Skip to content


April 27, 2007



These are fun and easy to build.  The solar engine is made from two transistors and a threshold "switch" that allows the two capacitors to be charged by the solar cell.  When the voltage across the capacitors reaches the threshold of the switch, the energy stored in the capacitor is released moving the Roller as current flows to the motor.  This allows the vehicle to move in a wide range of light intensities.


Solar Roller and BEAM resources:

No comments yet

Leave a Reply

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: