A very simple audio amplifier electronic project that can be used in small portable audio applications can be designed using the TEA2025 audio amplifier IC . This audio power amplifier project supports a wide input voltage range between 3 and 15 volts .
Input capacitor is PNP type allowing source to be referenced to ground.
In this way no input coupling capacitor is required. However, a series capacitor (0.22uF)to the input side can be useful in case of noise due to variable resistor contact.
The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors (100μF) avoids a reduction of the output signal also at low frequencies and low supply voltages.
The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected between pin 6 (11) and ground. The frequency response is given approximated Input capacitor is PNP type allowing source to be referenced to ground.The frequency response is given approximated : VOUT/VIN= R1/(Rf +R2 +(1/JWC1))
The maximum output power that can be obtained using the TEA2025 audio amplifier in stereo mode is around 2.3 watts on a 4 ohms load .
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