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Overheating Coils with Audio Signal

Electrical - A/C & D/C - DoItYourself.com Community Forums - www.doityourself.com
Hello Forum,

I'm not sure this post belongs here but I'm looking for help anywhere I can.

I'm working on a project that requires controling the frequency and amplitude of multiple string vibrators and the easiest way for me to do this is using audio signals controlled with a MAX/MSP patch.

I bought this device Vibrator - WA-9857 : PASCO, it consists of a copper coil, a rare earth magnet and an aluminium reed, I already made my home imitation (foto). Since this device is made to work with a 5V AC power adapter at 60hz I have the following problem:

- If I use an amplified audio signal the coil overheats.

- If I use a sine wave generator I'm unable to control the signal's frequency and amplitude from my computer, not to mention that I would need multiple generators to control each vibrator.

I've also got Wave Driver - WA-9854 : PASCO, which is basically a loudspeaker with no cone and a reed to insert the string. This one does not overheat but it sounds loud and my project requires no sound or a soft sound. This would be my best solution but I need a way to get rid of the sound.

I am a musician and really don't know much about electricity or amplification, I would love to hire someone to help me build a device that meets my requirements or I wonder if any of you has any ideas or advice for me.

Thank you very much in advance


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