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LIVE DIY: Multi User Call Bell for 9 People


This unique but simple call bell can be used to call an office boy or help at home, from nine different places. Besides ringing, it shows the number of the caller’s room or place from where the call is being made.

Key Takeaways:

  • What is 7805 and how to use it
  • What is 74LS147 10-line to 4-line priority encoder
  • What is 74LS04 hex inverter
  • What is 74LS247 7-segment decoder driver
  • What is NE555 and how it works
  • What is the 7-segment display LTS-6960HR/LTS542 etc

Who would be benefited the most:

  • DIYer and Electronics Enthusiasts
  • Researchers and students working on the electronics projects
  • Students studying engineering /diploma
  • New small startup electronics hardware production industry





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