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Thread: Audio Out - amplifier for headphone and speakers?

  1. #1
    Senior Member+ Frank B's Avatar
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    Audio Out - amplifier for headphone and speakers?

    Hi,
    I need a simple headphone/speaker output - Input via SPDIF(best), DACs, or I2S. It should be a small(!), not expensive "breakout"-module or easy to solder (SOIC/DIL) chip, Voltage 5V.
    Best would be 2 channel/stereo.. mono is OK, too.. for speakers perhaps something like 1-3 watts.. (+ loud enough for cheap smartphone headphones)

    Are there any recommendations?

  2. #2
    Senior Member+ KurtE's Avatar
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    I have played around with some Mono chips on some of my boards that hook up to a DAC, which maybe don't have enough power for your needs. I think this one (LM4862) is something like .8watts
    I think there are others in this class like LM4871 that output up to 3w.

  3. #3
    Senior Member+ Frank B's Avatar
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    Hm.. heaphones have a common ground - can I use this chip for headphones?

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    Senior Member+ KurtE's Avatar
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    Quote Originally Posted by Frank B View Post
    Hm.. heaphones have a common ground - can I use this chip for headphones?
    Sorry Frank, I have no idea... Hopefully someone who is more of an EE type can give you some better solutions... I was a CS type person whose last EE class was over 35 years ago. I have mainly used these chips on the board with a small speaker also on the board. Something like a: AST-01508MR-R

  5. #5
    Senior Member+ Frank B's Avatar
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    A single-chip solution seems to be a gap in the market...
    TDA1308 is OK for headphones (cheap breakouts on eBay)

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    LM4862 is bridge output so not a good candidate for headphones.

    TDA2822, 8-pin Dip useful for headphone driver.

    What about Silicon Labs 16- pin SOIC, Si3000 ?

  7. #7
    Senior Member+ Frank B's Avatar
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    Wow.. the Si3000 looks good 12Khz max - not "HiFi", but OK for my use-case. And it seems it can drive both, a small speaker and headphones. Available in Germany..perfect..Great, thank you!

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    Senior Member DD4WH's Avatar
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    Hi Frank,

    not quite sure what you want . . .

    Maybe this:

    https://www.maximintegrated.com/en/p...o/MAX9879.html

    The problem with class A/B amps is that you need quite big output caps (in the range of several 100s F), that makes those amps BIG.

    Class D amps do not need this. (But most are in packages not easy to solder by hand).

    The Si3000 is a codec with a built-in amp, but only handles voice/speech (12ksps sample rate restricts your frequency response to < 5kHz, the specs say 300-3400kHz, so this is telephone quality or lower . . .).

    BTW, I recently found this schematic to add headphones to a class D speaker amp, but I have not tried it out!!!

    https://www.edn.com/design/analog/43...ss-D-amplifier

    Maybe a class D speaker amp IC together with that circuit suits your needs of a stereo speaker amp with the possibility to insert standard headphones with common ground?

    All the best,

    Frank DD4WH

  9. #9
    Senior Member DD4WH's Avatar
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    Frank, have a look at the TPA6011 and the schematic on page 16 of the datasheet

    http://www.ti.com/lit/ds/symlink/tpa6011a4.pdf

  10. #10
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    Quote Originally Posted by DD4WH View Post
    Hi Frank,

    not quite sure what you want . . .

    Maybe this:

    https://www.maximintegrated.com/en/p...o/MAX9879.html

    The problem with class A/B amps is that you need quite big output caps (in the range of several 100s F), that makes those amps BIG.

    Class D amps do not need this. (But most are in packages not easy to solder by hand).

    The Si3000 is a codec with a built-in amp, but only handles voice/speech (12ksps sample rate restricts your frequency response to < 5kHz, the specs say 300-3400kHz, so this is telephone quality or lower . . .).

    BTW, I recently found this schematic to add headphones to a class D speaker amp, but I have not tried it out!!!

    https://www.edn.com/design/analog/43...ss-D-amplifier

    Maybe a class D speaker amp IC together with that circuit suits your needs of a stereo speaker amp with the possibility to insert standard headphones with common ground?

    All the best,

    Frank DD4WH
    Any precautions when using a class D mono amp (1-3watt) to drive 1 side off a headphone?

    Alain

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