Version 4
SHEET 1 2964 800
WIRE 784 16 320 16
WIRE 1104 16 784 16
WIRE 1232 16 1104 16
WIRE 320 48 320 16
WIRE 320 128 224 128
WIRE 400 128 320 128
WIRE 224 176 224 128
WIRE 400 256 400 128
WIRE 784 256 784 16
WIRE 1104 272 1104 16
WIRE 224 304 224 256
WIRE 336 304 224 304
WIRE 1232 304 1232 16
WIRE 224 336 224 304
WIRE 784 384 784 336
WIRE 848 384 784 384
WIRE 1104 384 1104 352
WIRE 1104 384 1008 384
WIRE 784 416 784 384
WIRE 1104 416 1104 384
WIRE 224 464 224 416
WIRE 320 464 224 464
WIRE 400 464 400 352
WIRE 400 464 320 464
WIRE 720 464 400 464
WIRE 1232 464 1232 384
WIRE 1232 464 1168 464
WIRE 1232 528 1232 464
WIRE 320 544 320 464
WIRE 784 560 784 512
WIRE 944 560 784 560
WIRE 1104 560 1104 512
WIRE 1104 560 944 560
WIRE 944 592 944 560
WIRE 320 704 320 624
WIRE 944 704 944 672
WIRE 944 704 320 704
WIRE 1232 704 1232 608
WIRE 1232 704 944 704
FLAG -192 32 Vcc
FLAG -192 112 0
FLAG -48 48 0
FLAG -48 128 -Vcc
FLAG 848 384 vs1
FLAG 1008 384 vs2
FLAG 784 16 Vcc
FLAG 944 704 0
SYMBOL /res 208 160 R0
SYMATTR InstName RB1
SYMATTR Value 900k
SYMBOL /res 208 320 R0
SYMATTR InstName RB2
SYMATTR Value 60k
SYMBOL /npn 336 256 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL voltage -192 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL res 304 32 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL voltage -48 32 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL res 768 240 R0
SYMATTR InstName RC1
SYMATTR Value 2k
SYMBOL res 1088 256 R0
SYMATTR InstName RC2
SYMATTR Value 2k
SYMBOL res 928 576 R0
SYMATTR InstName RE
SYMATTR Value 400
SYMBOL npn 720 416 R0
SYMATTR InstName Q2
SYMBOL npn 1168 416 M0
SYMATTR InstName Q3
SYMBOL res 1216 512 R0
SYMATTR InstName R4
SYMATTR Value 17k
SYMBOL res 1216 288 R0
SYMATTR InstName R3
SYMATTR Value 80k
SYMBOL res 304 528 R0
SYMATTR InstName Rout
SYMATTR Value 25k
TEXT -232 344 Left 2 !.step temp -10 50 5
TEXT -232 728 Left 2 !.op