LME49810, LME49830 or LM4702? BiPolar or Mosfet output? - diyAudio
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Old 26th February 2009, 11:12 AM   #1
sendler is offline sendler  United States
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Default LME49810, LME49830 or LM4702? BiPolar or Mosfet output?

Has anyone listened to any of these amp modules?
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http://www.chip-pcb.cn/en/CP%20home.htm
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I am trying to decide between the M-9810-C+, M-9830-B, and M-4702-I or H for hi end home audio in a digital active cross 3-way with my direct out modified DCX2496.
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He also has an interesting concept of running the driver chip at 5v higher than the output rails which would be a hassle to implement but might keep the chip in the range of it's lowest distortion when pushing big current.
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The site is tricky to navigate at first. drop down from the amp modules tab and click on one of the driver chips, then go back up to the pathway bar that appears just above the module tab to click on the different variations that are offered for each chip.
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Pricing is cheap for completed modules if you can really get them. $60.00 or so. Or just buy the boards and order the parts.
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Old 26th February 2009, 11:56 PM   #2
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The question you are asking is subjective. Some swear by BJT and others think FETs sound better. If you really want to decide by sound quality the only way is to do the test yourself and choose what you think sounds best. Since the price is right for you, I'd say go for it.

The idea of higher supply on the driver when using FETs is pretty old, actually.

-TH
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Old 27th February 2009, 12:13 AM   #3
fab is offline fab  Canada
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Default Re: LME49810, LME49830 or LM4702? BiPolar or Mosfet output?

Quote:
Originally posted by sendler
Has anyone listened to any of these amp modules?
.
http://www.chip-pcb.cn/en/CP%20home.htm
.
...Pricing is cheap for completed modules if you can really get them. $60.00 or so. Or just buy the boards and order the parts.
I have ordered and received 2 kits + 2 PCB (alone) from this web site and it arrived home (in Canada) about 10 days after order with no bad surprise (no extra fee). It came very well packed with even the resistor values written close to them. The parts are first quality and I doubt you can get a better price than the one charged for the kit.

I have assembled one kit of LME49830 for electrical test but no sound test yet. Maybe in one month or so I will install the kits in one of my DIY amp chassis. I received also 2 PCBs for the regulated supply which I have not assembled yet.

Good luck
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Old 27th February 2009, 04:44 PM   #4
sendler is offline sendler  United States
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Default Listening

Quote:
Originally posted by SpittinLLama
The question you are asking is subjective. Some swear by BJT and others think FETs sound better. If you really want to decide by sound quality the only way is to do the test yourself and choose what you think sounds best. Since the price is right for you, I'd say go for it.

The idea of higher supply on the driver when using FETs is pretty old, actually.

-TH
That's what I was looking for. A subjective opinion from someone who has actually listened to any of these circuits side by side to try to save me from buying all of them to find out the differences. But I guess these driver chips are not as well known here as I thought. Too bad the web site doesn't answer any emails.
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Old 27th February 2009, 04:49 PM   #5
sendler is offline sendler  United States
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Default good service?

Quote:
Originally posted by fab


I have ordered and received 2 kits + 2 PCB (alone) from this web site and it arrived home (in Canada) about 10 days after order with no bad surprise (no extra fee). It came very well packed with even the resistor values written close to them. The parts are first quality and I doubt you can get a better price than the one charged for the kit.

I have assembled one kit of LME49830 for electrical test but no sound test yet. Maybe in one month or so I will install the kits in one of my DIY amp chassis. I received also 2 PCBs for the regulated supply which I have not assembled yet.

Good luck
It sounds like you received good service from the web site. When did you order? I am a little leary in doing international buissiness with someone that won't even return an email to tell me which of of few very similar products that they recommend for me to buy.
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Old 27th February 2009, 05:38 PM   #6
AndrewT is offline AndrewT  Scotland
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I have just sent an Email enquiry.
I'll update with news.
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Old 27th February 2009, 09:42 PM   #7
fab is offline fab  Canada
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Default Re: good service?

Quote:
Originally posted by sendler

It sounds like you received good service from the web site. When did you order? I am a little leary in doing international buissiness with someone that won't even return an email to tell me which of of few very similar products that they recommend for me to buy.
I ordered at the beginning of February. I got replies to my e-mails but sometimes it takes a few days. The guy appears to be very busy. But after all, for me, the process is even more faster than some orders I did in the past in the US (but have in mind that it needs to go through customs from US to Canada). I even made a suggestion for a separate output board PCB or kit (for multiple parallel trannies) and he replied that he would seriously consider it.
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Old 28th February 2009, 12:18 AM   #8
sendler is offline sendler  United States
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Quote:
Originally posted by AndrewT
I have just sent an Email enquiry.
I'll update with news.
.
Thanks. Maybe it's my Verizon email not letting him through.
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Old 28th February 2009, 12:41 AM   #9
sendler is offline sendler  United States
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Default Kit

Quote:
Originally posted by fab


I ordered at the beginning of February. I got replies to my e-mails but sometimes it takes a few days.
.
Did you ask him about the various kits or just pick the 9830 your self? The 9810-C+ seems to be his top pick from what I can gather from the limited descriptions but modules AND kits for that are "out of stock". Maybe this is old text he hasn't changed since working with the 9830 with mosfets. Are all of the other kits except 9830 and 4702 out of stock because he has decided just to carry those 2 circuits and gave up on the rest? You didn't want to pay him the extra $5 to assemble it for you? $5 of my time would last about 15 minutes tops. Beyond that I would be glad to let him do it.
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Old 28th February 2009, 03:38 AM   #10
fab is offline fab  Canada
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Default Re: Kit

Quote:
Originally posted by sendler

.
Did you ask him about the various kits or just pick the 9830 your self? ....
You didn't want to pay him the extra $5 to assemble it for you? $5 of my time would last about 15 minutes tops. Beyond that I would be glad to let him do it.
I just knew what I wanted but I asked about combining 2 orders in the same shipment and he did it so I could save some money (even if the shipping is not expensive to travel half the world...).

I was not sure if there is a good quality assembly and I wanted to modify several resistors ,install the double poles compensation and use Lateral mosfets instead of the provided IRFP240/9240. Also, the 47uf feedback cap is a little low value for my taste. You can clearly see the tilt with 20 Hz Square wave with a scope.

I think heis a member of this forum or someone on this forum has something to do with the chip-pcb.cn.
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