The module

3PCS 5V 700MA 3.5W AC-DC STEP DOWN ISOLATED SWITCHING POWER SUPPLY MODULE X 15

Driver module

ULN2003 4-PHASE 5-WIRE STEPPER MOTOR DRIVER MODULE BOARD XH-5P INTERFACE X 15

transformer

5A MONOPHASE ACTIVE OUTPUT AC CURRENT TRANSFORMER MODULE FOR ARDUINO X 15

Audio module

LM386 MODULE 20 TIMES GAIN AUDIO AMPLIFIER MODULE WITH ADJUSTABLE RESISTANCE X 15