TDA2003 is a robust automotive grade audio amplifier IC. It supports up to 28 volts of operating voltage and can withstand input voltage fluctuation of 40 volts. A TDA2003 amplifier circuit is very easy to make. It’s powerful enough to provide up to 10 watt RMS power easily.
TDA2003 is manufactured by many different companies but they’re almost same internally.
You may find TDA2003A, which is the improved version, manufactured by STMicroelectronics.
TDA2003 amplifier circuit diagram
There are several audio amplifier design based on TDA2003, you can modify your design a little.
The circuit below is my favourite.
These parts are not absolute, you can easily replace a component with it’s suitable substitute.
I’m using the 100nF polyester film capacitor to minimise the electrolytic capacitor’s ESR.
You may want to use an effective volume and and bass-treble control circuit before the audio input.
Let’s have a look at the part list, though I’ve mentioned value of each component in the circuit diagram before.
- TDA2003 audio amplifier IC x1
- 1000uF, 25V capacitor x1
- 200uF, 25V capacitor x1
- 10uF, 10V capacitor x1
- 100nF polyester film capacitor x1
- 2.2Ohm resistor x1
- 220Ohm resistor x1
- Strip board/Vero board x1
These components are just for making the tda2003 amplifier circuit board. You’re going to need a power supply, connecting wires and other tools too.
Constructing the amplifier board
Making the amplifier board is rather easy, as it needs fewer components. A piece of strip board is enough to make it sturdy.
A picture below, how I made one.
You’ve to make sure that the power input and audio output wires are thick enough to carry sufficient power.
Also don’t forget to mount the TDA2003 IC on a heatsink with a bit of thermal compound. Use the largest heatsink you can.
Power supply: You can use a power supply between 12 volts to 24 volts, capable of supplying up to 2 Ampere. This amplifier is somewhat immune to input power noise or ripple. But you should always use a power source with lowest possible ripple to maintain audio quality.
The TDA2003 datasheet mentions that it can normally dissipate 20 watts of power. The datasheet also mentions that it can run from a 24 volt power supply. It also can continuously supply 3.5 amps to the load.
So why not improve it to get 20 watts out of it ?
I think it’s just the matter of using a bigger capacitor at the audio output, a bigger heatsink and a suitable power supply.
TDA2003 is a single channel amplifier IC, I’m planning to build a stereo amplifier like 6283 amplifier circuit in future with two TDA2003 IC.
What are your thoughts ? Let me know through the comments.