Here is one of my designs that I based off of a magnetic pendulum toy. The toy consisted of a dangling string with a magnet on the end of it; then it hovered over magnets on a table that either repelled or attracted the string magnet; the stringed magnet then maneuvers around in crazy patterns due to the position of the table magnets.
There are 2 control voltage outputs for this device; one for the X axis, and one for the Y. They vary from 0 to 5 volts. These can be used to change any parameter in a synthesizer or effects system to make interesting sounds. For instance, the X axis could control the pitch of an oscillator, while the Y axis could control the volume. Another example could be the X axis controls a delay time, while the Y axis controls the feedback of the delay unit. A third example (and a little more abstract) is to have the X axis control the length of a sequence pattern, and the Y axis control the tempo of the sequence.
One interesting thing about using the magnetic table to control sound is that when the pendulum passes over a magnet with a pole that attracts the pendulum, it overshoots a bit, then swing back toward the magnet and overshoots again, continuing to oscillate in a damped, simple harmonic motion. If the magnet is stronger (you can use larger magnets or stack them to make them have a stronger attraction or repulsion), then this oscillation is faster.
One interesting thing about using the magnetic table to control sound is that when the pendulum passes over a magnet with a pole that attracts the pendulum, it overshoots a bit, then swing back toward the magnet and overshoots again, continuing to oscillate in a damped, simple harmonic motion. If the magnet is stronger (you can use larger magnets or stack them to make them have a stronger attraction or repulsion), then this oscillation is faster.
For my design, I mounted an upside-down potentiometer-joystick on an arm above a plate of steel, then machined a long, aluminum rod to replace the shaft that was inside the joystick. At the end of this rod, a cavity was made and a powerful magnet was epoxied into the cavity. This magnet can freely hover over the steel plate. If magnets are placed on the table / plate, then they can repel or attract the rod (and therefore move the joystick) based on their position and polarity. The potentiometers on this joystick are wired as voltage dividers/ attenuators for DC voltage. There is a 9-volt battery inside going to a linear 5-volt regulator, then to the divider. The knobs on the front of the box control offset and range for X and Y.
This looks very interesting - please make a video documentation of it in action!
ReplyDeleteamen!
ReplyDeleteSuper cool - love it!
ReplyDeleteThe toy consisted of a dangling string with a magnet on the end of it; then ... magnetsmotion.blogspot.com
ReplyDeleteJon can you please post the basic concept of electronics design used? Impressed as always.
ReplyDelete-Seth
Thanks For Sharing Such an informatove post, Good work and great Stuff. Access us to know more about Magnets.
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