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Electronics Club

Flashing LED Project

LED stands for Light Emitting Diode

A kit for this project is available from RSH Electronics.

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This project is designed as an introduction to soldering, identifying common components, using the resistor colour code and placing components correctly on stripboard. The LED flashes at about 3Hz (3 flashes per second). This project uses a 555 astable circuit.


Parts Required


Instructions

  1. Solder the 8-pin chip holder in the correct place on the stripboard.
  2. Break the 4 tracks under the chip holder with a track cutter tool. You can allow extra holes if your piece of stripboard is large enough.

    Stripboard with chip holder


  3. Use the resistor colour code to identify the resistors which are marked with coloured bands to show their value.
  4. Insert and solder the resistors in the correct position, they can be put in either way round, but you must line them up correctly with the chip holder.
  5. Identify the other parts, then solder them in the correct position and the right way round. To help you identify the parts please see our page on soldering.

    Stripboard layout for flashing LED


  6. Solder the 2 wire links in place around the chip holder, it is easier to use plastic-coated single-core wire. (The flexibility of stranded wire is not needed for connections like this and the strands can be difficult to push through the small hole).
  7. Finally insert the 555 timer chip and connect a battery!
For a circuit diagram of the 555 astable circuit used in this project please see the Stripboard page.
Click here for RSH Electronics A kit for this project is available from RSH Electronics. If you are new to electronics buying a kit is a good way to be sure you have the correct parts for the project.

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© John Hewes 2007, The Electronics Club, www.kpsec.freeuk.com
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