Version 4 SHEET 1 1224 816 WIRE -96 96 -96 32 WIRE 432 160 432 80 WIRE 704 160 704 96 WIRE 256 208 160 208 WIRE 368 208 256 208 WIRE 848 208 768 208 WIRE 944 208 848 208 WIRE -96 224 -96 176 WIRE -96 224 -160 224 WIRE -160 240 -160 224 WIRE 160 240 160 208 WIRE -96 272 -96 224 WIRE 432 320 432 256 WIRE 560 320 432 320 WIRE 576 320 560 320 WIRE 704 320 704 256 WIRE 704 320 576 320 WIRE 160 336 160 320 WIRE 944 336 944 208 WIRE 944 336 160 336 WIRE 560 352 560 320 WIRE -96 416 -96 352 WIRE 560 464 560 432 FLAG 432 80 VCC FLAG 560 464 VEE FLAG -160 240 0 FLAG -96 32 VCC FLAG -96 416 VEE FLAG 576 320 E FLAG 704 96 VCC FLAG 256 208 IN+ FLAG 848 208 IN- SYMBOL voltage -96 80 R0 SYMATTR InstName Vps1 SYMATTR Value 15V SYMBOL npn 368 160 R0 WINDOW 3 78 100 Left 2 SYMATTR Value npn_transistor SYMATTR InstName Q1 SYMBOL voltage -96 256 R0 SYMATTR InstName Vps2 SYMATTR Value 15V SYMBOL npn 768 160 M0 WINDOW 3 91 -1 Left 2 SYMATTR Value npn_transistor SYMATTR InstName Q2 SYMBOL current 560 352 R0 SYMATTR InstName I1 SYMATTR Value 1mA SYMBOL voltage 160 224 R0 WINDOW 0 -55 14 Left 2 WINDOW 3 -53 96 Left 2 SYMATTR InstName Vd SYMATTR Value 0V TEXT 536 608 Left 2 !.OP TEXT 240 560 Left 2 !.model npn_transistor npn ( Is=14fA Bf=100 VAf=100V )