Quantity   Component name
1 × nodemcu Wifi MCU - ESP12E variant
1 × Arduino uno used as ADC and DAC
1 × Car door lock actuator
1 × H-Bridge motor controller transistor driven
1 × Mic preamplifier Compatible with arduino based on LM358 opamp
1 × PAM8403 class D audio amplifier This 3W audio amplifier is awesome, any other small amp can be used
1 × 4 ohm 3W speaker
1 × 12v 2 amp power supply A descent power supply for audio application purpose with reduced hum and noise