Create a schematic for Pulse width modulator. 

libSymbols:
- 4xxx:40106
- 4xxx:4013
- Comparator:LM339
- Device:C_Small
- Device:R
- power:+12V
- power:GND
schematicSymbols:
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    angle: 0
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      angle: 0
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    angle: 0
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      angle: 0
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      y: 38.1
      angle: 0
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      angle: 0
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    y: 73.025
    angle: 0
  properties:
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      y: 66.04
      angle: 0
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      y: 67.945
      angle: 0
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  entryName: LM339
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    angle: 0
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      angle: 0
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      angle: 0
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    angle: 0
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      angle: 0
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    angle: 0
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      angle: 0
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      angle: 0
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      angle: 0
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    angle: 0
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    angle: 0
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      angle: 0
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      angle: 0
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  entryName: R
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    angle: 0
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- libraryNickname: Device
  entryName: R
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    angle: 0
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    angle: 0
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    angle: 0
  properties:
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      angle: 0
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  entryName: +12V
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    angle: 0
  properties:
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      angle: 0
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    angle: 0
  properties:
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    angle: 0
  properties:
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  - key: Value
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      y: 145.415
      angle: 0
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  entryName: +12V
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    angle: 0
  properties:
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      angle: 0
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  entryName: R
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    angle: 0
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      angle: 0
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      angle: 0
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    angle: 0
  properties:
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    angle: 0
noConnects:
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    y: 111.76
    angle: null
busEntries: []
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globalLabels: []
sheetInstances: []
