Switched Mode Power Supplies (SMPS) - Page 29 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Inactive Vendor Forums > Connexelectronic

Connexelectronic Commercial Vendors large & small hawking their wares

 
 
Thread Tools Search this Thread
Old 3rd September 2011, 03:33 PM   #281
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Thomas,
please have a try first with the existing capacitors when the boards arrive. if the overcurrent triggers, let me know and i will tell you what how to deal with.

Esperado,
please wait till next monday, i will try to clarify the product description for each power supply.


Because of some recent unpleasant experiences i have to change the policy regarding the custom available voltages for power supplies. There will be a list with clear defined available voltage values and will be specified with BOLD characters the voltage values on request will require extra time and extra cost. that's because there are just few ppls who really appreciate this and a lot more who only can complain and send mails after mails, one-two-three days after the ordered a power supply asking why it wasn't sent yet, without care that their transformer will take another week or two and 10-20 usd more to be done. I'm not getting rich out of this, and i don't need extra headache and complains every time someone expect his product to be shipped before can actually be done. then there are shipping problems, recent Universiade games in Shenzhen, which brought mess and delay. some packages were stuck at customs for few weeks, without being able to be sent out. it is out of my control what happens after i post a package, and one should understand that i cannot send every package with DHL or UPS. otherwise for some products the shipping will cost more than the product itself.
please read this before order something. and mail me for any question. thank you.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 3rd September 2011, 04:52 PM   #282
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Quote:
Originally Posted by Cristi View Post
please read this before order something. and mail me for any question. thank you.
Thanks, Cristy.
Don't worry, and don"t care with unreasonable customers. I don't believe, if some order any tension custom tension, he don't understand the transformer has to be made, and the SMPS tuned !
But i believe, for sure, that you are both an experienced electronician and a very very nice guy.
My remark was just to help you, then your customers, to find easier the right product from you, and, so, increase your business ;-)
May-be it would be good to separate DC-DC converters from AC-DC SMPS. In the page where they are all listed, to add a line like:
+&-Xv toXv, +yV -yV under the reference.
And a table with all the available tensions, currents and noise for each PSU in the product page.

Well, because i do not used any SMPS for audio, i asked this question: Can-i power on the same SMPS a Class D amp (~300khz) and a linear Class AB one with a emitter follower extra filtering (for treble) without to worry about the 300khz ripple, or did i better use two separate PSUs ?
And an other question about Auxilliary. May i add an other rectifier/regulator branch in order to get -12 V ? In other words, is the auxiliary current limited mainly by the transformer ? And what is the current limit ?

Thanks for your care.

Quote:
Originally Posted by makingmoney View Post
What is the noise measurement on this?
Someone had measured-it on a French forum to -70 to -90db around 125Khz and 10Mhz
Very impressive. It needed to put the SMPS board in a Faraday cage, the noise is mostly RFI.

Last edited by Esperado; 3rd September 2011 at 05:09 PM.
 
Old 3rd September 2011, 11:01 PM   #283
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
Question SMPS800R arrived!

My 2 x smsp800r arrived today!

This might be a silly question but how do I power them up. I will have an external power switch on my case so I simply bridged the switch connection.

When I connect 120V nothing seems to happen on either board. What am I missing

The IEC connectors were not soldered in at my request and and I removed them to solder the supply wires directly onto the board.

Cheers

Thomas
 
Old 4th September 2011, 04:17 AM   #284
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Thomas,
the 110V jumpers are missing, you can see the place for them just in front of the big mains side capacitors. they must be connected together for 110V operation.
recently, i do not connect them, and i let the user connect himself, if he is sure that the available mains voltage is 110V. that's because there are countries with 110/220V like Brazil or the user might live in two countries, like Canada and France.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 4th September 2011, 05:09 AM   #285
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
Hi Cristi,

that is useful to know. With the jumper it works immediately.

I must have missed that in the documentation

Thanks

Thomas
 
Old 4th September 2011, 10:34 AM   #286
diyAudio Member
 
Join Date: Nov 2008
Quote:
Originally Posted by Cristi View Post
Thomas,
please have a try first with the existing capacitors when the boards arrive. if the overcurrent triggers, let me know and i will tell you what how to deal with.

Esperado,
please wait till next monday, i will try to clarify the product description for each power supply.


Because of some recent unpleasant experiences i have to change the policy regarding the custom available voltages for power supplies. There will be a list with clear defined available voltage values and will be specified with BOLD characters the voltage values on request will require extra time and extra cost. that's because there are just few ppls who really appreciate this and a lot more who only can complain and send mails after mails, one-two-three days after the ordered a power supply asking why it wasn't sent yet, without care that their transformer will take another week or two and 10-20 usd more to be done. I'm not getting rich out of this, and i don't need extra headache and complains every time someone expect his product to be shipped before can actually be done. then there are shipping problems, recent Universiade games in Shenzhen, which brought mess and delay. some packages were stuck at customs for few weeks, without being able to be sent out. it is out of my control what happens after i post a package, and one should understand that i cannot send every package with DHL or UPS. otherwise for some products the shipping will cost more than the product itself.
please read this before order something. and mail me for any question. thank you.
On your site:

Since you ship worldwide why not say on your site shipping to US takes 3 weeks (or whatever) to Brazil 2 weeks (or whatever).

Since you don't respond to emails on your site very often, why not say so?

If you ship products only once a week or every 2 weeks why not say so?

Put some connection info for 110v and 220v, and say you don't solder the IEC connector.

Adding grounding info would be good too.


More info is better on your site. Customer expectations will then match what you do.
 
Old 4th September 2011, 10:52 AM   #287
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Thank you for the very useful hints. let me complete some.
-shipping time vary from country to country and i don't remember when the shipping company told me last time that will take more than 2 weeks to any destination. and if there is no special event or public holiday, it does not delay. Right now are some packages which haven't left china and they are moving from Shenzhen to Xiamen then to Shanghai, back to Guangzhou and eventually sent out. HK post messed up few times, they lost some packages and i decided to not use them since then. DHL and UPS are alternatives for expensive or urgent shipping. but they cost too much to afford to send each package with them. everytime when there were some shipping problems i changed the shipping company. 6-7 times in the past 3 years. i realized that none is better than the previous one.
-i reply to mails every day, except days when i;m not in Shenzhen. i spend 2-3 hours doing this. i get 40,50, 60 mails a day, excluding spam. have you sent me a mail and i haven't reply ? sent it again. is free.
i ship products 2-3 times every week. in exceptional cases once a week, but NEVER at two weeks, even during chinese new year i had to go to HK to send packages.
-90% of the customers asked me to NOT solder the connector. first batch of boards had the connectors ready soldered and i had to desolder them all. wasn't funny.
-i will add more infos when i will be able to access the site. imagine that you (me) live in a world where internet is a luxury, although i have it at every step.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 5th September 2011, 01:52 AM   #288
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
Default SMPS800R for Class A/B amp

I finished one channel of the AMB β24 with the SMPS800R. Slow start current limiter works and everything seems to be fine.

Replacing the single big toroid and filter caps with individual SMPS800R per channel saves about 3kg from the build and turns it into a dual mono layout.

Cheers

Thomas

Last edited by thomaspf; 5th September 2011 at 02:17 AM.
 
Old 5th September 2011, 12:42 PM   #289
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Quote:
Originally Posted by thomaspf View Post
I finished one channel of the AMB β24 with the SMPS800R. Slow start current limiter works and everything seems to be fine.

Replacing the single big toroid and filter caps with individual SMPS800R per channel saves about 3kg from the build and turns it into a dual mono layout.
Changes in the sound ? Did your dual mono had a negative effect against the stereophonic image ?
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein
 
Old 5th September 2011, 08:19 PM   #290
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
Here is a picture of the switching ripple from the SMPS800R. Peak-2-peak this is almost 4V. Any ideas for a filter to reduce by at least an order of magnitude, ideally less than 100mV.

Just for reference to output of the VAS stage power supply next to it.

Would this filter be worth trying out http://www.trcelectronics.com/Cosel/pdf/snr-10.pdf?

Cheers

Thomas
Attached Images
File Type: jpg P9056694.jpg (191.2 KB, 276 views)
File Type: jpg P9056696.JPG (139.6 KB, 249 views)

Last edited by thomaspf; 5th September 2011 at 08:35 PM.
 

 


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
switched-mode power suppies Dimitar13 Everything Else 0 19th February 2008 12:50 AM
PFC Switched-Mode Power Supply N-Channel Power Supplies 57 13th June 2005 07:56 PM
Switched mode power supply MMicke Car Audio 3 19th February 2005 10:42 AM
Switched mode power supplies Magura Parts 13 3rd January 2004 05:44 PM
Switched Mode vs Linear Power Supply royalmp2001 Solid State 4 12th July 2002 08:04 PM


New To Site? Need Help?

All times are GMT. The time now is 11:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2