Starlac Industries offers Demonstration Dynamo, EE - 679. Starlac Industries is an ISO 9001: 2000 certified manufacturer and exporter of scientific instruments. This Demonstration Dynamo is housed on a 230 x 90 mm approx. Base plate having a hand drive pulley 120mm diameter coupled to the smaller dynamo pulley. Its electrical output is through a pair of 4 mm sockets. This is also incorporated with a light emitting diode. This Demonstration Dynamo also acts as a motor on a 6-8V D.C. Supply.