If you are looking for a power amplifier for listening in a small house. This may be a good choice for you. It is a TDA2030 transistor amplifier.
Why is good? Because of the higher power than a mini amplifier. With an output power of 20W at 8Ω or 30W at the 4Ω speaker. Even max to 40w with higher power supply.
In normally TDA2030 delivers the power of 15W max. But this circuit we use two transistors to increase more output power.
Although it is great. But do not worry. It still is easy to build, without any adjustment.
The working principle
As shown figure the circuit, you see three main components. They are like three soldiers, TDA2030 and two transistors (TIP41, TIP42 or 2SC1061,2SA761 or BD908, BD907). Their helping to increase the signal up there.
Others components are useful as well. However, I will explain them to you learn as follows.
Figure 1. TDA2030 transistor amplifier circuit 30 watts output
When we enter the power supply and sound signals into this circuit. The capacitor C1 will prevent DC voltage through input. So, the sound signals can get into the pin 1 of IC1 easily.
Also, this circuit uses a single power supply that has two terminals are positive and Ground(negative).
So, we need to connect two resistor R1, R2, and C2 to divide the voltage by half. And, the R3 matches the input IC1.
In the circuit, the gain of IC1 is set to 14. Because it is a non-inverting amplifier pattern there.
Transistors boost up IC amplifier
The output signal flows out of pin 4. But it still is low. We need helping of the transistors. Both transistor Q1(TIP41) and Q2(TIP42) increase more power up.
How do they work? Resistor-R6 passes the current to supply IC1 of the positive terminal. Also, Resistor R7 passes the current to IC1 of the negative terminal.
When the many currents flow through R6 and R7. Then, the voltage drop across them exceeds 0.6V. Which is bias voltage to Q1 and Q2. So, they help to pass more current from the supply to output.
After that, the higher output signal flows the loudspeaker through C8.
While this circuit can protect the loss of high frequency that output to the loudspeaker by R8 and C7.
Also, both diodes D1 and D2 are used to prevent the return voltage from the speaker not to interfere with the IC1, Q1, and Q2.
If none of these two diodes may damage the device, including money in your pocket separately.
And, both filter capacitor the C7 and C8 smooth the power again before it is provided to the circuit there.
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How to build and setting
The Familiar thing in building the project is to make PCB (printed circuit boards) as Figure 2.
And, buy electronic components from stores list below.
When you finish the PCB and list. Next, you solder them on PCB
as shown in Figure 3
Components layout of TDA2030 transistor amplifier project
I believe you know the process of creating a good project.
You should Solder the components onto PCB, the low end to high end will be a beautiful view.
Make sure the device is a correct terminal before soldering.
This project uses IC1, Q1 and Q2 should use the big size heat sink to install them with together as shown in figure 2.
R1,R2,R3: 56K, 0.25W Resistor
R4: 3.3K(3K3), 0.25W Resistor
R5: 30K, 0.25W Resistor
R6,R7: 1.5Ω, 0.5W Resistor
R8: 1Ω , 0.5W Resistor
C1,C3,C6,C7: 0.22uF(224) 63V, Polyester Capacitor
C2: 47μF 25V
C4: 10μF 25V
C5,C8: 2,200uF 50V
D1-D2: 1N4001 or 1N4002
Q1: PNP transistor 2SA671 or TIP42 or TIP32 or BD908
Q2: NPN Transistor 2SC1061 or TIP41 or TIP31 or BD907
Sheets of mica, Cooling pad (Heat sink)
How to use
First, need to use the DC power supply of 24V to 30V of 1A for MONO.
Then take the audio source as the tuner, cassette or a CD player to test it.
Finally, Connect a 20W 8Ω the loudspeakers to the output.
For those who want to listen in stereo, you need to build up to two circuits. And change the power supply of 2 A. It can be used.
If you want a good circuit you may use 24V 2A regulated power supply. It is great.
Now, it is time to listen to a crystal clear sound from your created yourself.
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