- Can only detect if there is a sound, which reach the threshold setup by the adjustable resistor, can’t detect the size or frequency of the sound.
- Based on the microphone and LM358 IC
- Working voltage: DC 4-6V
- Signal indicator LED
- Digital signal output
- Output right signal as Low TTL (LED On)
- Could be used for a sound control light, light alarm, light control and light detection