DEMONSTRATION DYNAMO, SIMPLE (0378) Model mounted on a base, which also a hand-driven pulley coupled to the smaller d y n a m 0 pulley through an endless rubber belt to give a step-up ratio. Electrical output is via a pair of 4mm sockets and a light emitting diode is provided as simple output indicator. The model can also be used as a motor operating on a 6-8V DC supply Qty :