Version 4
SHEET 1 2580 776
WIRE 0 -464 -64 -464
WIRE 112 -464 0 -464
WIRE 240 -464 112 -464
WIRE 320 -464 240 -464
WIRE 576 -464 416 -464
WIRE 704 -464 576 -464
WIRE 800 -464 704 -464
WIRE 1088 -464 800 -464
WIRE 1216 -464 1088 -464
WIRE 1312 -464 1216 -464
WIRE 240 -448 240 -464
WIRE 1216 -448 1216 -464
WIRE 800 -432 800 -464
WIRE 112 -384 112 -464
WIRE 0 -368 0 -464
WIRE 240 -368 240 -384
WIRE 704 -368 704 -464
WIRE 1216 -368 1216 -384
WIRE 704 -272 704 -288
WIRE 800 -272 800 -368
WIRE 800 -272 704 -272
WIRE 704 -256 704 -272
WIRE -560 -240 -560 -272
WIRE -336 -240 -336 -272
WIRE 112 -240 112 -304
WIRE 0 -192 0 -304
WIRE 48 -192 0 -192
WIRE 704 -160 704 -176
WIRE -560 -144 -560 -160
WIRE -336 -144 -336 -160
WIRE 0 -144 0 -192
WIRE 240 -144 112 -144
WIRE 368 -144 368 -400
WIRE 368 -144 240 -144
WIRE 752 -80 656 -80
WIRE 800 -80 800 -272
WIRE 800 -80 752 -80
WIRE 816 -80 800 -80
WIRE 576 -64 576 -464
WIRE 752 -64 752 -80
WIRE 816 -64 816 -80
WIRE 656 -48 656 -80
WIRE 656 -48 608 -48
WIRE 0 -32 0 -64
WIRE 240 -32 240 -144
WIRE 272 -32 240 -32
WIRE 368 -32 336 -32
WIRE 384 -32 368 -32
WIRE 544 -32 464 -32
WIRE 1088 -32 1088 -464
WIRE 624 -16 608 -16
WIRE 656 -16 624 -16
WIRE 656 16 656 -16
WIRE 752 16 752 0
WIRE 752 16 656 16
WIRE 816 16 816 0
WIRE 816 16 752 16
WIRE 576 32 576 0
WIRE 240 64 240 -32
WIRE 272 64 240 64
WIRE 368 64 368 -32
WIRE 368 64 336 64
WIRE 624 80 624 -16
WIRE 960 80 624 80
WIRE 1088 80 1088 48
WIRE 1088 80 1040 80
WIRE 1120 80 1088 80
WIRE 624 96 624 80
WIRE 624 176 624 160
FLAG -336 -144 0
FLAG -336 -272 in
FLAG 240 -368 0
FLAG 0 -32 0
FLAG -64 -464 in
FLAG 576 32 0
FLAG 624 176 0
FLAG 1216 -368 0
FLAG 1312 -464 out
FLAG 704 -160 0
FLAG 1088 80 zener
FLAG -560 -144 0
FLAG -560 -272 vref
FLAG 1120 80 vref
FLAG 800 -272 feedback
DATAFLAG 800 -304 ""
SYMBOL npn 320 -400 R270
WINDOW 0 15 99 VRight 2
WINDOW 3 -16 75 VRight 2
SYMATTR InstName Q1
SYMATTR Value Qd44h11
SYMBOL voltage -336 -256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 24
SYMBOL pnp 48 -144 M180
SYMATTR InstName Q2
SYMATTR Value BC556B
SYMBOL diode 832 -64 M0
WINDOW 0 -46 27 Left 2
WINDOW 3 47 99 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode 736 0 M180
WINDOW 0 -49 32 Left 2
WINDOW 3 62 -34 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL polcap 272 80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 120µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=2.5 Irms=3.72678 Rser=0.018 Lser=0 mfg="KEMET" pn="A700D127M2R5ATE018" type="Al electrolytic"
SYMBOL zener 336 -48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D3
SYMATTR Value KDZ6_8B
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 480 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL polcap 224 -448 R0
SYMATTR InstName C6
SYMATTR Value 120µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=2.5 Irms=3.72678 Rser=0.018 Lser=0 mfg="KEMET" pn="A700D127M2R5ATE018" type="Al electrolytic"
SYMBOL res 96 -400 R0
SYMATTR InstName R1
SYMATTR Value 249
SYMBOL res -16 -160 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL LED -16 -368 R0
WINDOW 3 -139 5 Left 2
SYMATTR Value LED_GREEN
SYMATTR InstName D5
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL polcap 608 96 R0
SYMATTR InstName C1
SYMATTR Value 120µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=2.5 Irms=3.72678 Rser=0.018 Lser=0 mfg="KEMET" pn="A700D127M2R5ATE018" type="Al electrolytic"
SYMBOL res 1056 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 499
SYMBOL res 1104 64 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R5
SYMATTR Value 4.99k
SYMBOL polcap 1200 -448 R0
SYMATTR InstName C3
SYMATTR Value 120µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=2.5 Irms=3.72678 Rser=0.018 Lser=0 mfg="KEMET" pn="A700D127M2R5ATE018" type="Al electrolytic"
SYMBOL polcap 784 -432 R0
SYMATTR InstName C4
SYMATTR Value 120µ
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=2.5 Irms=3.72678 Rser=0.018 Lser=0 mfg="KEMET" pn="A700D127M2R5ATE018" type="Al electrolytic"
SYMBOL res 688 -384 R0
SYMATTR InstName R6
SYMATTR Value 1200
SYMBOL res 688 -272 R0
SYMATTR InstName R7
SYMATTR Value 1000
SYMBOL OpAmps\\LT1225 576 -96 M0
SYMATTR InstName U1
SYMBOL voltage -560 -256 R0
SYMATTR InstName V2
SYMATTR Value 6.9
TEXT 272 424 Left 2 !.MODEL Qd44h11 npn\n+IS=6.99994e-12 BF=91.0001 NF=1.04634 VAF=40.7259\n+IKF=10 ISE=7e-11 NE=3 BR=1.97064\n+NR=1.50008 VAR=22.902 IKR=35.9467 ISC=4.75e-12\n+NC=3.59375 RB=4 IRB=0.1 RBM=0.1\n+RE=0.0001 RC=0.130733 XTB=0.337319 XTI=1.40625\n+EG=1.13125 CJE=1.03578e-09 VJE=0.651779 MJE=0.35303\n+TF=3.07008e-09 XTF=1.35721 VTF=0.995654 ITF=1\n+CJC=3.98764e-10 VJC=0.429208 MJC=0.35114 XCJC=0.803125\n+FC=0.533449 CJS=0 VJS=0.75 MJS=0.5\n+TR=4.30593e-07 PTF=0 KF=0 AF=1\n* Model generated on Mar  1, 2004\n* Model format: PSpice
TEXT -376 -16 Left 2 !.tran 0 2 0 0.1
TEXT 216 -664 Left 2 ;https://tangentsoft.net/elec/opamp-linreg.html  \nhttps://refsnregs.waltjung.org/  \nhttps://linearaudio.nl/superregs
TEXT 1048 440 Left 2 !.model  LED_GREEN D(Is=8.2e-25 N=1.46 Rs=5.1 Eg=2.23)
TEXT 1520 -240 Left 2 !.ic V(out)=0
TEXT 1520 -208 Left 2 !.ic V(in)=0
TEXT 1520 -176 Left 2 !.ic V(zener)=0
TEXT 1520 -152 Left 2 !.ic V(feedback)=0
