Quantity   Component name
1 × Teensy3.2 $19.80
1 × audio+SD adapter board for teensy $14.25
1 × ATMega328P for LEDs and IR input $2.50
1 × ATMega328P for remote keyboard $2.50
1 × HT82V739 audio power amp $0.40
1 × NJM2396F33 3.3V regulator $0.30
1 × TSOP38238 IR receiver $0.40
1 × small 8ohm speaker $1
1 × electret microphone $0.20
46 × blue and red smd LEDs $4
1 × 20kohm log potentiometer $1
3 × AA(#3) batteries + holder $1
17 × tact switches $1.70
1 × rocker switch for main power control $1
1 × 1000uF electrolytic capacitor $0
1 × 10uF electrolytic capacitor $0
2 × 1uF ceramic capacitor $0
1 × 72cm x 18cm plywood $1
1 × piece of protoboard $1
1 × several meters of wire taken from an ethernet cable $0