Version 4
SHEET 1 928 680
WIRE 64 -64 64 -96
WIRE 608 -48 608 -80
WIRE 608 48 608 16
WIRE 752 48 608 48
WIRE 64 64 64 16
WIRE 224 64 64 64
WIRE 272 64 224 64
WIRE 608 64 608 48
WIRE 752 80 752 48
WIRE 64 96 64 64
WIRE 224 112 224 64
WIRE 352 112 224 112
WIRE 480 112 432 112
WIRE 544 112 480 112
WIRE 608 176 608 160
WIRE 752 176 752 160
WIRE 752 176 608 176
WIRE 608 208 608 176
WIRE 64 256 64 176
FLAG 64 256 0
FLAG 272 64 out
FLAG -384 -192 12V
FLAG 64 -96 12V
FLAG -384 -112 0
FLAG 608 208 0
FLAG 608 -160 12V
FLAG 480 192 0
SYMBOL LED 592 -48 R0
SYMATTR InstName D1
SYMATTR Value NSPW500BS
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage -384 -208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 736 64 R0
SYMATTR InstName R1
SYMATTR Value 47k
SYMBOL res 48 -80 R0
SYMATTR InstName R4
SYMATTR Value {R_sw}
SYMBOL res 592 -176 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 48 80 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL npn 544 64 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL res 448 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 100k
SYMBOL res 496 208 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R6
SYMATTR Value 100k
TEXT -322 -242 Left 2 !.op
TEXT 176 -200 Left 2 !.param R_sw=10Meg