LM317T Voltage Regulator with Pass Transistor

this is a little electronics project i decided to build using simple compononets. it allows me to input any voltage from around 4v-30v and always have 3v out. components: 1kohm variable resistor 220ohm resistor 1watt lm317t regulator + heatsink 1uf capacitor and .1uf capacitor diagram: www.tapr.org



http://www.youtube.com/watch?v=-Q2JxJAYQH8&hl=en