What is an Audio Power Amplifier?
An audio power amplifier is an electronic amplifier that has the capability of boosting low power audio signals to a higher level of strength. It uses some kind of input audio transducers such as a mic or phone to receive the audio signal and amplifies it, so that it can be heard on a device such as a loudspeaker. Audio power amplifiers are generally used to enhance the signal strength & improve the bass response of any input audio signal. So, in today’s tutorial, we are going to go over a step by step procedure on how To Make An Audio Power Amplifier Using a TDA2003 Amplifier IC.
The heart of this circuit is a TDA2003 IC. TDA2003 is a general-purpose audio amplifier circuit IC for stereo or mono audio design circuits. This amplifier IC can output up to 3.5A current to drive speakers & can also handle high current up to 5A for the shorter duration without any damage. It can also handle short circuits in both AC & DC rails without damaging itself. It has an operating voltage of 18V but can handle high voltages up to 28V. This makes it robust to be used in automotive audio designs such as car stereos.
Hardware Component
You will need the following parts to build this project.
| S.No | Component | Value | Qty |
|---|---|---|---|
| 1) | Audio Amplifier IC | TDA2003 | 1 |
| 2) | Loudspeaker | 8 Ohms | 1 |
| 3) | Audio Jack | 3.5mm, Female/male | 1 |
| 4) | Capacitor | 1000uF, 330uF, 100uF, | 3 |
| 5) | Film Capacitor | 0.1uF m(104J) | 1 |
| 6) | Soldering Iron | 45W – 65W | 1 |
| 7) | Soldering Wire with Flux | – | 1 |
| 8) | Resistor | 2.2 Ohms, 1 Ohms, 220 Ohms | 3 |
| 9) | Veroboard | – | 1 |
| 10) | DC Battery | 12V | 1 |
| 11) | Battery Clip | – | 1 |
| 12) | Jumper Wires | – | As per need |
TDA2003 Pinout
Useful Steps
1) Solder the TDA2003 IC on the veroboard. After that, solder the +ve pin 12v DC power jack with pin 5 of the IC and -ve pin with pin 3 of the IC.
2) After that, solder the +ve pin of the 330uF capacitor with pin 2 of the IC and -ve pin with the 2.2 Ohm resistor.
3) After that, solder a 220 resistor between the -ve pin of the capacitor and pin 4 of the TDA2003 IC.
4) Solder the +ve terminal of the 1000uF capacitor with pin 4 of the IC and the -ve pin with 0.1uF capacitor.
5) Solder the -ve of 0.1uF (104J) capacitor with a 1000uF capacitor and +ve with 1 Ohm resistor.
6) After that, solder the 1 Ohm resistor between pin 3 of the IC and 0.1uF capacitor. Also, solder the 100uF capacitor +ve pin with pin 1 of the IC and -ve with the audio input jack.
7) Connect the audio input (L+R) between the -ve terminal of the 100uF capacitor and pin 3 of the IC.
8) After that, Connect the speaker +ve pin with 1000uF capacitor -ve terminal and the -ve pin of the speaker with pin 3 of the IC.
9) Power up and test the circuit using a 12V battery.
Circuit Diagram
Working Explanation
The working of this circuit is actually quite simple. Audio input is taken from a device such as a mic or a mobile phone. Here a 100uF coupling capacitor is used, this capacitor blocks the DC component of the input audio signal, allowing only AC to pass through.
The output from the coupling capacitor then goes to the inverting input pin (2) of the TDA2003 audio amplifier. The amplified output from the IC then goes through a series of filtering capacitors to remove any residual noise from the signal. Here the 104J film capacitor and the 1 Ohm resistor set the bandwidth for the amplifier. The output audio signal can be taken on any loudspeaker of appropriate resistance.
Applications
- Commonly used in devices such as radio amplifiers & Speech amplifiers.
- An integral part of entertainment systems such as home theatre setups.
- It can be used to cascade audio speakers.
See Also: Bike Turning Signal Circuit | LC Meter Circuit using 555 Timer | How to Create 12v Power Bank
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