Sophi Kravitz so... welcome Jørgen! Let's start!
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 ?
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 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
and not a big problem before you start to play party level - normal pcb coolign is ok
What frequency does it use ? are there crazy clock techniques ?
Also for EMC we have some trick to do usign 5 level swithcihg
we do 300k, 600k or 1200khz
depenting on input level - and how you setup the amplifier profile
Jørgen Kragh Jakobsen Save power and do bether THD
Yes externel filtes is mainly for EMC requiments
Jørgen Kragh Jakobsen lol
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.
What is the frequency range?
Gainclone is old stuff - move on to class
Frequency range is flat upto 20K
Please check the spec in datasheet
back to Mika
You ar not the first to have problem with stagepass or old amp/audio system in general
Get hold of schemaics of the amp/mixer
Yann Guidon / YGDES Are there features in this chip to alter/process/equalize the sound ?
and try to follow the audio path. You need to look for bad caps used or blocking DC between stage in design
I just started looking at the datasheet, it says low power aplications, but voltage is 18v, how many amps?
or look for noise on supply lines - You need a scope
And for Orkhan - every body missing bass ...
yes try do some calculation on input impeaence vs coupling cap - that is now place you could loose base
any information about availability and pricing of small modules ?
other places in the speaker and speaker enclouser. You need large volume and good acustic designe to do good bass
I know I asked this before but since more people are here, is there anyone near miami with scraps they are willingly giving
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