Introduction:

This Audio level indicator DIY KIT need the audio output to be connected to the two pins of J1 in the circuit. The audio output that supported are from speaker or earphone. The louder audio, the higher the signal strength. This DIY KIT will light up LED to indicates the current level of signal of audio that it received. The higher signal means more LED will be light up and the lower signal mean less LED will be light up.

Components List:

R1, R5 & R8=1kΩ,

R2=100 Ω,

R3=10kΩ,

R4=50kΩ Variable Resistor,

R6=560Ω, R7=10Ω,

R9=20kΩ,

C1 & C2=104 Ceramic Capacitor,

U1=IC LM3915,

D9 & D10= Red LED,

D1-D8=Yellow LED,

J2=XH2.54-2P Connector,

J1 & J3=Male Header 2 Pin,

IC Socket 18 Pin & PCB Board.

STS-105B Volume Amplification Microphone Module DIY Kit