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Chip Amps Amplifiers based on integrated circuits

LM1876T diy HiFi amplifier build, questions, PCB, components, so on..
LM1876T diy HiFi amplifier build, questions, PCB, components, so on..
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Old 22nd January 2013, 03:34 PM   #11
abraxalito is offline abraxalito  United Kingdom
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Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
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Star grounding is what I'm suggesting, every return to GND is individual, none are shared paths.
'The total potential here must be nothing less than astronomical.'
'Nothing less. The number 10 raised almost literally to the power of infinity.'
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Old 26th January 2013, 06:18 AM   #12
Mihkus is offline Mihkus  Estonia
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WoW, i just fried my chip abit....
Had tiny piece of aluminium left on my heatsink when i droped some paste on it...
Now it went hot ~100C.. it works, at least right channel does
But left one will start distorting at around 0,5-1W not before somekind of protection circuit turns on, well, time to order new chip...

Really, it puts out 2W at least as normal sound and protection shut...
But going over the limit turns it on and it starts distorting again.
10€ for such chip isnt bad at all, th sound is super nice and smooth.

Totally worth it.

Should i order 3 new "original" from ebay or 1and a half from local store...
If i burn even the second one, which i may never burn i have new one right on the way or again, need to order another...

The problem could be my sound card, i hooked up my sisters chool project 22W bridge amp to the same output of the PC, it distorted alot, the amps input resistance is so damn low 470R..
Not sure why... yet it distorts but with other it sounds damn sweeet, like my own but 22W bridge.... more like 5W peak

Last edited by Mihkus; 26th January 2013 at 06:22 AM.
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Old 27th January 2013, 04:25 PM   #13
Mihkus is offline Mihkus  Estonia
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I ordered these damn chips and were thinking of making crossovers of these cheapy speakers...
Well, i found that distortion came from broken voicecoil, 1" 8ohm big and badass voice coil got killed by 20W rms, lol.

I clued it back to place also made crossovers and added some support to enclosures making them way stronger and padded all walls, also i had two nice and smooth 2" port tubes laying around, used them as permanent solution of that epic port noise from old ones, i broke them when taking them off, weakest kind of plastic ive ever seen...

BTW, the amp is in perfect shape running super nice and smoooootthhh
Changed input caps to 1uf 400v audyn's caps+ rk27 pot.
Damn sweet sound
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