Version 4
SHEET 1 1068 784
WIRE -352 -32 -512 -32
WIRE -208 -32 -352 -32
WIRE -352 16 -352 -32
WIRE -208 16 -208 -32
WIRE -512 32 -512 -32
WIRE 224 96 192 96
WIRE 368 96 304 96
WIRE -512 128 -512 112
WIRE -448 128 -512 128
WIRE -512 144 -512 128
WIRE -448 144 -448 128
WIRE -352 192 -352 96
WIRE 192 192 192 96
WIRE 192 192 -352 192
WIRE 256 192 192 192
WIRE 368 208 368 96
WIRE 368 208 320 208
WIRE 464 208 368 208
WIRE 496 208 464 208
WIRE -208 224 -208 96
WIRE 64 224 -208 224
WIRE 256 224 64 224
WIRE -352 256 -352 192
WIRE -208 256 -208 224
WIRE 64 256 64 224
WIRE -416 304 -448 304
WIRE -112 304 -144 304
WIRE -112 336 -112 304
WIRE -352 400 -352 352
WIRE -272 400 -352 400
WIRE -208 400 -208 352
WIRE -208 400 -272 400
WIRE -448 448 -448 304
WIRE 112 448 -448 448
WIRE 144 448 112 448
WIRE 240 448 144 448
WIRE 256 448 240 448
WIRE 336 448 320 448
WIRE 352 448 336 448
WIRE 464 448 464 208
WIRE 464 448 432 448
WIRE 144 480 144 448
WIRE 240 480 240 448
WIRE -272 496 -272 400
WIRE -512 608 -512 224
WIRE -272 608 -272 576
WIRE -272 608 -512 608
FLAG 144 560 0
FLAG 240 544 0
FLAG 496 208 out
IOPIN 496 208 Out
FLAG 336 448 1
FLAG 112 448 2
FLAG -448 144 0
FLAG -112 336 0
FLAG 64 336 0
SYMBOL oa_limit 288 144 R0
SYMATTR InstName A
SYMATTR SpiceLine gain=1e6
SYMATTR SpiceLine2 limit_p=5 limit_n=-5
SYMBOL res 448 432 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL cap 320 432 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 36 21 VTop 2
SYMATTR InstName C1
SYMATTR Value 159.19nF
SYMBOL cap 256 544 R180
WINDOW 0 24 56 Left 2
WINDOW 3 -39 -37 Left 2
SYMATTR InstName C2
SYMATTR Value 159.19nF
SYMBOL res 128 464 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL npn -416 256 R0
SYMATTR InstName Q1
SYMATTR Value qNPN
SYMBOL npn -144 256 M0
SYMATTR InstName Q2
SYMATTR Value qNPN
SYMBOL current -272 496 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 0.1mA
SYMBOL res -224 0 R0
SYMATTR InstName Rc2
SYMATTR Value 4k
SYMBOL res -368 0 R0
SYMATTR InstName Rc1
SYMATTR Value 4k
SYMBOL voltage -512 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vcc
SYMATTR Value 15V
SYMBOL voltage -512 240 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vee
SYMATTR Value -15V
SYMBOL res 48 240 R0
SYMATTR InstName Rf1
SYMATTR Value 2k
SYMBOL res 320 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rf2
SYMATTR Value 2k
TEXT 744 304 Left 2 !.tran 1u 20m 0 1u
TEXT 744 352 Left 2 !.lib oa_limit.sub
TEXT 752 392 Left 2 !.model qnpn npn