Circuit on Stereo system earphone amplifier

LM4910 Circuit on Stereo system earphone amplifier

LM4910 from the Boomer sequence of Nationwide Semiconductors is a stereo audio system firm mainly ideal for stereo audio system earphone programs. The IC can be controlled from 3.3V ans its can produce 0.35mW result power into a 32 ohm fill. The LM4910 has very low distortions ( less than 1%) and the turn down present is less than 1uA. This low turn down present makes it ideal for power provide powered programs. The IC is so designed that there is no need of the result combining capacitors, half provide by-pass capacitors and bootstrap capacitors. Other features of the IC are turn ON/OFF press reduction, on the outside automated obtain etc.

Circuit Diagram

Circuit diagram of the LM4910 stereo earphone firm is shown above.C1 and C2 are the reviews DC decoupling capacitors for the eventually left and right reviews channels. R1 and R2 are the specific reviews resistors. R3 is the nourish again resistor for eventually left route while R4 is the nourish again resistor for the right route. C3 is the power filter capacitor. The reviews resistors also sets the closed loop gain in conjunction with the corresponding reviews resistors.

Notes

The IC is available only in SMD offers and care must be taken while soldering.
The routine can be operated from anything between 2.2V to 5V DC.
The fill can be a 32 ohm earphone.
Absolute highest possible provide current is 6V and anything above it will eliminate the IC.
A sense low current at the turn down hooks turn downs the IC and a sense hollywood at the same pin triggers the IC.