Version 4 SHEET 1 1224 824 WIRE 432 32 432 0 WIRE 32 96 32 64 WIRE 176 96 176 64 WIRE -192 144 -192 80 WIRE 432 144 432 112 WIRE 432 160 432 144 WIRE 176 208 176 176 WIRE 368 208 176 208 WIRE 176 224 176 208 WIRE -192 272 -192 224 WIRE -192 272 -256 272 WIRE 32 272 32 176 WIRE 112 272 32 272 WIRE 432 272 432 256 WIRE -256 288 -256 272 WIRE 432 288 432 272 WIRE -192 320 -192 272 WIRE 176 336 176 320 WIRE 32 352 32 272 WIRE 176 352 176 336 WIRE 432 416 432 368 WIRE -192 464 -192 400 WIRE 32 480 32 432 WIRE 176 480 176 432 FLAG 432 0 VCC FLAG 432 416 VEE FLAG -256 288 0 FLAG -192 80 VCC FLAG -192 464 VEE FLAG 432 272 C2 FLAG 432 144 E2 FLAG 176 64 VCC FLAG 176 480 VEE FLAG 176 208 C1 FLAG 176 336 E1 FLAG 32 480 VEE FLAG 32 64 VCC FLAG 32 272 B1 SYMBOL voltage -192 128 R0 SYMATTR InstName Vps1 SYMATTR Value 15V SYMBOL res 416 16 R0 SYMATTR InstName RE2 SYMATTR Value 2k SYMBOL res 416 272 R0 SYMATTR InstName RC2 SYMATTR Value 2.7k SYMBOL voltage -192 304 R0 SYMATTR InstName Vps2 SYMATTR Value 0V SYMBOL pnp 368 256 M180 SYMATTR InstName Q2 SYMATTR Value pnp_ideal_transistor SYMBOL res 160 80 R0 SYMATTR InstName RC1 SYMATTR Value 5k SYMBOL npn 112 224 R0 SYMATTR InstName Q1 SYMATTR Value npn_ideal_transistor SYMBOL res 160 336 R0 SYMATTR InstName RE1 SYMATTR Value 3k SYMBOL res 16 80 R0 SYMATTR InstName RB1 SYMATTR Value 100k SYMBOL res 16 336 R0 SYMATTR InstName RB2 SYMATTR Value 50k TEXT 104 640 Left 2 !.OP TEXT -136 576 Left 2 !.model npn_ideal_transistor npn (Is=1.8104e-15 Bf=100 Vaf=100V)\n.model pnp_ideal_transistor pnp (Is=1.8104e-15 Bf=100 Vaf=100V)