Quantity   Component name
1 × Old CD or DVD drive
1 × PIC16F887 Microprocessors, Microcontrollers
1 × 4MHz crystal
2 × 18pF Ceramic Capacitor
1 × 10K Resistor
1 × 27K Resistor
1 × 6.2K Resistor
2 × 1K Resistor
2 × 470R Resistor
2 × 330R Resistor
7 × 180R Resistor
1 × 4-digit 7-segment LED Commaon Anode 4-digit display
1 × LT1371 Switch-mode regulator IC
2 × ZTX749 PNP
2 × DMN3404L MOSFET
1 × LP2951 5V regulator
1 × 470uF/16V Low ESR Capacitor
1 × 100uF/16V Low ESR Capacitor
1 × 4.7nF Ceramic Capacitor
1 × 10uH Inductor 1A DC
1 × 1N5817 Schottky Diode
2 × 100nF Ceramic Capacitor
1 × Battery holder(s) for 4xAA
4 × AA Battery
3 × LED 2xRed 1xWhite