LM317T Voltage Regulator with Pass Transistor

Using a high power laser with a voltage regulator to performance a long range audio signal transfer. In the test, due to the limitation of my room, it is actually a short range. This is the first test for the circuit. I will make some adjustments on the circuit design and perform a long range test later. Enjoy. (?) ***** Notice, you may need to increase your headphone or speaker volume to hear the result. *****



http://www.youtube.com/watch?v=Y9Zez7Ypt8E&hl=en