Quantity   Component name
1 × Raspberry Pi Model A or B
2 × USB soundcard cheap one from ebay
1 × Amplifier cheap one from ebay
1 × Speaker Broken, bad sound. Perfect for the RING
1 × i2c LCD driver
1 × Hitachi HD44780 LCD
1 × Green LED
1 × Yellow LED
1 × Red LED
1 × PCF8574 (i2c I/O expander) Microprocessors, Microcontrollers, DSPs / Microprocessors (MPUs)
1 × Female RJ45 panel connector
3 × Minijack plugs Mono
1 × Some cable
1 × Matrix keyboard 4x4