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• #37C3 - Congress

  davedarko • 12/25/2023 at 23:00 • 0 comments

  First off all, I am very sorry for giving you a bag with freely flying resistors in it and that you have to read the value in the darkness of Congress! In parts this is @Alex 's fault, he once gave me bags of 0805 resistors and I recycled them in this projects, as I only want to use 0603 parts most of the time.

  Anywho, there might be a 330k resistor in there instead of a 390k resistor, so according to this fine website, it should blink 3 times per second, instead of 2 times.

  https://www.digikey.de/en/resources/conversion-calculators/conversion-calculator-555-timer

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  Here's the parts list:

  • R1, R4 100 Ohm
  • R3 150 Ohm
  • R2 390k Ohm
  • C1 1uF
  • D1, D2 RED LED (solder upside down)
  • U1 LMC555 timer 3V [Datasheet]

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  The 555 timer has a chamfer to indicate the side of the first pin.

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  Btw checkout Berlin's very fine sewage report:

  https://data.lageso.de/lageso/corona/corona.html#abwasser

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