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Old 17th March 2014, 08:19 AM   #1
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Default Need a recommendation for an IC amp.

I'm looking for a good quality single or two channel IC (single channel IC may be better suited) that can run on a +/-25 to +/-30v supply. Minimal external components would be ideal.

I'd be fine with a pre-built ebay board if someone knows a good one.

I have a nice toroid transformer to use on a project and need a small amp for my computer to power some bookshelf speakers.

TDA2050? LM3886? others?

Last edited by lazzer408; 17th March 2014 at 10:49 AM.
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Old 17th March 2014, 04:26 PM   #2
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If you give more info about your speakers, people will be better suited to offer suggestions.

I would look at the LM1875
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Old 17th March 2014, 10:03 PM   #3
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I have 8" Sony 8-ohm 3-way, 5" Sony 8-ohm 2-way, and 5" Wharfedale 6-ohm 2-way. There's nothing unique about any of the speakers I'll be driving.

How is the LM1875 vs. TDA2050? Similar?
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Old 17th March 2014, 11:45 PM   #4
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you shouldn't use an LM1875 or TDA2050 at +/-25V rails if your speakers average impedance is rated at 6ohms - as the speakers actual impedance can drop to 4ohms. This would draw much more current than each of these little chips can deliver at this voltage.

I would recommend you use an LM3886 or LM3875. These chips will happily drive your speakers at the voltages you quoted.
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Old 18th March 2014, 01:29 AM   #5
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I had good luck with the LM3886. With +/- 32 volt rails, I got about 50 watts rms into 8 ohms. They sound great to my ear. It doesn't get much easier, and there are a bunch of circuits and boards you can buy on the web. Linkwitz uses the 3886 in his Pluto biamp'd speaker system, and his circuits are on his website.
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Old 18th March 2014, 09:57 AM   #6
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I went with a TDA7294. I'm going to try it out and see how I like it. If I don't I'll try the LM3886.

Here's the DS on it. http://www.st.com/st-web-ui/static/a...CD00000017.pdf
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Old 18th March 2014, 01:39 PM   #7
Mihkus is offline Mihkus  Estonia
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TDA1514,7293,4 LM1875,3876,3886...
Id go for 3875 because I havent found any use for mute so far, seems totally pointless.
But I think those chips are all rubbish, go for class discrete.
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Old 19th March 2014, 01:18 AM   #8
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The mute function on the 3886 means there's no turn-on transient. I like that a lot. Also, a chipamp will have tighter coupling between the output devices and the temp sensing circuit, so reliability and minimization of crossover distortion is likely better than with a discrete design. I'm not saying chipamps are necessarily better than any discrete design, just that I wouldn't rule them out.
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Old 19th March 2014, 02:45 AM   #9
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Quote:
Originally Posted by Bob Richards View Post
The mute function on the 3886 means there's no turn-on transient. I like that a lot. Also, a chipamp will have tighter coupling between the output devices and the temp sensing circuit, so reliability and minimization of crossover distortion is likely better than with a discrete design. I'm not saying chipamps are necessarily better than any discrete design, just that I wouldn't rule them out.
The TDA7294 also has a mute function, it appears that you can use it in a similar way to the LM3886 mute pin.

lazzer408 will you be buying a kit or designing your own circuit?
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Old 21st March 2014, 10:07 AM   #10
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Originally Posted by Oliphant View Post
The TDA7294 also has a mute function, it appears that you can use it in a similar way to the LM3886 mute pin.

lazzer408 will you be buying a kit or designing your own circuit?
Ok long story short...

I'm going to (eventually) be building a 6BQ5 4ch amplifier for my car. I'm in the testing stage trying various PI designs on a home chassis and a friend ordered some Edcor 4-ohm UL OPTs to try as well. In the mean time, I need an amp that's quick and easy and started looking into the chip amps. I had a few chip-amp boards laying around, that were pulled from various computer speakers, and one of them was used in a subwoofer and had a dual-rail supply. I gutted the low-pass section from it and gave it a listen. I was quite pleased with how it sounded. It blew away (in quality) this Technics receiver I use often for testing. Not that that's saying much. The chip amp sounded more like my tube amp then some of these other discrete output receivers I have.

So... I ordered a stereo chip amp off Ebay that uses a pair of TDA7294 for each channel. I let the power rating get to me again. If anything I'll get 4 chips off it.

Seems like there's a lot of people who like the LM3886. Is it really good compared to other ICs?
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