TDA1521 power amplifier board – An affordable amplifier board with simpler peripherals than TDA2030. Do you want to find an affordable amplifier board with simpler peripherals than TDA2030? This amplifier can meet your needs. It uses the very classic amplifier IC: TDA1521, which only requires extremely simple peripherals to operate (the power supply part is more complex than the amplifier part (doge)). TDA1521, TDA1521A, TDA1521Q

Since it is a linear amplifier, the sound is more pleasant to listen to, with a maximum output power of 12W * 2 (Note 1), making it more suitable for lower power desktop speakers (to avoid pushing the speakers too hard). It comes with a cooling fan power supply circuit, which can be freely equipped with 7805, 7812, eliminating the hassle of finding an additional power supply for the cooling fan (Note 2). The fan power supply circuit has additional rectification filtering to reduce interference from the fan entering the amplification circuit. The amplification circuit is powered by GBJ2510 rectifier bridge, with lower internal resistance, 10.000uf large capacitor filtering, better transient response performance, and lower AC bottom noise (amazing circuit design (doge)).

By abandoning the preamp, the distortion caused by the preamp op-amp is reduced, and the signal passes directly through the amplifier after the volume potentiometer, providing a more transparent listening experience.

About IC TDA1251

The IC TDA1251 is a stereo audio amplifier chip that is commonly used in audio applications such as radios, televisions, and portable speakers. It is known for its high-quality sound output and efficiency in amplifying audio signals. The TDA1251 is a versatile chip that can be easily integrated into various audio systems due to its compact size and low power consumption. It features built-in protection circuits to prevent damage from short circuits and thermal overload, making it a reliable choice for audio amplification. Overall, the TDA1251 is a popular choice for audio engineers looking to amplify stereo audio signals with clarity and precision.

Schematic TDA1521 power amplifier circuit 2x 12W

Characteristics TDA1521 power amplifier circuit 2x 12W

1.  Using an AC dual 12V transformer, the actual working voltage after rectification is about ±16V Comment
2. Suitable for the most common 5V, 12V low-power DC cooling fans

Assembly precautions

1. It is recommended to use a 220nF film capacitor for coupling.
2.  Must install a heat sink! Must install a heat sink! Must install a heat sink! Otherwise, prolonged operation may cause overheating and damage!
3. It is recommended to use a larger heat sink, especially if the fan is not actively cooling.
4. It is recommended to add a heat sink to the three-terminal voltage regulator supplying power to the cooling fan, especially when using 7805, as heat generation is extremely high when voltage drops.
5. It is recommended to use an AC dual 12V transformer with at least 50VA (50W) of mains frequency.
6. Since you want to make this amplifier, remember to choose a better-quality potentiometer to prevent poor contact noise from the potentiometer after prolonged use.

BOM TDA1521 power amplifier circuit 2x 12W