* OSCILLATOR CLOSED-LOOP CIRCUIT *
Q1 3 2 1 Q2N3904
*
VCC 4 0 DC 5V
* Frequency Determining Components
LT 4 3 3U 
RP 4 3 10K 
CC 3 5 100NF
C2 5 6 200P
C1 6 0 1.0N
* Bias Components
RE 1 6 44
LRFC 6 7 100U
REE  7 0 270
R1 4 2 3.3K
R2 2 0 1.5K
CB 2 0 3.3N
*
RL 5 0 5.00K
*
ISTART 0 3 PULSE(0  1M 6N 6N 6N 30N 300M)
*          PULSE(I1 I2 TD TR TF PW PER) 
* Pulse switches between I1 and I2, TD=time delay, TR = rise time, 
* TF = fall time, PW = pulse width, PER = period
.MODEL Q2N3904 NPN
+ ISS  =  0.          XTF = 1.00000     NS   =   1.00000
+ CJS  =  0.          VJS = 0.50000     PTF  =   0.
+ MJS  =  0.          EG  = 1.10000     AF   =   1.00000
+ ITF  =  0.50000     VTF = 1.00000     BF   = 280.92203
+ BR   = 20.00000     IS  = 2.3673E-15  VAF  = 130.20848
+ VAR  = 11.074004    IKF = 0.23419     ISE  =  3.0707E-16
+ NE   =  1.19409     IKR = 7.80101     ISC  =  3.5223E-12
+ NC   =  1.33867     IRB = 1.8864E-04  NF   =  0.97302
+ NR   =  0.97623     RBM = 1.0000E-02  RB   = 69.94226
+ RC   =  3.0000E-02  RE  = 0.25690     MJE  =  0.36064
+ MJC  =  0.29228     VJE = 0.81795     VJC  =  0.45460
+ TF   =  5E-10       TR  = 6.2636E-09  CJE  =  6.7441E-12
+ CJC  =  3.4247E-12  FC  = 0.95000     XCJC =  0.95425
*
.TRAN 2N 10U 0 2N
* step final no-print ceiling (ceiling forces SPICE to use the 
* requested step size, otherwise it sometimes uses bigger steps.
.PROBE
.OP
*.PRINT TRAN V(5) V(3) V(2) V(1)
.OPTIONS NOMOD
.END