Friday, November 30, 2007
Thursday, November 29, 2007
Wednesday, November 28, 2007
Sunday, November 25, 2007
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.
The Vtech Talking Whiz Kid Plus is a fairly stable benders playground. there are more than a dozen bends that will yield similar results of the toy crashing and spewing out random bits and pieces of words. The tough part is finding bends that do not sound too much the same.
From the top of the piece, you can see I paid a paltry $1.99. The toggles trigger bends from left to right as follows: random spew A, rhythmic loop slow, rhythmic loop medium, rhythmic loop fast, "tremolo" warble slow, "tremolo" warble fast, sample freeze, random spew B.
From inside, you can see the cavernous amount of unused space where the main board resides. There is more than enough room for 20 or more toggle switches if one so dared.
To get to the main board you must detach the keyboard by either unscrewing the connection between to the main logic board and keyboard, or breaking off the excess plastic holding the keyboard in place (the three red dots in the lower area of the above photo).
Now for the bend points:
Random spew A: brown with white stripe to red with white stripe
Rhythmic loop slow: pink to light green with white stripe
Rhythmic loop medium: red to light green with white stripe
Rhythmic loop fast: green to light green with white stripe
"Tremolo" warble slow: pink to gray with black stripe
"Tremolo" warble fast: yellow to red
Sample freeze: yellow to pink with black sripe
Random spew B: blue with white stripe to red with white stripe
Friday, November 23, 2007
Wednesday, November 21, 2007
Tuesday, November 20, 2007
Monday, November 19, 2007
Saturday, November 17, 2007
Friday, November 16, 2007
Thursday, November 15, 2007
Wednesday, November 14, 2007
Monday, November 12, 2007
Saturday, November 10, 2007
I bought this the same day I grabbed the 99 cent geetar. This past Wednesday I finally bent it. I found pitch up and pitch down bend points as well as a jump that only works when the pitch up/down bends are active. The final result is a fairly simple noise making toy. For playability I added jumps to the pitch up/down bends to max them out instantly.
Inside you can see the signal flow of the bends. The pot I used has a built in switch which is handy. I placed the down bend pot and the body contacts next to each other because they work best together - the body contacts don't work as consistently with the pitch up bend. Placing the up bend toggle and photocell above the down bend makes it easy for me to remember what they do. The pushbuttons short the pitch bend signal path for instant max high/low. There is a 250k resistor on the signal from the speaker to the 1/4 out tip to tame the way too hot signal for use in a mixer/amp.