A simple laser communicator. How would you like to talk over a laser beam? In about 15 minutes you can set up your own laser communication system, using cheap laser pen pointers and a few parts from Radio Shack.
source scitoys.com
Published: 2008/11/23 Tags: simple circuit projects
Parallel Port DC Motor Speed Control with Turbo C
Turbo C Of dc motors speed control done in two ways first excitation current by modifying it happens for the moment does not concern us Another method applied voltage by changing the motor speed can change thus this method is the usage of applied voltage DC (Direct Current) chopper (Converter) circuit is replaced by.
Parallel Port DC Motor Speed Control