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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st August 2011, 10:02 PM   #41
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Join Date: Feb 2010
Location: Powell River, BC Canada
Quote:
Originally Posted by ljm_ljm View Post
Nice to your attention.

The two are all I have provided.

L20D is the first one, mono versions, I design.

Another double track is provided by the company of IR sample, it has more restrictions.

Including the voltage, over-voltage protection, and the output of the dc disconnect PWM protection function.

Suitable for a double track the amplifier. Or, more like IRAUDAMP7 reference version of friends.

It is also very low distortion, I believe that IR engineers can be fully play AMP7S-200 performance.

Also thank their reference version of the design let me get reference model.
Thank you very much for your information.

Have a wonderful day.

Rod
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Old 24th August 2011, 05:43 PM   #42
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Location: Toronto, ON, Canada
What's the PSRR on this amp?
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Old 25th August 2011, 04:29 AM   #43
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Hi.....,

I'm interest to build this amp, but i'm not expert in electronic

can someone please let me know, is this hard to build?
I'm planning to build 5 channel power amps using L20D, i have 625va 2x40v toroidal transformer and 6 x 18000uf 63v capacitor for psu is that enough?

Please help! Advice would be really appreciated

Jopie
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Old 25th August 2011, 06:01 AM   #44
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This module comes pre-assembled.
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Old 26th August 2011, 01:31 PM   #45
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Quote:
Originally Posted by Jim McPherson View Post
I too would love some suggestions on a good source for a power supply for 8ohm operation of the L20D. Is there a better value than the Connexeletronics SMPS800R @ +/- 72v?
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Old 26th August 2011, 01:47 PM   #46
trevmar is offline trevmar  United States
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Quote:
Originally Posted by Jim McPherson View Post
Is there a better value than the Connexeletronics SMPS800R @ +/- 72v?
I would like to be able to help you answer this question, but I have had a Connexelectronics 72V power supply on order since August 1. On August 13 I received the following answer when I asked about a shipping date: "voltages different than default ones require custom transformer, and takes more .. i should get it next week, install test and send. as soon as i get the trk number i send you, please wait till then"

It is August 26th. When I get a tracking number, or actually a power supply in my hands, I will post my assessment here...
.
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Old 27th August 2011, 08:10 AM   #47
ljm_ljm is offline ljm_ljm  China
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Here are a L20D about the most basic of the connection diagram.

I think it will help.
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Old 28th August 2011, 01:13 PM   #48
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Quote:
Originally Posted by trevmar View Post
I would like to be able to help you answer this question, but I have had a Connexelectronics 72V power supply on order since August 1. On August 13 I received the following answer when I asked about a shipping date: "voltages different than default ones require custom transformer, and takes more .. i should get it next week, install test and send. as soon as i get the trk number i send you, please wait till then"

It is August 26th. When I get a tracking number, or actually a power supply in my hands, I will post my assessment here...
.
I ordered one as well, and have heard nothing about shipping at all. Very poor communications from Connexeletronics.

-Jim
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Old 28th August 2011, 02:08 PM   #49
Cristi is offline Cristi  Europe
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Jim,

i have sent you few mails already, last one one hour ago. please check and reply. i told you in a previous mail that i haven't got the mail from you. is not something new, 1 out of 10 messages are not getting tru maybe has something to do with this. Google
i also use a yahoo account with the same name, i wrote about this in the threads at Connexelectronic section. why i not use an email registered on connexelectronic domain ? because this too is working just randomly.

Trevor: one of the power supplies which you ordered required custom transformer, since you asked to be 70V version. i told you and to every customer which order any power supply which require custom transformer that it will take with about one two weeks more than normal time. it is written here as well. Connexelectronic
why it takes longer ? because i have to submit a new order for transformer(s) at factory and they would not make it if there are at least 5-10 pcs. so on one hand i have to gather at least 5 transformers from 5 orders or just make few more even if i need just one. and for some voltages, i really don't need to make stock. even so, it cost more than 15 usd for a small transformer to make if is just sample, as considered by the factory when i order few pcs. the alternative would be to make them myself. i do this, but only for prototypes, i cannot afford to spend 1-2-3 hours making a transformer every time.
one important aspect which customers didn't noticed is that i do not charge anything extra for flexibility of choosing a custom voltage. although the transformers cost about 2-3 times more, in some cases need more expensive diodes or capacitors, and need another hour or two to install, change the feedback resistors, bias, loop compensation, test the power supply. in a customer order an of-the-shelf voltage power supply, i just take it from the available ones, pack, and send. no need all the hassle described above.
I am sorry if i made some ppls to be disappointed by apparently poor services. Having very few customers which really appreciate that i can offer voltages which are not easy available or at reasonable price, and few more which mail me almost daily asking why is not sent yet, i will make a clear list with available voltages, and if anyone will need some voltage which is not available, i will write down clear when placing the order to know this aspect, and it will cost more with 15-25% of the power supply price. in this way i will cover the extra cost, and the customer will realize that it cost more because there is something special about that.

The transformer came last week, i installed and test it for few days, i can't afford to risk to have a DOA smps. i took a picture of the board before packing. i passed the package to the shipping company already.

Another aspect, shipping delays. in the past weeks, in Shenzhen, the city where i am working, was held one important sport event, the 26'th universiade games. this lead to huge shipping delays, packages stuck at china post, and the last moment solution was to send the packages to another city and post them there. some of you will have the surprise to see that the package come from Shanghai, Xiamen, Chengdu.

I am getting mails from some customers saying that i;m not able to conduct my business. i agree. i am not a businessman, i am just an engineer, i do what i do just because i enjoy to do, not for money, i have a daytime job like most of you, and the income which i get from connex would not allow me to abandon for the moment. perhaps if i would do it like a business, just for money, the results would differ, better or worse ???

Because i was offtopic, i would like to ask the moderators to move this post(s) here to not interfere with the current discussion. NEW Audio amplifier kits, modules and many others.

thank you for understanding.
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Old 28th August 2011, 02:39 PM   #50
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Cristi,
I have received the last email from you and look forward to getting the 2 SMPS's from you to build my new amp.

You'll have to excuse us for being a bit antsy. In the world of the internet we expect everything to happen instantly and I know that while running a small business as a part time job that rarely happens. I'm very happy that you are able to make these SMPS for us. You have the best price, features, and flexibility by a long margin when it comes to power supplies for audio equipment.

-Jim
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