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555 Astable Projects

555 Astable Projects

RK Education
Manufacturer: RK Education

Full Technical Specification 

This project has been designed to introduce the important concept of astable timers and pulse-width modulation using the 555 timer astable circuit.

Comprehensive teacher notes are available here.

This circuit is very important as it features heavily in KS4 curriculums. It has been designed to have more than one possible outcome and therefore more than one application. It allows for good differentiation and includes a transistor drive circuit.

  • Frequency can be varied by the 2 variable resistors
  • Battery-powered
  • PCB has space for a transistor drive circuit to allow higher powered outputs to be added
  • Clear silkscreen text has been used to make construction simpler
  • Professional double-sided PCB pre-drilled with silkscreen and solder-resist
  • 3 versions available for maximum flexibility: see technical specification
  • Empty PCBs are available separately, order code 70-9036
  • Suitable for Key Stages 2, 3 & 4 (ages 11 to 16)

Project notes for this and other project kits are available for download at our Education Resources site.


Technical Specification
Parts and quantities per kit
Order codeDescriptionEconomyWith drive circuitDeluxe
08-0275100nF ceramic capacitor1
11-022010uF electrolytic capacitor111
18-0092Battery clip PP3111
21-04612–way 16A 5mm terminal block2
22-01198–pin DIL socket111
47-31421N4007 1A diode11
55-17905mm red LED111
55-17925mm green LED111
62-03140R resistor222
62-0359270R resistor222
62-03731K resistor11
67-04082K preset222
76-0302SPDT slide switch111
81-0122BFY51 NPN transistor11
82-0336NE555 timer111
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