feJ
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I'm trying to figure out a simple way to have a motor, hooked up to a timer circuit, that will switch polarity at a set interval. In other words, after, say 3 minutes, the polarity going to the motor will switch, putting the motor in reverse, then after another three minutes switch back. I'm pretty much a novice, so any help with this would be great. It will be part of a sound sculpture for my masters thesis exhibition.
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I'm a grad student at Rutgers University, working on my Masters in Fine Arts thesis show, and would like to build a piece that is nearly fully developed, except for one key part. I'm building a sculpture that "plays" the paint-roller texture of a wall. A small plastic needle runs down the wall. Attached to this needle is a contact microphone that picks up the sound from the needle, kind of like a record player.
What I would like to do is have the signal from the needle modulate the volume of a sine tone (coming from a separate source). I would prefer a hardware solution (ie: circuits, effects pedals, etc.) rather than a software one. I know this could be acheived using MAX/MSP but I dont' really know the program and don't want to have a dedicated computer just for this project if I can avoid it.
The only other idea I had was some kind of modified envelope follower that took two inputs and modulated one based on the other. I'm totally stumped. Any suggestions?
Switching polarity of motor
in Electronic Projects Design/Ideas
Posted
Sorry to disappear, I thought the site would email me when replies were posted. Anyway, I don't have any experience programming. I'm getting my masters in fine art, so I know a lot about welding and oil paint and all that, but this is my first foray into electronics other than simple wiring.
After a lot of consideration I realized that it would be easiest to have the needle move in a full circle rather than up and down for the simple fact that there would be no direction change. I appreciate all the suggestions.
If you're interested, images of the piece should be up in about a month at my website: www.jeffreythompson.org