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WOW ! Diy Digital Line Tester

 

INSTRUMENT

  1.  BC 547 (3ps)
  2.  Resistor 1k
  3. 9v Battery
  4.  Switch
  5. LED
  6. PCB
  7. Circuit

➡️ https://www.facebook.com/348831912355238/posts/522932191611875/

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