Please Help!!! me decide on a chipamp

Morning_Star · 12th September 2006, 08:40 PM

I was excited to start on a chip amp but with so many variations out now I don't know where to start. There are some specific things that I am looking for though.

I'm looking for a gainclone that has

- atleast 25-50w per channel
- the least THD% and most headroom as possible (S/N%)
- two sets of balanced trs inputs instead of RCA that is selectable
- outputs to have speaker outs as well as trs that is selectable

I will be using it for my studio amplifier to power my monitors. I'm guessing I will need to add a stage for the balanced to unbalanced on the input and then another unbalanced to balanced stage on the output. Also I don't know what kind of summing circut to use for the selector switch on the input and output to ensure no added noise. And I would like a line output for a headphone amplifier. Please...... any help is appreciated. Thanks.

N-Channel · 12th September 2006, 09:12 PM

Hi ______,

Have a look at National's LM4765 from their Overture series of ChipAmps. It has really good S/N and THD Figures (108dB @ 25W, and 0.009% THD at 1kHz). Slew Rate's not too bad: 12-18V/mS. The '4765 is actually a dual channel chipamp that will easily bridge (for balanced input-output operation) or parallel (for increased drive capability).

Here is the link: http://cache.national.com/ds/LM/LM4765.pdf

Give it a look.

Cheers,

Steve

ifrythings · 13th September 2006, 03:16 AM

The TDA7293(4) series have good specs.... 100W@8ohm
THD is 0.005% and 10V/uS SR, its able to do 4 ohm no problem and it has a differential input stage so you can use RCA or balanced pair

it also has a slave function so you can run several in parallel with no problem and acording to the datasheet it also has a clipping detector built in

( I could be mistaken though)

Just my few points

David

SpittinLLama · 13th September 2006, 04:23 PM

Keep in mind ST often stretche their specs some. The parallel slave ability is really cool though.

-SL

Leolabs · 14th September 2006, 02:59 PM

Hi Morning Star!Why not go for the simplest and popular LM3875???

12th September 2006, 08:40 PM	#1
Morning_Star diyAudio Member Join Date: Apr 2006 Location: Atlanta, Ga	Please Help!!! me decide on a chipamp I was excited to start on a chip amp but with so many variations out now I don't know where to start. There are some specific things that I am looking for though. I'm looking for a gainclone that has - atleast 25-50w per channel - the least THD% and most headroom as possible (S/N%) - two sets of balanced trs inputs instead of RCA that is selectable - outputs to have speaker outs as well as trs that is selectable I will be using it for my studio amplifier to power my monitors. I'm guessing I will need to add a stage for the balanced to unbalanced on the input and then another unbalanced to balanced stage on the output. Also I don't know what kind of summing circut to use for the selector switch on the input and output to ensure no added noise. And I would like a line output for a headphone amplifier. Please...... any help is appreciated. Thanks.

12th September 2006, 09:12 PM	#2
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	Lm4765 Hi ______, Have a look at National's LM4765 from their Overture series of ChipAmps. It has really good S/N and THD Figures (108dB @ 25W, and 0.009% THD at 1kHz). Slew Rate's not too bad: 12-18V/mS. The '4765 is actually a dual channel chipamp that will easily bridge (for balanced input-output operation) or parallel (for increased drive capability). Here is the link: http://cache.national.com/ds/LM/LM4765.pdf Give it a look. Cheers, Steve

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13th September 2006, 03:16 AM	#3
ifrythings diyAudio Member Join Date: Oct 2005	The TDA7293(4) series have good specs.... 100W@8ohm THD is 0.005% and 10V/uS SR, its able to do 4 ohm no problem and it has a differential input stage so you can use RCA or balanced pair it also has a slave function so you can run several in parallel with no problem and acording to the datasheet it also has a clipping detector built in ( I could be mistaken though) Just my few points David

13th September 2006, 04:23 PM	#4
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	Keep in mind ST often stretche their specs some. The parallel slave ability is really cool though. -SL

14th September 2006, 02:59 PM	#5
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Hi Morning Star!Why not go for the simplest and popular LM3875???

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