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Chip Amps Amplifiers based on integrated circuits

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Old 19th September 2008, 01:56 PM   #31
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What kind of noise would you expect? As you can see on the picture the powersupplys are very close to the aplifier PCB's. But from my experiance the results are better than everything I tried before. Even when everything is quiet (by night) and the volume is set to normal values I hear absolutely no noise out of the speakers. ( I hope this has nothing to do with my hearing )
This kind of powersupplys work with frequencys around 100KHZ which is out of the audio range. So I think it is better than 50 or 60 Hz of an ordenary linear PWS configuration.
Or imagine you would try to filter 100KHz and 50Hz with the same capacitor. The filter effect will be much higher on 100KHz.
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Old 19th September 2008, 02:36 PM   #32
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Quote:
Originally posted by dynabok

By the way, I come up with a idea, is it possible that we can make them as module, for example: make power supply as a module, make regulator as a module and make chip amp as module(1875 chip amp as a module, 3875 chip amp as a module, 3886 chip amp as module).
so that we can change the chipamp and hear different sound from different chip and different circuit design? and also we can change the different regulator to see how it can affect the sounds, how about this idea?

The idea is not bad for "The Big Final Chipamp Test" presented to an audience that has to vote, but can not see which module is connected.
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Old 19th September 2008, 05:34 PM   #33
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If you had used the switching power supply OR batteries for the test, you might could learn the differences between the chipamps; but, the test would not reveal any information about which is the best because the chipamps would not have been optimized for their given application.
Yet these differences could be useful towards revealing application specific information.
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Old 20th September 2008, 07:10 PM   #34
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1
I started with TA2020(amp6,from 41hz).It had much more separation in the low frequency,compared to entry level HT amplifier.Still too bright for my taste.

2
Next was an TDA2052 amp,made from scrap parts for workbench use.Tested it one day with proper size speakers and was hooked.The sound was smooth as velvet.Unfortunately the bass wasn't as good as with the D-class.
This amp was in use while the next project was completed.

3
Now I'm listening, surprise surprise,Lm1875 gainclone with regulated PSU.This one I like a lot.The low frequency is taken care of with amp6.Best of both worlds...

All is subjective ofcourse.
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Old 21st September 2008, 07:03 AM   #35
eketehe is offline eketehe  Indonesia
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Yep :
different chipamp = different sound? = .. i don't know by now
but different speaker = different sound? = hell yes!
why don't try a different pre - amp?.

the 5 pin series are my favourites, for the easy instalation.
i remember when i did hundreds mods before finalize my first lm1875 amp.
last time i'm finished my inv lm2030 + pedja's buffer in the same board, the same psu for the buffer,without regulator, n sounds just great. Amen.

well, sometimes i finaly find their perfect utility,
1875 for big n good efficient drivers,
surprise surprise 3886 good for small severe 4' 2 way
TDA1514a is heard so much like 3875,average.
TDA7394 dual bridge is best for car's.
bridged TDA7294 good for sub-woofer,
tda2005 stereo otl sounds better than its btl.
lm386 + nokia charger + light 4' paper just enough for pc's.

maybe someone will help tells what chipamp sounds close to class A?
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Old 27th September 2008, 06:16 PM   #36
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My vote : LM1875 on SLA'S.
tube pre and lowther DX3 in MLTQWP.
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Old 28th September 2008, 05:09 PM   #37
cronos1 is offline cronos1  Romania
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Default TDA

After a class D amp with 2 darlingtons (BDX66,67)/channel, for me, the best is the amp what I've build after the producer's schematics with TDA2030A as driver for the pair BD911,912.
For my sub, (150W, 8 ohms) I use a bridge with 2 TDA7294 and it works VERY good. (power supply: +/- about 30V at nearly ful load, from a transformer 2X25V ac)
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Old 28th September 2008, 06:23 PM   #38
wazzy is offline wazzy  Zimbabwe
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Default favourite chip amps

at the moment i'm using tda7294 as the main amp in my system, i'm using 45volt rails and as long as you stay within the limits of the protection circuits it is very detailed amp not even using any eq! pretty serious dynamics. i have a little lm1875 and i find the sound warmer than the tda, more relaxed anyone else have the same experience?
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Old 29th September 2008, 06:12 AM   #39
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Default LM3875 question

Some weeks ago i "found" a Technics SA AX720.

Seems to work fine, i connected every speaker i had to it and it sounded pretty decent.
the 720 however requires an amplified subwoofer.
I wonder if i can hook up a home made 3875 amp (would be my first 3875) onto the designated connector
i don't need a woofer that will shake the neighbor's dinner, jsut enough to reflect the low notes.


Thanks

fyi i did build several 1875's and they turned all out to be decent amps, they are all except for one, spread all over Seattle
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Old 30th September 2008, 08:51 AM   #40
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Default Re: LM3875 question

Quote:
Originally posted by uvodee
Some weeks ago i "found" a Technics SA AX720.

Seems to work fine, i connected every speaker i had to it and it sounded pretty decent.
the 720 however requires an amplified subwoofer.
I wonder if i can hook up a home made 3875 amp (would be my first 3875) onto the designated connector
i don't need a woofer that will shake the neighbor's dinner, jsut enough to reflect the low notes.
Yes, of course, but you might enjoy LM3886's remarkably clear bass and its abilities with 4 ohm (subwoofer) loads. After all, your movie entertainment style unit will make demands and either those are met or there's clipping. I think that LM3886 will be able to meet the demands of the movie-centric subwoofer output channel effects.

Sometimes you see it doing just that:
http://www.mcmelectronics.com/product/50-6277
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