
WIRE 64 240 -32 240
WIRE -48 256 -48 240
WIRE -32 256 -32 240
WIRE 1008 272 976 272
WIRE 1120 272 1120 224
WIRE 1120 272 1088 272
WIRE -224 288 -224 112
WIRE 272 288 272 224
WIRE 400 288 368 288
WIRE 640 288 640 224
WIRE 640 288 624 288
WIRE 736 288 736 224
WIRE -144 320 -144 240
WIRE 1264 320 1264 224
WIRE 1312 320 1264 320
WIRE -48 336 -48 320
WIRE 96 336 -48 336
WIRE 208 336 176 336
WIRE 352 352 352 112
WIRE 400 352 352 352
WIRE 640 352 624 352
WIRE 1264 352 1264 320
WIRE -48 368 -48 336
WIRE 64 368 64 240
WIRE 640 368 640 352
WIRE 1008 368 976 368
WIRE 1120 368 1120 272
WIRE 1120 368 1088 368
WIRE 496 384 448 384
WIRE 496 400 496 384
WIRE 368 432 368 288
WIRE 448 432 448 384
WIRE 448 432 368 432
WIRE 464 432 448 432
WIRE 608 432 528 432
WIRE -224 464 -224 368
WIRE -144 464 -144 384
WIRE -144 464 -224 464
WIRE -48 464 -48 448
WIRE -48 464 -144 464
WIRE 64 464 64 448
WIRE 64 464 -48 464
WIRE 272 464 272 384
WIRE 272 464 64 464
WIRE 384 464 384 160
WIRE 384 464 272 464
WIRE 640 464 640 432
WIRE 640 464 384 464
WIRE 736 464 736 352
WIRE 736 464 640 464
WIRE 1008 464 976 464
WIRE 1120 464 1120 368
WIRE 1120 464 1088 464
WIRE 1264 464 1264 432
WIRE 1312 464 1264 464
WIRE -224 480 -224 464
WIRE 1424 480 1424 224
WIRE 608 496 608 432
WIRE 1264 496 1264 464
WIRE 1264 496 608 496
FLAG -224 480 0
FLAG 1424 480 0
FLAG 1312 320 neg
IOPIN 1312 320 Out
FLAG 1312 464 pos
IOPIN 1312 464 Out
SYMBOL put -64 256 R0
WINDOW 38 34 61 Left 0
SYMATTR SpiceModel 6028
SYMATTR InstName U1
SYMBOL res -160 112 R0
WINDOW 0 -26 31 Left 0
WINDOW 3 -32 63 Left 0
SYMATTR InstName R1
SYMATTR Value 1e6
SYMBOL cap -160 320 R0
WINDOW 0 -37 47 Left 0
WINDOW 3 -33 77 Left 0
SYMATTR InstName C1
SYMATTR Value 2n5
SYMBOL res -64 352 R0
WINDOW 0 -22 27 Left 0
WINDOW 3 -24 67 Left 0
SYMATTR InstName R2
SYMATTR Value 56
SYMBOL res 48 112 R0
WINDOW 0 -32 31 Left 0
WINDOW 3 -43 66 Left 0
SYMATTR InstName R3
SYMATTR Value 22k
SYMBOL res 48 352 R0
WINDOW 0 -28 29 Left 0
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL voltage -224 272 R0
WINDOW 0 7 12 Left 0
WINDOW 3 -12 62 Left 0
SYMATTR InstName Vcc
SYMATTR Value 12
SYMBOL npn2 208 288 R0
WINDOW 0 24 49 Left 0
WINDOW 3 -28 -9 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N4124
SYMBOL res 192 320 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R5
SYMATTR Value 2k2
SYMBOL res 256 112 R0
WINDOW 0 -32 31 Left 0
WINDOW 3 -43 66 Left 0
SYMATTR InstName R6
SYMATTR Value 12k
SYMBOL Robertugo\\555_ALL 560 272 R0
SYMATTR InstName U2
SYMBOL cap 624 368 R0
WINDOW 0 22 11 Left 0
WINDOW 3 18 67 Left 0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL Pot&Sw\\sw_5_to_1 880 176 M0
WINDOW 0 96 -168 Left 0
SYMATTR InstName U3
SYMATTR Value sel={sw}
SYMBOL res 1104 64 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value 1e7
SYMBOL res 1104 160 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R8
SYMATTR Value 1e6
SYMBOL res 1104 256 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R9
SYMATTR Value 1e5
SYMBOL res 1104 352 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R10
SYMATTR Value 1e4
SYMBOL res 1104 448 R90
WINDOW 0 -2 109 VBottom 0
WINDOW 3 -25 11 VTop 0
SYMATTR InstName R11
SYMATTR Value 1e3
SYMBOL res 1248 208 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R12
SYMATTR Value 4k7
SYMBOL Robertugo\\Pote 1408 208 R90
WINDOW 0 57 20 VRight 0
WINDOW 3 57 60 VRight 0
WINDOW 123 -16 121 VCenter 0
SYMATTR InstName U5
SYMATTR Value Rt=100
SYMATTR Value2 Set=1m
SYMBOL Robertugo\\Pote 560 416 R90
WINDOW 0 -20 8 VRight 0
WINDOW 3 0 -57 VRight 0
WINDOW 123 34 -9 VCenter 0
SYMATTR InstName U10
SYMATTR Value Rt=100k
SYMATTR Value2 Set=.45
SYMBOL cap 720 288 R0
SYMATTR InstName Cx
SYMATTR Value {cx}
SYMBOL res 1280 448 R180
WINDOW 0 36 76 Left 0
WINDOW 3 47 40 Left 0
SYMATTR InstName Rinst
SYMATTR Value 10k
TEXT 104 88 Left 0 !.tran 0 20m 1m 1u
TEXT 392 88 Left 0 !.params: sw=5 cx=1u
TEXT -240 -40 Left 0 ;Rinst es la resistencia de un microamperímetro,de 100uA. El rango de medida es\n1pF a 1u. Si se aumenta C1 a 25n, pueden medirse capacitores de hasta 10uF.