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Open555

Ever wondered how a 555 timer IC worked? Here you have it! A 555 IC, made entirely with THT transistors.

Schematic

PCB

Features

  • Low power design! 3V operating voltage
  • On board square wave generator
  • Selectable features through solder bridges
  • A Schematic on the back side!
  • Super cute cats on the front side - Kudos to @acornitum

How to build

Just order the PCB & components, open up the KiCAD file and build it accordingly.

BOM

  • 1 Battery holder
  • 1 10uF Capacitor
  • 11 PNP Transistor
  • 11 NPN Transistor
  • 1 100k Resistor
  • 1 10k Resistor
  • 10 4.7k Resistor
  • 3 220 Resistor
  • 2 Potentiometer
  • 1 Push Button

Made by @Cyao on slack :D

Made as a part of http://solder.hackclub.com/!