Version 4
SHEET 1 1108 680
WIRE 176 -128 160 -128
WIRE 272 -128 256 -128
WIRE 368 -128 352 -128
WIRE 672 -128 656 -128
WIRE 160 -112 160 -128
WIRE 256 -112 256 -128
WIRE 352 -112 352 -128
WIRE 672 -112 672 -128
WIRE 720 64 720 32
WIRE 224 96 192 96
WIRE 240 96 224 96
WIRE 352 96 320 96
WIRE 368 96 352 96
WIRE 400 96 368 96
WIRE 496 112 464 112
WIRE 528 112 496 112
WIRE 640 112 608 112
WIRE 656 112 640 112
WIRE 224 128 224 96
WIRE 400 128 384 128
WIRE 496 144 496 112
WIRE 384 224 384 128
WIRE 496 224 496 208
WIRE 496 224 384 224
WIRE 528 224 496 224
WIRE 640 224 608 224
WIRE 720 224 720 160
WIRE 720 224 640 224
WIRE 224 256 224 208
WIRE 240 256 224 256
WIRE 352 256 352 96
WIRE 352 256 320 256
WIRE 720 256 720 224
WIRE 352 272 352 256
WIRE 352 368 352 352
WIRE 720 368 720 336
FLAG 720 368 0
FLAG 640 224 H
FLAG 432 80 0
FLAG 352 -32 0
FLAG 432 144 vcc
FLAG 640 112 b
FLAG 192 96 vcc
FLAG 272 144 pin
FLAG 272 192 0
FLAG 256 -32 0
FLAG 368 -128 pin
FLAG 160 -32 0
FLAG 352 368 0
FLAG 272 -128 vcc
FLAG 176 -128 bat
FLAG 720 32 bat
FLAG 368 96 in+
FLAG 672 -32 0
FLAG 656 -128 in+
SYMBOL Misc\\battery 160 -128 R0
WINDOW 123 24 32 Left 2
SYMATTR Value2 DC=9
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL npn 656 64 R0
SYMATTR InstName Q1
SYMATTR Value Qbd135
SYMBOL res 736 240 M0
SYMATTR InstName Rh
SYMATTR Value {rh}
SYMBOL voltage 352 -128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 20m 100n 100n 20m 50m 1)
SYMBOL res 224 112 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 224 272 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 4.87K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 336 256 R0
SYMATTR InstName R2
SYMATTR Value 2.21K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL sw 224 224 R180
SYMATTR InstName S1
SYMATTR Value pin
SYMBOL voltage 256 -128 R0
WINDOW 3 -14 118 Left 2
WINDOW 123 -14 134 Left 2
SYMATTR Value PULSE(0 5 10m 1m 1m 1 2 1)
SYMATTR Value2 DC=5
SYMATTR InstName V2
SYMBOL Opamps\\opamp2 432 176 M180
SYMATTR InstName U1
SYMATTR Value LM258_ON
SYMBOL current 672 -32 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 24 -16 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value 0
SYMATTR Value2 AC 497u
SYMBOL res 512 128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL res 624 208 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL cap 480 144 R0
SYMATTR InstName C1
SYMATTR Value 1n
TEXT 144 -264 Left 2 !.tran 60m startup
TEXT 144 -248 Left 2 !;dc V1 6 10 0.1
TEXT 144 -232 Left 2 ;.dc V2 0 3 0.1
TEXT 144 48 Left 2 ;.step param rh list 4 8
TEXT 144 -184 Left 2 !.lib BD135.LIB
TEXT 144 32 Left 2 !.param rh=4
TEXT 144 -168 Left 2 !.model pin SW(Ron=20 Roff=1Meg Vt=0.5 Vh=-.4 Lser=10n)
TEXT 360 -200 Left 2 ;.lib "http://www.onsemi.com/pub/Collateral/LM258 PSPICE MODEL.MOD"
TEXT 144 -200 Left 2 !.lib "LM258 PSPICE MODEL.MOD"
TEXT 256 -184 Left 2 ;.lib http://www.onsemi.com/pub/Collateral/BD135.LIB
TEXT 280 -264 Left 2 !;ac oct 1000 100 10Meg