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@@ -0,0 +1,56 @@
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+Version 4
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+SHEET 1 880 680
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+WIRE 96 -16 -160 -16
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+WIRE 304 -16 96 -16
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+WIRE 480 -16 304 -16
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+WIRE 96 16 96 -16
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+WIRE 304 16 304 -16
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+WIRE 480 16 480 -16
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+WIRE 96 128 96 96
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+WIRE -160 160 -160 -16
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+WIRE 304 192 304 96
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+WIRE 304 192 208 192
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+WIRE 480 192 480 96
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+WIRE 480 192 416 192
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+WIRE 96 240 96 192
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+WIRE 144 240 96 240
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+WIRE 304 240 304 192
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+WIRE 352 240 304 240
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+WIRE 224 288 208 288
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+WIRE 96 304 96 240
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+WIRE 224 304 224 288
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+WIRE 416 304 416 288
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+WIRE 96 400 96 384
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+FLAG -160 240 0
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+FLAG 96 400 0
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+FLAG 224 304 0
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+FLAG 416 304 0
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+SYMBOL zener 112 192 R180
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+WINDOW 0 24 64 Left 2
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+WINDOW 3 24 0 Left 2
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+SYMATTR InstName D1
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+SYMATTR Value BZX84B33VL
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+SYMBOL npn 144 192 R0
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+SYMATTR InstName Q1
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+SYMATTR Value 2N2222
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+SYMBOL npn 352 192 R0
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+SYMATTR InstName Q2
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+SYMATTR Value 2N2222
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+SYMBOL res 80 0 R0
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+SYMATTR InstName R1
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+SYMATTR Value 10k
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+SYMBOL res 80 288 R0
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+SYMATTR InstName R2
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+SYMATTR Value 10k
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+SYMBOL res 288 0 R0
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+SYMATTR InstName R3
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+SYMATTR Value 100k
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+SYMBOL res 464 0 R0
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+SYMATTR InstName R4
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+SYMATTR Value 100k
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+SYMBOL voltage -160 144 R0
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+WINDOW 123 0 0 Left 0
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+WINDOW 39 0 0 Left 0
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+SYMATTR InstName V1
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+SYMATTR Value PULSE(10 45 0 1 1)
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+TEXT -194 424 Left 2 !.tran 1
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kbere