555 Astable Oscillator breakout board "555-o-tron"

February 24th 2016

A 555 astable oscillator breakout board. The 555 on this small breakout board is configured as an "astable oscillator". Once it's turned on it outputs a steady stream of pulses.
Experiment with various capactitor and resistor combinations. Available with straight or right-angled headers for direct connection to breadboards.
The 555 timer will output a steady stream of pulses whose frequency and duty cycle are determined only by the values of the capacitor, C, and resistors R1 and R2. Resistors can either be the normal fixed value type, variable resistors (trimmers or potentiometers), temperature sensors or light-sensitive devices (LDRs). The frequency of the pulsing will change as the variable resistor(s) value changes.
See the documentation below for more information on the simple formulae needed to calculate pulse frequency.
The 555 timer, in astable and monostable mode, appears in edexcel's GCSE D&T Electronic Products (2EP01) and AQA's GCSE Electronics (443) and A-level Electronics (2430) courses.
The 4017 also appears in AQA's GCSE Electronics (443) course.
Usage Suggestions
Ideal for prototyping and testing a range of 555 timer projects. Use it as a learning tool, a cheap signal generator, LED flasher, sound maker and much more.
Download the latest build instructions/documentation here (PDF).


  • Useful prototyping and testing breakout board
  • 555 timer IC
  • Slots directly in to any 2.54mm/0.1" breadboard

Kit Contents

  • High quality printed circuit board (PCB)
  • 1x 555 timer IC (datasheet)
  • 1x 8 pin DIL socket for the 555 IC
  • 1x 0.1uf capacitor
  • 6 pin female header (for capacitor C, and resistors R1 and R2
  • 4 pin male header (for connecting to a breadboard or female header)




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