cwiczenie22 (p-positive n-negative) 
.model bc107 npn BF=350
.model bc107a npn BF=350 VAF=200 IS=0.049f
.param opor 3.3k
Q1 c1 b1 e bc107
Q2 c2 0 e bc107
VZP p 0 15
VZN n 0 -15
V1 b1 0 ac 1 dc 1
Rc1 c1 p {opor}
Rc2 c2 p 3.3k
*Re e n 6.8k
i1 e n 2.1m
.op
.ac dec 100 1 10meg
.step lin param opor 5k 15k .1k
.dc lin v1 -100m 100m .1m
*.temp 27 90
.probe
.end