Above circuit diagram is the schematic of 1W stereo headphone amplifier. The circuit is built based TDA2822, designed for use in portable players, radios and other common electronic devices which can use headphone for the audio output.

A 3V power supply/battery can be used to drive headphones providing 20mW in 32 Ohms per channel. This circuit can use 8? small loudspeaker as the audio output, but you need a 9V supply and this circuit will provide 1W power output.

The IC KA2209 is an equivalent to the IC TDA2822, you can use KA2209? if you can”t find TDA2822.

Download datasheet: TDA2822 datasheet

This is the stereo headphone amplifier circuit diagram, built based LM4809. This circuit can be used for stereo headphone amplifier circuit for home audio system, microphone preamplifier, personal computers and PDA headphone amplifier and more.

The LM4809 is known as a stereo audio power amplifier capable of delivering 105mW per channel of continuous average power into a 16 Ohm load with 0.1% (THD+N) from a 5V power supply.

This audio power amplifiers had been designed specifically to deliver top quality output power having a minimal quantity of external components. Because the LM4809 doesn’t need bootstrap capacitors or snubber networks, it’s optimally suited for low-power portable systems.

The unity-gain stable LM4809 could be configured by external gain-setting resistors.

The LM4809 features an externally controlled, active-low, micropower consumption shutdown mode, and also an internal thermal shutdown protection mechanism.

LM4809 Features:

• Active-low shutdown mode
• “Click and Pop” reduction circuitry
• Low shutdown current
• WSON, MSOP, and SOIC Surface Packaging
• No bootstrap capacitors required
• Unity-gain stable

Checkout the LM4809 datasheet by download the document:

LM4809 Datasheet Document

1 file(s) 1.80 MB

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