SOUND METER KIT

This project kit uses a microphone to measure the sound level and then displays the amount of sound by lighting more LEDs the louder it is. There is an adjustment to set the sensitivity and the output is displayed on 10 LEDs.

The circuit uses an LM386 audio amplifier IC to amplify the signal from the microphone, then the LEDs are driven by an LM3914 dot / bar display driver.

Features:

• When built the kit measures sound and displays the level accross LED's.
• Sound sentivity is adjustable.

Contents:

• 1 x 10KΩ Resistor.
• 1 x 22KΩ Resistor.
• 1 x 10KΩ Pot.
• 2 x 5mm Red LED.
• 5 x 5mm Green LED.
• 3 x 5mm Yellow LED.
• 1 x 100nF Ceramic Disc Capacitor.
• 1 x 10nF Capacitor.
• 2 x 10uF Capacitor.
• 2 x 1uF Capacitor.
• 1 x 220uF Capacitor.
• 1 x PP3 Clip Lead.
• 1 x Microphone.
• 1 x LM386 Audio Amplifier IC.
• 1 x LM3914 Dot / Bar Display Driver.
• 1 x 18 Pin IC Holder.
• 1 x 8 Pin IC Holder.

Dimensions:

• PCB Length: 91mm.
• PCB Width: 46mm.

Requires:

• Soldering Iron.
• Solder.
• Wire Cutters.

Resources:

• Build Instructions.
• Teaching Resources.

Note:

• This kit requires soldering.