The Wiggles toy accordion actually makes use of accordion-like movement to trigger sounds. Pulling and pushing the accordion in and out pulls a string that is attached to a sprocket that bumps against a switch as it winds and unwinds. So this ends up being a very hands intensive bend.
This side of the accordion houses the main board as well as the sprocket that triggers the accordion sounds. Modifications seen here are pitch bend body contacts and pitch bend photoresistor on momentary push toggles.
On this side you can see the photoresitors that are activated by the push toggles on the opposite side of the accordion as well as three toggles for max pitch up, max pitch down, and a distortion + pitch down bend.
Inside the photoresistor side.
Top side of the main board. The three bends on the photo resistor only work with resistance in the path to the common point. Hence the sloppy add-on resistor pictured above.
Yellow is the common point. Red circles are distortion, pitch up, and pitch down + random note toggle - there must be resistance of about 5k between these points and common for them to work. Blue are body contact pitch bend points.
Sunday, November 25, 2007