Description 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 Documentation: See the schematic and instruction on the attachment or this page.
