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Need low-power amplfier audio for PCs, laptops, and smartphones at home? TEA2025B stereo audio amplifier can be a suitable choice for you to assemble into an amplifier. TEA2025B is an IC containing two power amplifiers that can be used for stereo 2 Watts + 2 Watts or bridge power to get more power.

Single voltage supply for TEA2025B ranging from 3 Volts to 12 Volts with voltage gain ranging from 43 dB to 53 dB. What is interesting is that the input impedance is high (30 KOhm) so that it does not overload the circuit behind it.

The power emitted depends on the working voltage and load of the speakers used. For example, a working voltage of 9 Volts with a speaker of 4 Ohms can be generated from 1.7 to 2.3 Watts of power. However, if using a voltage of 6 Volts, the power obtained a maximum of 1 Watt.

I've tried testing this amplifier with 3s battery Li-Ion 18650 & holder as a power supply (DC 12V), and the output is connected to two 2 inch 4 ohm speakers, to amplify audio output from a Sony Ericsson smartphone, and it can run pretty well. Circuit diagrams and PCB layout can be seen in the video above.

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