Prelab 3, Exercise 5: UA741 3V/7V Schmitt Trigger
*-------------------------------------------------------------------------
* EE122 Prelab 3
* Exercise 5: 741 3V/7V Schmitt Trigger
*-------------------------------------------------------------------------

.include 'UA741_model'

* You fill in the ??? parameters

* example UA741 usage -> X1 in+ in- cc+ cc- out  UA741
X1 V+ Vref cc+ cc- Out UA741
Vplus cc+ 0 12V
Vminus 0 cc- 12V
R1 In V+ ???
R2 Out V+ ???
R3 cc+ Vref ???
R4 Vref 0 ???
Vin1 In n1 sin(0 10 1k)
Vin2 n1 0 sin(0 3 10k)

*---------------------------
* Trip point markers: 3V, 7V
*---------------------------
VP7 Vseven 0 pwl(0ms,7V 2ms,7V)
Rseven Vseven 0 1k
VP3 Vthree 0 pwl(0ms,3V 2ms,3V)
Rthree Vthree 0 1k

*-------------------
* Transient Analysis
*-------------------
.tran 10us 2ms
.print tran v(Out)

*--------
* Options
*--------
.op
.option post

.end