LM317T Voltage Regulator with Pass Transistor

This is a basic stamp controlled countdown timer. It uses: 1 Basic Stamp 2 2 seven-Segment displays (although there 4 shown) 2 seven-segment-display drivers 6 LED's 1 Buzzer 20 Resistors (14 for the 2 seven-segment displays and 6 for the LED's) 1 Push-button 1 Voltage regulator



http://www.youtube.com/watch?v=bC7aoeA6WVA&hl=en