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• Transcript for Audio Amp #HackChat

  Lutetium • 03/31/2017 at 20:18 • 0 comments

  Sophi Kravitz so... welcome Jørgen! Let's start!

  Jørgen Kragh Jakobsen I am located in Denmark (æøå) Copenhagen - eengineer at startup Merus Audio we do the most advanced class D amplifiers 2x40W and 2x70W with analgo or digitla input

  Yann Guidon / YGDES Do they use multiple voltge to save power ?

  Jørgen Kragh Jakobsen At nigth time i am tinkering on embedde device and can see that technologi will start to disrupt the way we use to designe audio systems. But let me get back to that later.

  Jørgen Kragh Jakobsen http://www.merus-audio.com/images/extranet_download/New_Multi-Level_Class-D_Audio_Amplifier_Supports_Ultra-Compact_and_Low-Power_Applications.pdf

  Jørgen Kragh Jakobsen Posted a link by my colleage Rien - You mite need the username and password to get to it - let me know
  
  Yann Guidon / YGDES Ah I remembered reading something about this approach a few years ago :-) You pack enormous power in really tiny spaces so you must avoid dissipating anything :-)
  
  Sophi Kravitz how does that work?
  
  Jørgen Kragh Jakobsen Yes in normal class A and AB you have at least 25% in you device rest goes to speakers
  
  Jørgen Kragh Jakobsen in class D you are down to 5% loss in device
  

  Jørgen Kragh Jakobsen and not a big problem before you start to play party level - normal pcb coolign is ok

  
  

  Yann Guidon / YGDES What frequency does it use ? are there crazy clock techniques ?

  Jørgen Kragh Jakobsen Also for EMC we have some trick to do usign 5 level swithcihg

  Yann Guidon / YGDES :-)

  Jørgen Kragh Jakobsen we do 300k, 600k or 1200khz

  Jørgen Kragh Jakobsen depenting on input level - and how you setup the amplifier profile

  Jørgen Kragh Jakobsen Save power and do bether THD

  Jørgen Kragh Jakobsen Yes externel filtes is mainly for EMC requiments

  Jørgen Kragh Jakobsen

  Yann Guidon / YGDES cuuuuute !

  Lutetium lol

  Jørgen Kragh Jakobsen
  This amp can do around 2x40w cont. from a shitty supply
  
  Jørgen Kragh Jakobsen
  Analog or digital input
  
  Lucas Coelho Cavalheiro has joined this room.
  
  Yann Guidon / YGDES Oh that would be a perfect fit for restarting my project #Whygeephone :-D
  
  anfractuosity How much does a board like that cost out of interest?
  
  Jørgen Kragh Jakobsen But let get to mika's question
  
  rpstevens What do you think of Gainclone chip amplifiers? I built one a few years ago, seems to work OK.

  Edgar What is the frequency range?

  Jørgen Kragh Jakobsen Gainclone is old stuff - move on to class

  Jørgen Kragh Jakobsen Frequency range is flat upto 20K

  Jørgen Kragh Jakobsen http://www.merus-audio.com/images/pdf/extranet_download/MA12070P%20Product%20Datasheet.pdf

  Jørgen Kragh Jakobsen Please check the spec in datasheet

  Jørgen Kragh Jakobsen back to Mika

  Jørgen Kragh Jakobsen You ar not the first to have problem with stagepass or old amp/audio system in general

  Jørgen Kragh Jakobsen Get hold of schemaics of the amp/mixer

  Yann Guidon / YGDES Are there features in this chip to alter/process/equalize the sound ?

  Jørgen Kragh Jakobsen and try to follow the audio path. You need to look for bad caps used or blocking DC between stage in design

  EdgaI just started looking at the datasheet, it says low power aplications, but voltage is 18v, how many amps?

  Jørgen Kragh Jakobsen or look for noise on supply lines - You need a scope

  RRcoder has joined this room.

  Jairo has joined this room.

  Jørgen Kragh Jakobsen And for Orkhan - every body missing bass ...

  Jørgen Kragh Jakobsen yes try do some calculation on input impeaence vs coupling cap - that is now place you could loose base

  Jørgen Kragh Jakobsen bass

  Yann Guidon / YGDES any information about availability and pricing of small modules ?

  Jørgen Kragh Jakobse other places in the speaker and speaker enclouser. You need large volume and good acustic designe to do good bass

  thekidtonystark I know I asked this before but since more people are here, is there anyone near miami with scraps they are willingly giving

  Jørgen...

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