LM317T Voltage Regulator with Pass Transistor

This video continues from a previous video on setting up a simple battery power supply on a breadboard. This video uses a mains transformer 9V Power Supply Unit (PSU) that allows us to power circuits without the need of a battery. However, the supply is noisy and could lead to difficulties. A diode is added to protect the circuit from reverse connections. A switch is added to simplify usage. A PTC (Positive Temperature Coefficient) Transducer is added to protect the circuit from short connections and Capacitors are added to smooth the supply. We use the oscilloscope to examine the quality of the output supply.



http://www.youtube.com/watch?v=FVMrA8C-GM0&hl=en