CONTROLLED HALF WAVE RECTIFIER -- EXAMPLE 3-10 (contscr.cir)
.PARAM VM={120*SQRT(2)}
.PARAM ALPHA=45               ;delay angle in degrees
.PARAM DLAY={ALPHA/360/60}    ;delay in seconds
.PARAM PW={1MS}               ;gate pulse width
VS 1 0 SIN(0 {VM} 60)
R 1 2 2
XSCR 2 3 0 SCR                ;library SCR
RGATE 3 4 500                 ;resistor in gate circuit
VPULSE 4 0 PULSE(-1V 10V {DLAY} 1NS 1NS {PW} {1/60})   
                              ;voltage source in gate circuit
.LIB EVAL.LIB  ;include evaluation version library of devices
.TRAN .1MS 50MS UIC
.PROBE
.END