Friday, June 26, 2009

Digital Scratch Pad

"Digital Scratch Pad" was made using a 555 timer IC . The sound is controlled through a photo-cell which is sensitive to light. As you cover the photo-cell, the the sound gets deeper, and as the cell is exposed to more light, the pitch gets higher. Underneath the felt is a flex sensor. The more pressure you place on the felt, the more it distorts the sound. There is a 1/4 inch jack, so you can plug it into an external speaker to make it louder. I've used this plugged into a Marshall stack, and it sounds awesome. 


  1. I like the simplicity of your designs.

    I've seen and heard more complex versions of this but I like everyday hobbled look your work has:)

  2. Oh my God! Another cigar box! :-)

  3. Christopher this is the only one I made. If you really want it. Email me, we can figure something out!