I thought this DIY Oscilloscope was worth sharing, it is in no way a professional oscilloscope but it's certainly is good enough to display wave forms.
I think it's neat for the price $23 (£15).
Note: There is two versions of this board, the earlier version had noise issues but the following link is the new version
http://www.banggood.com/DSO138-DIY-Digi ... 84002.html
A video of the board which shows the DIY Osc working, the guy in the video had issue with his original TFT so he got a replacement,
the video also shows the noise issue (this is the old version board).
DSO138 DIY Digital Oscilloscope Kit SMD Soldered 13803K Vers
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DSO138 DIY Digital Oscilloscope Kit SMD Soldered 13803K Vers
If you don't know what Voltage your country is using, you shouldn't be doing electronics 

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Re: DSO138 DIY Digital Oscilloscope Kit SMD Soldered 13803K
That is a very good price which I guess is one of the great things about having electronics as a hobby - it doesn't cost much!
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