To construct the instrument we made use of a 555 timer and an op-amp based synthesizer. It creates varying sound frequencies based on the resistance between its two probes. By exploiting the resistive properties of graphite in combination with conductive paint, we were able to place distinct points of electrical resistance around the disk.
A conceptual midi controller that simulates the haptics of scratching a record on a vinyl turntable
When you place your hand on a spinning record and pull the record back you hear a scratch. Combine this with precisely timed quick cuts in sound output and you get what DJs call "scratching". Its the "wicky-wicky" sound that's synonymous with hip hop. While most of the DJing world has moved past vinyl to digital alternatives, scratch DJ specialists are still using turntables from the 1970s. The major reason for this is the haptic feedback these old models provide. The way the record pulls on and slides beneath your fingers actually helps the DJ to manipulate the music in a more precise way.