MK139 circuit diagram

Hi there. I have just bought the MK139 clap switch kit to build with my son. It is his first electronic kit build and we would like to get hold of the wiring diagram for the actual circuit so we know how and why it works like it does. Is this available for us to download or purchase? Many thanks. Ian

Hereby a link to the diagram:

velleman.eu/images/tmp/MK139DIAGRAM.WMF

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This is great. Many thanks.