Wednesday, 24 March 2010

Credit Card 'Scratcher'

Another cool device joins the mechanised throng, a homemade credit card 'scratcher' based upon an idea from Nicholas Collins' excellent book Handmade Electronic Instruments. The credit card reader was bought cheaply through ebay and I added a pre-amp circuit using a CD4049 chip to up the volume a bit.

Sound samples to follow...

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