# Sound to Light Converter

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## Introduction: Sound to Light Converter

I Had to build this for my sister who has hearing problem which lets her know when someone's knocking at the door downstairs. This device is easy to build and can be used anywhere in the house. It lights up with the slightest noise made either from knocking door or talking. Let's you know when someone is at the door when u are upstairs in your bedroom and someone's knocking.

## Step 1: Components Needed

You just need few components, I've listed each clearly and added the pics of how it looks like incase you are a beginner.
1. 10K Resistor(1)
2. 100K resistor (3)
3. 330K resistor (1)
4. 47K Resistor (3)
5. 47 resistor (3)
6. 1.5M resistor (3)
7. 100nF capacitor (3)
8. 100uF capacitor(1)
9. BC547B transistor (3)
10. BC557 transistor (2)
11. 9V battery
12. LEDs
13. Microphone (M300)
14. RV1 (1) to adjust the sensitivity
15. Soldering iron(if u soldering it)
16. Battery holder

## Step 2: Getting Started

Above is the circuit diagram of the whole circuit

## Step 3: Getting On

You can either use a solderless breadboard to first check how it works or go straight to solder the component on a breadboard when you are sure u understand the circuit. I started on a solderless breadboard and decided to go straight to solder it on a breadboard. You can create your own breadboard in green. I'll make a video on how to do that in my next project

## Step 4: Soldering the Components

Follow the circuit diagram and arrange the components as it appears on the breadboard and solder it nicely bit by bit

## Step 5: Finalising

After all components are done on the breadboard, get something to hold the battery in place, it could be a plastic battery holder or anything you thing is able to firmly hold it in place.

## Recommendations

• ### Large Motors Class

9,049 Enrolled

## 2 Discussions

A trimmer of value 220K means we can vary the resistance from 0 to 220K, hence any potentiometer within same range will work. If u take the trimmer out, that means u won't be able to vary the sensitivity of the circuit. But it should work without it. Give it a trial and observe how sensitive it is to sound. Let me know how u get along and I will gladly help. Cheers!