TEA2025B is a analog stereo audio amplifier with an output power up to 3W. It requires a single end positive power supply up to 15V. The amplification mode could be selected as bridge or stereo mode.
To make it work, it just require only a few passive components.
A completed PCB Project
Copper Soldering Side
A remaining of TEA2025B I bought from Ali Express for 2 $.
Pin Diagram Of TEA2025B 16-Pin DIP Package
Block Diagram Of TEA2025B From The Device Datasheet
Between bridge and stereo mode, I preferred a stereo application.
Stereo application circuit
For stereo mode there are relation to calculate for.
The voltage could be calculated as follow.
Stereo Voltage Gain Configuration
The output capacitor determines the low cut off frequency. It also depend on the output load value.
When COUT = 470 uF and RL = 4 Ohm, the cut off frequency is 80 Hz.
Schematic And PCB Design
Completed project was done with Proteus 8 due to its simple and light weight design requirements.
Schematic Diagram
The symbol of TEA2025B I draw it by myself due the lack of analog IC symbol in the library. The power supply I test with this design is a 12 V regulated DC supply. It works well at 12 V.
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