Quantity   Component name
1 × center tapped transformer
1 × 10k resistior
1 × LED Fiber Optics / Emitters
1 × 10mA meter
1 × switch Development Kits, Boards and Systems / Development Kits and Boards
1 × variable resistor
1 × music i.c Electronic Components / Misc. Electronic Components
1 × 3volts supply