Amplifier on TEA2025b chip

Now there is a huge variety of circuits of audio amplifiers on microcircuits, for any needs, for any supply voltages, with different output power. Microcircuit amplifiers are simple to create, do not need special tuning, unlike transistor, but they also have quite good characteristics. That is why microcircuit amplifiers are now used everywhere: in car stereos, in computer speakers, in TVs, in music centers. One of these chips is quite popular TEA2025b. It can be found in many computer speakers or portable portable acoustics. This chip provides a power output of 1-2 watts, consumes a small current and does not require a radiator, while its power is quite enough for the sound of a small room. The advantages of TEA2025b also include the fact that it contains two channels at once, i.e. for the construction of a stereo amplifier is enough just one chip.

Amplifier circuit

Amplifier on a TEA2025b chip
The circuit does not contain any expensive or scarce parts.Capacitors C3 and C4 in it are dividing, even though the amplifier is not Hi-Fi, it’s still advisable to take film ones. Their capacity, if desired, can be increased from 220 nF to 0.5 - 1 μF, the level of low frequencies will slightly rise. P1 / A and P1 / B on the circuit - a dual variable resistor (potentiometer), with its help the volume is adjusted. Its face value is not so critical, you can take in the range of 10-50 kΩ. The diode D1 serves to protect the circuit from polarity reversal, because in case of supplying voltage of the wrong polarity to the microcircuit, it will immediately burn out. A diode will prevent such accidents. All capacitors on the circuit must be taken at a voltage not less than the supply voltage of the amplifier. Speakers may have a resistance of 4 ohms or higher. It should be borne in mind that the lower the impedance of the speakers, the greater will be the power of the amplifier. The best option is 8 ohms. During operation, the chip may become slightly warm, this is normal, because its housing does not provide for the installation of a radiator. "Amplifier on the TEA2025b chip

Assembling the amplifier on the TEA2025b chip

Creating any electronic device begins with the manufacture of a printed circuit board, it can be done at home using the LUT method. Download the board: The file with a printed circuit board image is attached to the article; you do not need to mirror it before printing. The board is made on a piece of PCB with dimensions of 60x35 mm. The LUT method has been described on the Internet more than once, I will give only a few photos of the process of creating a printed circuit board.
Amplifier on TEA2025b chip
Amplifier on TEA2025b chip
Amplifier on TEA2025b chip
Amplifier on a TEA2025b chip
After the board is ready, you can solder the parts into it. It is advisable not to solder the power wires and the speaker outputs to the board, but connect them using terminals. For convenience, the signal wire is connected to the board using a jack 3.5 connector. The wire from the source of sound to the amplifier board must be screened, otherwise you can not avoid extraneous noise.
Amplifier on the TEA2025b chip
Amplifier on a TEA2025b chip A few words about power. The optimal supply voltage of this amplifier is 9 volts. It will work already from 3 volts, however, the output power will be much less.In rest mode, i.e. when no signal arrives at the input, the amplifier's consumption is approximately 40-50 mA at a voltage of 9 volts. When the signal is applied to the input, the consumption rises to a level of 150-200 mA. Before the first switching on, it is imperative to turn off the speakers, turn on the ammeter in the gap of the supply wire and measure the current consumed by the circuit. If it is much higher than 50 mA, and the microcircuit quickly heats up, then you need to look for an error in the installation. If the current consumption is zero, then the circuit does not work, you also need to look for an error and check the correctness of the power connection. If the first time you turn on without speakers, nothing exploded, and the current consumption is normal, then you can connect the speakers and give a signal to the input. The source of the signal for the amplifier can be a player, computer, phone, any device having a linear output. Thus, on the TEA2025b it is possible to build a non-complex, tuner-free amplifier. It consumes a small current, has a low heat dissipation, which means it is the place for portable audio systems or simple computer speakers, where no super-quality sound is required.Successful build!

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