Version 4
SHEET 1 1472 680
WIRE -48 -64 -288 -64
WIRE 128 -64 -48 -64
WIRE 480 -64 128 -64
WIRE 656 -64 480 -64
WIRE 880 -64 656 -64
WIRE 1168 -64 880 -64
WIRE 480 -32 480 -64
WIRE 1168 -32 1168 -64
WIRE -48 48 -48 -64
WIRE 1168 64 1168 48
WIRE 1168 64 816 64
WIRE -288 80 -288 -64
WIRE 256 80 64 80
WIRE 304 80 256 80
WIRE 480 80 480 48
WIRE 480 80 384 80
WIRE 784 80 480 80
WIRE 1168 80 1168 64
WIRE 16 96 0 96
WIRE 256 96 256 80
WIRE 128 144 128 -64
WIRE 880 144 880 -64
WIRE 64 160 64 80
WIRE 96 160 64 160
WIRE 480 160 480 80
WIRE 656 160 656 -64
WIRE 816 160 816 64
WIRE 848 160 816 160
WIRE 256 176 256 160
WIRE 256 176 160 176
WIRE 304 176 256 176
WIRE 432 176 384 176
WIRE 1040 176 912 176
WIRE 16 192 16 96
WIRE 96 192 16 192
WIRE 784 192 784 80
WIRE 848 192 784 192
WIRE -288 224 -288 144
WIRE -48 224 -48 128
WIRE -48 224 -288 224
WIRE 1168 224 1168 176
WIRE 1168 224 1104 224
WIRE -288 272 -288 224
WIRE 1168 272 1168 224
WIRE 1200 272 1168 272
WIRE 480 288 480 256
WIRE 1168 288 1168 272
WIRE -288 400 -288 352
WIRE 128 400 128 208
WIRE 128 400 -288 400
WIRE 480 400 480 368
WIRE 480 400 128 400
WIRE 656 400 656 240
WIRE 656 400 480 400
WIRE 880 400 880 208
WIRE 1168 400 1168 368
WIRE 1168 400 880 400
WIRE 1168 432 1168 400
WIRE 480 448 480 400
FLAG 480 448 0
FLAG 1168 432 0
FLAG 1200 272 Mess
IOPIN 1200 272 Out
SYMBOL res 464 -48 R0
SYMATTR InstName R1
SYMATTR Value 27
SYMBOL res 288 160 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 29 60 VTop 2
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL voltage 656 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V1
SYMATTR Value 26
SYMBOL res 464 272 R0
SYMATTR InstName RL
SYMATTR Value 100
SYMBOL References\\LT1634-2.5 -288 112 R0
SYMATTR InstName U2
SYMBOL potentiometer -64 32 R0
WINDOW 3 -112 -129 Left 2
SYMATTR Value Rtot=5K wiper={w}
SYMATTR InstName U4
SYMBOL res -304 256 R0
SYMATTR InstName R2
SYMATTR Value 22k
SYMBOL res 288 64 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 29 60 VTop 2
SYMATTR InstName R5
SYMATTR Value 2200
SYMBOL cap 240 96 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL Opamps\\LT1366 128 112 R0
SYMATTR InstName U1
SYMBOL pmos 432 256 M180
SYMATTR InstName M1
SYMATTR Value IRF9640
SYMBOL res 1152 -48 R0
SYMATTR InstName R4
SYMATTR Value 2k
SYMBOL res 1152 272 R0
SYMATTR InstName RL1
SYMATTR Value 2k
SYMBOL Opamps\\LT1366 880 112 R0
SYMATTR InstName U3
SYMBOL pnp 1104 176 M180
WINDOW 0 46 36 Left 2
WINDOW 3 46 59 Left 2
SYMATTR InstName Q1
SYMBOL pnp 1040 224 M180
WINDOW 0 51 25 Left 2
WINDOW 3 49 47 Left 2
SYMATTR InstName Q2
TEXT -304 464 Left 2 !.op
TEXT -304 496 Left 2 !.step param w 0 1 0.1
TEXT -304 552 Left 2 !.lib potentiometer.sub
TEXT 0 496 Left 2 !.options gminsteps=0 srcsteps=0
TEXT 408 296 Left 2 ;Last
TEXT 1216 136 Left 2 ;BC516\nDarington Trans.
TEXT 0 528 Left 2 !.options cshunt=1e-16 ptrantau=10n
RECTANGLE Normal 576 384 384 272 2
RECTANGLE Normal 1200 240 1040 80 2