[Help-gnucap] Oscillator

[xHeCS]

Is it possible to simulate a multivibrator using gnucap. It requires IC to 
be set so as to initialize oscilation.

Here is an example that use with spice-opus

*** Circuit Start ***********************************************************

Simulation-1. Blocking Oscillator

* Objective - 1. To Study Basic Operation of Self-Oscillating SMPS
*             2. Practice run for further investigation of 
Self-Oscillating SMPS

.control


tran 1uS 9000uS 8000uS uic
plot v(1,8) title Primary_Volatage
plot v(2) title Secondary_Voltage
plot i(v1) title Primary_Current
echo Simulation complete

.endc


* Power Source
v3  1 0 20V

* Resistors

r1 4 5 33
rl 10 0 10000Meg

* Transformer
* Using Coupled Inductor
l1 1 8 10mH
l2 0 2 47uH
l3 4 0 44uH
k1 l1 l2 0.995
k2 l1 l3 0.995
k3 l2 l3 0.995

* Semiconductors

q1 8 6 7 Qstk13003
d1 2 3 Dps201r

* Current measurement for dummies

v2 5 6 0
v1 7 0 0
v4 3 9 0
v5 9 10 0

* Capacitors

*c1 9 0 220uF ic=1V

.model Dps201r d   (is=2u rs=.03 n=1 tt=100p cjo=250p vj=.2 m=.18)

.model Qstk13003 npn  (is=15n bf=30 nf=1.67 vaf=700 ikf=2.0 br=4
+                  rc=.2 cje=500p tf=1.8n cjc=70p tr=25n)
~

*** Circuit Ends *******************************************************


,Fernan

--