Thursday, April 3, 2014

10W Mono Amplifier With TDA 2030

Welcome back everyone, this will be a short post about a 10W amplifier using a very popular IC called the TDA2030. This IC is available in Pentawatt package and it is readily available. So first start with its advantages.

Advantages :

1. Very few external component needed.
2. Circuit diagram is fairly simple and straightforward.
3. Pentawatt package makes it easy to design on a PCB.
4. This IC has short circuit protection.
5. It also has thermal shut down option.
6. Very low total harmonic and crossover distortion.
7. Very cheap IC.
8. It does not require regulated power supply.

Let's look at the circuit diagram and a typical power supply circuit.




Actual TDA 2030 IC is shown in the Image above. As stated above it is an IC of Pentawatt packaging, pin count starts from the left.

Pin 1 is the non inverting input, so it will be used for audio signal input, a 100Kohm variable resistor can be used as volume controller.

Pin 2 is a the inverting input, a feedback is given here.

Pin 3 and Pin 5 are used for powering up the IC, they are negative and positive voltage input respectively. 

Pin 4 is the output pin. 4/8 ohm speaker can be used with this circuit. 4ohm speaker will result in higher output but also higher total harmonic distortion. So, we will use 8ohm speaker here.

I haven't drawn any filtering capacitor as they are drawn with the power supply circuit. 

To download the TDA 2030 datasheet click here.


WARNING :

1. This IC will get pretty hot during operation, so a good heat-sink is a must.

2. Pin 3, which is the negative voltage input pin is connected to the Tab, do not connect the tab to the ground via heat-sink or anything.

Now the power supply



As mentioned above, TDA 2030 does not require a regulated power supply which saves us a lot of hassle. A simple Center Taped transformer TR is used, it is a 15V-0V-15V Transformer. 

A bridge rectifier is then used. Don't use 1N400X series diodes, use 1N5408 or anything similar.

Don't use very large electrolytic capacitors. 2200uF is enough. All four of these capacitors are used for filtering. 

The power supply line contains different noises of different frequencies and their harmonics that might come through the rectification, the 0.1uF capacitors are used for suppressing those noises. Use Mica or Ceramic type capacitors here.

Good luck and Happy experimenting!


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