A warm-up instrument to start the month, and preparation for my
upcoming fun with coils workshop. I assembled a simple magnetic field
amplifier kit and used it to listen to the motor of a wind-up
flashlight.
![](http://farm5.static.flickr.com/4002/4323579831_777e474421.jpg)
upcoming fun with coils workshop. I assembled a simple magnetic field
amplifier kit and used it to listen to the motor of a wind-up
flashlight.
![](http://farm5.static.flickr.com/4002/4323579831_777e474421.jpg)