10W Amplifier Using TDA 2003

I wanted to make an amplifier to my computer. Because it came with Small in build Speaker. that produce very small sound. So I built an amplifier to avoid that issue.

So in this instructable, I'll try to explain how to make an amplifier.

This is 10W mono Amplifier circuit with volume Controller. We will use TDA 2003 amplifier IC. This is one of Simplest circuit.

These are the parts that we need to build our circuit.

IC

• Audio Amplifier IC: TDA2003

Electrolytic Capacitor

• 4.7uF 25V - 1
• 470uF 25V - 1
• 1,000uF 25V - 2

Ceramic Capacitor

• 0.039uF 50V - 1
• 0.1uF 50V -2

Resistors(1/4w)

• 39 ohms -1
• 220 ohms -1
• 2.2 ohms -1
• 1 ohm -1
• SP1: 8 ohms Speaker -1

Additionally We need Audio jack, Soldering iron and other equipments that we use to build circuits.

Before we build the circuit. Lets get to know about this.

As I told before this is 10W mono Amplifier circuit. Amplifier IC is TDA2003 . This is one of Simplest circuit that we can build using TDA2003.

Features

• Very low number of external components
• Ease of assembly
• Cost and space savings
• Can use for a car or any other need
• Can be used to cascade audio speakers

TDA2003 Amplifier IC

TDA2003 is a general-purpose 10W amplifier IC that can be used in stereo or mono audio design circuits.  The amplifier can output up to 3.5A current to drive speakers and can also handle high current up to 5A for shorter duration without any damage. It can also handle short circuits in both AC and DC rail without killing itself. It has an operating voltage of 18V but can handle high voltage up to 28V. This makes it robust to be used in automotive audio designs.

The IC can be also operated from 12V and It is bread board friendly.

Not like many amplifier ICs this IC has only 5 pins. Its very easy to work with this.

Images and pin connections of the IC are given up.

You can read more about TDA2003 from the Data Sheet.

I got Circuit Diagram from the Data Sheet of Amplifier IC and did some changes to that. If you want to change the circuit keep remember the audio quality and gain depend on the components value.

Build the circuit on a bread board first, If you want or you can start build it on a Vero board or dot board.

If you want to make it on PCB. You can make your own PCB or use this one. Note It's better to use a PCB for assembling because it's accurate when you use PCB.

• PCB file
• First solder small items and then go to bigger ones in order.

Use terminal blocks or something to give power and to connect speakers.

Note that Its Essential to add cooing system to IC because IC heat up very quickly. You can use heat sink or cooling fan or Both.

It is very similar to the diagram in the TDA2003 datasheet. You can change values of the components if you want. but I recommend refer the data sheets first.

Check the Images. You will be able to understand why we should use each components and what they do.

C8 and C7 are for supplying high currents during peak passages. Tt also reduces the power supply ripples.

C4 and R3 are to Upper frequency cutoff.

R4, R5 is to Setting the Gain.

C5, R6 control the Frequency stability

C6 is coupling the Output.

R7 is to control the Volume.

I'll put datasheets, resistor color code, ceramic capacitors code and other things that you might be help.

(These images from the internet)

Finally,

Thank you and hope this was helpful.