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Audio splitter With Amplification

Discussion in 'Audio' started by LightShow, Oct 19, 2016.

  1. LightShow

    LightShow

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    Jun 9, 2016
    Hey all

    I have This small audio splitter which takes one single 3.5mm audio jack and then splits it out 5 ways allthough the output sound is low when all are connected at once.

    i wanted to know if it would be possible to make a 5 way splitter with amplification so that all 5 outputs have a strong audio signal output from the device which preferably should be battery powered..

    Let me Know Your thoughts
    Regards, lightshow

    https://www.amazon.com/6-Way-Stereo-Headset-Splitter-Headphones/dp/B00DQUU8T4
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    hi ya :)

    what is the audio source ?

    a phone or other MP3 player ?
    is there still not enough volume even if the source volume is turned up ?
     
  3. LightShow

    LightShow

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    17
    Jun 9, 2016
    the way i use this setup is usually with a laptop or phone connected to multiple headphones or speakers..
    for small parties we connect 5 UE BOOM's to the splitter and play music that way allthough the volume difference is significant
     
  4. LightShow

    LightShow

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    17
    Jun 9, 2016
    at full volume the splitter sounds like its running at around 60% of volume
     
  5. davenn

    davenn Moderator

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    Sep 5, 2009

    OK
    Im thinking a small audio amp between the source and the splitter .. something based around an LM386 or similar

    maybe eBay has ready made booster amps, try some searching :)
     
  6. LightShow

    LightShow

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    17
    Jun 9, 2016
  7. davenn

    davenn Moderator

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    yup, nice one, just remember you would need 2 of them one for each stereo channel .... maybe there's a stereo version board with 2 chips

    not sure what other small audio amps there are out there, ... we need to keep your battery supply/portability in mind for anything suggested :)
     
  8. LightShow

    LightShow

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    Jun 9, 2016
    i dont have a problem using one for each channel :p allthough im hoping it will all work via something like a 9v battery
     
  9. davenn

    davenn Moderator

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    Sep 5, 2009
    will require something with a bit more guts than one of those. The 9V PP3 is for very low power consumption uses
    depending on how long you want it to run for, either a NiCd, NiMH or LiPO types will be required

    Dave
     
  10. LightShow

    LightShow

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    Jun 9, 2016
    Something rechargeable would be better so maybe a LiPO Would suffice..
    What Current\Voltage Should i be looking for?
     
  11. BobK

    BobK

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    Jan 5, 2010
    A couple of comments.

    LM386 is very old technology and not very efficient. There are 3W class D stereo amplifier available on EBay for a couple of bucks. This would be much better for your application. It would last twice as long on batteries, for example.

    Also, if you are connecting 5 pairs of headphones in parallel, this may lower the impedance enough to give the amplifier problems. Assuming 32Ω, which is typical of earbuds, the impedance would be 6.4Ω which should be fine for the class D amps I am recommending. If the earphones are 8Ω, you cannot parallel 5 of them.

    And one more thing. The LM386 has a minimum gain of 20dB. This is too high and will be driven into distortion by a headphone output. You would need to reduce the level with a divider. (this might also apply to the class D amps, not sure that gain they have).

    IXP
     
  12. davenn

    davenn Moderator

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    Sep 5, 2009
    true
    as I said there I wasn't sure what else is available


    got an example, please, so we are all on the same page
     
  13. LightShow

    LightShow

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    Jun 9, 2016
  14. Audioguru

    Audioguru

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    Sep 24, 2016
    Your music source is designed to drive one pair of headphones, 5 in parallel overloads it which reduces the volume and causes distortion. You need to boost the current, not the voltage.

    The ebay LM386 amplifier has a voltage gain of 200 (!) which is way too high. If you fiddle with its tiny parts then you can reduce its gain, but its minimum allowed gain is 9 which is still too high..

    The ebay class-D amplifier also has too much voltage gain.

    Since the amplifiers amplify their noise (hiss) then if you reduce the input level the hiss will be annoying.
     
  15. davenn

    davenn Moderator

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    cool, but I prefer this variation ... has a built in stereo volume control

    http://www.ebay.com/itm/PAM8403-5V-...id=100623&rk=4&rkt=6&mehot=ag&sd=272315746788

    yes you will
    Operating voltage: 2.5V-5.5V
    with 5.5V being the absolute max
    you could look at using say 3 x 1.2V AA rechargables or maybe a 3.6V LiPO style with appropriate charger
     
  16. Audioguru

    Audioguru

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    The PAM8403 amplifier has bridged outputs so the "splitter" cannot be used because it will short circuit the half of the bridged output of one channel to half of the bridged output of the other channel.

    Also, the PAM8203 amplifier has a gain of 24dB (16 times) which is too high unless you turn down its volume control a lot.
     
  17. LightShow

    LightShow

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    Jun 9, 2016
    davenn likes this.
  18. Audioguru

    Audioguru

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    For headphones you should forget about using this amplifier.

     
    Last edited by a moderator: Oct 21, 2016
  19. davenn

    davenn Moderator

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    Sep 5, 2009
    AG is correct, so the search for something suitable resumes
     
    LightShow likes this.
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