Version 4
SHEET 1 1920 680
WIRE 560 -32 480 -32
WIRE 672 -32 624 -32
WIRE 416 32 336 32
WIRE 528 32 416 32
WIRE 560 32 528 32
WIRE 672 32 672 -32
WIRE 672 32 624 32
WIRE 720 32 672 32
WIRE 784 32 720 32
WIRE 912 32 784 32
WIRE 1104 32 912 32
WIRE 1504 32 1200 32
WIRE 1712 32 1504 32
WIRE 1760 32 1712 32
WIRE 912 64 912 32
WIRE 1504 80 1504 32
WIRE 336 96 336 32
WIRE 1712 96 1712 32
WIRE 784 112 784 32
WIRE 1152 160 1152 96
WIRE 1232 160 1152 160
WIRE 528 176 528 32
WIRE 560 176 528 176
WIRE 656 176 624 176
WIRE 1376 176 1312 176
WIRE 1504 176 1504 160
WIRE 1504 176 1376 176
WIRE 784 192 784 176
WIRE 912 192 912 144
WIRE 1040 192 912 192
WIRE 1136 192 1040 192
WIRE 1504 192 1504 176
WIRE 1712 192 1712 176
WIRE 336 240 336 176
WIRE 416 240 336 240
WIRE 480 240 480 -32
WIRE 480 240 416 240
WIRE 560 240 480 240
WIRE 656 240 656 176
WIRE 656 240 624 240
WIRE 1312 240 1312 176
WIRE 1312 240 1168 240
WIRE 912 256 912 192
WIRE 656 272 656 240
WIRE 1136 288 1136 192
WIRE 1168 288 1168 240
WIRE 1232 288 1232 160
WIRE 1152 384 1152 352
WIRE 1200 384 1152 384
WIRE 1232 384 1232 368
WIRE 1232 384 1200 384
WIRE 912 432 912 416
FLAG 784 192 0
FLAG 1712 192 0
FLAG 1760 32 out
IOPIN 1760 32 Out
FLAG 656 272 0
FLAG 416 32 ac1
FLAG 416 240 ac2
FLAG 720 32 vp
FLAG 912 432 0
FLAG 1504 272 0
FLAG 1200 384 voa
FLAG 1040 192 vz
FLAG 1376 176 vrf
SYMBOL voltage 336 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -58 183 VLeft 2
SYMATTR InstName Vac
SYMATTR Value SIN(0 {12*sqrt(2)} 50)
SYMBOL cap 768 112 R0
WINDOW 0 -34 6 Left 2
WINDOW 3 -80 55 Left 2
SYMATTR InstName Cf
SYMATTR Value 2000µF
SYMBOL diode 624 224 R90
WINDOW 0 70 48 VBottom 2
WINDOW 3 43 9 VTop 2
SYMATTR InstName D1
SYMATTR Value dd
SYMBOL diode 624 160 R90
WINDOW 0 0 43 VBottom 2
WINDOW 3 -29 5 VTop 2
SYMATTR InstName D2
SYMATTR Value dd
SYMBOL diode 560 48 R270
WINDOW 0 -30 20 VTop 2
WINDOW 3 -3 58 VBottom 2
SYMATTR InstName D3
SYMATTR Value dd
SYMBOL diode 560 -16 R270
WINDOW 0 -30 17 VTop 2
WINDOW 3 -1 60 VBottom 2
SYMATTR InstName D4
SYMATTR Value dd
SYMBOL res 928 160 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName Rz
SYMATTR Value 5k
SYMBOL voltage 912 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vz
SYMATTR Value 2.980
SYMBOL res 896 320 R0
SYMATTR InstName rdz
SYMATTR Value 10
SYMBOL npn 1104 96 R270
SYMATTR InstName Q1
SYMATTR Value qNPN
SYMBOL oa_limit 1216 320 R90
SYMATTR InstName U1
SYMATTR SpiceLine gain=1000
SYMATTR SpiceLine2 limit_p=12.5 limit_n=1
SYMBOL res 1488 64 R0
SYMATTR InstName Rf1
SYMATTR Value 6k
SYMBOL res 1488 176 R0
SYMATTR InstName Rf2
SYMATTR Value 3k
SYMBOL res 1696 80 R0
SYMATTR InstName Ro
SYMATTR Value 10
SYMBOL res 1216 272 R0
SYMATTR InstName Roa
SYMATTR Value 50
TEXT 344 472 Left 2 !.tran .2m 60m 0 .2m
TEXT 344 512 Left 2 !.model Zener_9V D rs=1 bv=8.4\n.model dd d is=1e-12\n.model qnpn npn bf=20\n.lib oa_limit.sub