Version 4 SHEET 1 1524 1496 WIRE 112 -176 112 -256 WIRE 736 -112 736 -144 WIRE 112 0 112 -96 WIRE 528 0 368 0 WIRE 736 0 736 -32 WIRE 736 0 608 0 WIRE 848 0 736 0 WIRE 368 64 368 0 WIRE 736 160 736 0 WIRE 224 208 128 208 WIRE 368 208 368 144 WIRE 368 208 304 208 WIRE 432 208 368 208 WIRE 576 208 512 208 WIRE 672 208 576 208 WIRE 128 256 128 208 WIRE 576 256 576 208 WIRE 736 304 736 256 WIRE 128 384 128 336 WIRE 576 384 576 336 FLAG 112 0 0 FLAG 112 -256 VCC FLAG 736 -144 VCC FLAG 736 304 0 FLAG 576 384 0 FLAG 128 384 0 FLAG 848 0 SEN_OUT SYMBOL voltage 112 -192 R0 SYMATTR InstName Vps1 SYMATTR Value 12V SYMBOL res 720 -128 R0 SYMATTR InstName RC SYMATTR Value 4.7k SYMBOL npn 672 160 R0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL res 624 16 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName Rf SYMATTR Value 47k SYMBOL res 560 240 R0 SYMATTR InstName RS SYMATTR Value 10k SYMBOL current 128 336 R180 WINDOW 0 24 80 Left 2 WINDOW 3 24 0 Left 2 WINDOW 123 24 -22 Left 2 SYMATTR InstName Is SYMATTR Value 0 SYMATTR Value2 AC 1 0 SYMBOL voltage 368 160 R180 WINDOW 0 24 96 Left 2 WINDOW 3 24 16 Left 2 SYMATTR InstName V_Fdbk SYMATTR Value 0V SYMBOL voltage 416 208 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 -32 56 VBottom 2 SYMATTR InstName V_Err SYMATTR Value 0V SYMBOL voltage 208 208 R270 WINDOW 0 34 54 VTop 2 WINDOW 3 -32 56 VBottom 2 SYMATTR InstName V_s SYMATTR Value 0V TEXT 448 544 Left 2 ;.OP TEXT 376 448 Left 2 ;Spice Directive TEXT 32 56 Left 2 ;Power Supplies TEXT 320 496 Left 2 !.AC DEC 10 1Hz 1GHz