NEW Audio amplifier kits, modules and many others. - Page 25 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st June 2009, 03:35 AM   #241
ccschua is offline ccschua  Malaysia
diyAudio Member
 
Join Date: May 2008
hi,

can u post a schematic for PS10K40. Would like to order two units but just to confirm whether it fits or not.
  Reply With Quote
Old 1st June 2009, 06:34 AM   #242
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Default Re: TA 2022

Quote:
Originally posted by mtbboyz
Cristi,
This is my first time building a T-amp and I have the ta2022 kit that you sell. I connected everything to a 2X22.5v transformer, using my denon as the source unit through RCA plugs, and my homemade 6 ohm speakers. When I turned on the amp for the first time I noticed the green LED lights up and the amp board begins to buzz. The buzzing is also present in the speakers although relatively quiet. It is present with the inputs disconnected and doesn't seem to change at all with the input source or cables. I tried another pair of speakers with the same exact result. I rechecked all my connections and could find no shorts. I tried a plug with no center grounding prong to see if it was the problem with the chassis grounding but there was no difference. I am confused and I'm hoping someone here may have some suggestions for what I should do to fix this buzzing or if maybe there is a problem with the amp module. Thanks for your time
Chris
Chris,
on this version of the TA2022 amplifier which you have, if the power supply is lower than 27-30V DC, the inductor from the negative supply will make a little noise, because mechanical resonance of the windings and the core, when is working in burst mode. the solution is simple, remove those 2 capacitors which are in front of the rectifier bridge, the 0.22uF at 63V. this are connected between + to GND and - to GND. there are hi-freq by-pass capacitors, but there are few more bypass caps, so this will not have any negative influence. please check and let me know. be carefull which capacitors you remove, if you remove others, may damage the board. ony the 2 caps very close to the rectifier bridge !!!
note that this noise has no negative influence in normal operation of the a amplifier, but it may be annoying if you stick the ear on the board. similar as many SMPS have this noise but they working just fine.

Quote:
Originally posted by ccschua
hi,
can u post a schematic for PS10K40. Would like to order two units but just to confirm whether it fits or not.
i post the schematic, it is the same for all the boards with single differential voltage, only the value of the caps is different.
i check the 22,000 uF at 50V caps, there is no cap with this value which can fit on this board. they are big can type, with screw terminal only. an alternative will be to use the 18,000uF at 71V which fit exactly on this boards, they are 35mm diameter and 100mm long. the total capacitance is enough even for class A amplifiers.

Quote:
Originally posted by hoxuanduc

Please note I inquired about the larger capacitor than that comes standard with the kit
the biggest capacitance caps which can fit on this board are 12,000uF, the model which i use for the TA3020 v2 board. they are 30mmx50mm. for bigger capacitance, may connect in paralel with this caps, next to the board. one good solution will be to use one 18,000uF at 71V connected between V+ and V- this will increase performance, and attenuate pumping effect which ocures at class D and T amplifiers.
Attached Images
File Type: gif ps board.gif (12.5 KB, 521 views)
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
  Reply With Quote
Old 1st June 2009, 09:42 AM   #243
wimpos is offline wimpos  Belgium
diyAudio Member
 
Join Date: Apr 2009
Hi CNX

I received the 2 TDA8920TH kits last tuesday. Thank you for your good service.

As a beginner I still have some design questions.

- In the specs you mention I still need an input stage. Googling I still cannot find what exactly that is I need. Can you point me out how I can make an input stage.

- Power supply. Each kit needs a power supply 2x20Vac 6A
is it possible to power the 2 kits with one transformer. (kits in parallel)
Would this be a good idea? http://www.amplimo.nl/index.php?page...id=134&lang=nl

Or would a smps be a better choice?

Are there some books you use with amplifier info?

Thank you
Wim
  Reply With Quote
Old 1st June 2009, 09:55 AM   #244
ccschua is offline ccschua  Malaysia
diyAudio Member
 
Join Date: May 2008
HI,


for your PS10K40, can I know the capacitor ESR and the operating life ? What is the make of the MUR , On semi ?

rgds.
  Reply With Quote
Old 2nd June 2009, 08:42 AM   #245
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Quote:
Originally posted by ccschua
HI,

for your PS10K40, can I know the capacitor ESR and the operating life ? What is the make of the MUR , On semi ?

rgds.

i measured the 18,000uF at 71V caps ESR, they have about 5 mOhm. this is a very low value, not too many caps have ESR so low. the capacitors life is depending on the ripple current and working temperature. the minimum operating life is 4000 hours at 85*C and maximum ripple current. the operating life rise exponentially if the temperature or ripple current decrease, so values of 100,000 hours or more are very common.
the diodes are made by ON Semi.
Attached Images
File Type: jpg dsc06469.jpg (78.6 KB, 448 views)
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
  Reply With Quote
Old 2nd June 2009, 08:55 AM   #246
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Quote:
Originally posted by wimpos
Hi CNX

I received the 2 TDA8920TH kits last tuesday. Thank you for your good service.

As a beginner I still have some design questions.

- In the specs you mention I still need an input stage. Googling I still cannot find what exactly that is I need. Can you point me out how I can make an input stage.

- Power supply. Each kit needs a power supply 2x20Vac 6A
is it possible to power the 2 kits with one transformer. (kits in parallel)
Would this be a good idea? http://www.amplimo.nl/index.php?page...id=134&lang=nl

Or would a smps be a better choice?

Are there some books you use with amplifier info?

Thank you
Wim

the input stage is necessary because the TDA892x amplifiers have fixed gain, and in some cases the input level provided by some audio sources may not be enough. depending on your application, the preamplifier can be chosen. if you want to use with CD/DVD, this may provide enough level, but other audio sources may need a simple one-two stages preamplifier.

you can use a single transformer to power two modules, if the transformer has enough power rating (at least 350W). also, is higly recommended that the transformer to have 2 symetrical windings, and use them separate for each amplifier, as you have 2 transformers. the transformers from the link which you post may be a good choice, but i didn't saw 2x20V model. a better choice will be to use 2 transformers like this: http://www.amplimo.nl/index.php?page...id=134&lang=nl

aout SMPS, also can be used, i have a model which fit for this amlplifiers, i hope that this month i will be able to release already.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
  Reply With Quote
Old 2nd June 2009, 09:37 AM   #247
ccschua is offline ccschua  Malaysia
diyAudio Member
 
Join Date: May 2008
Hi CNX,

Do u supply capacitors ?

I need 8x22,000uF about 25V, or 35V ship to Malaysia.

Also do u have MUR 3060 ? I need 8 pieces .
  Reply With Quote
Old 2nd June 2009, 10:45 AM   #248
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
yes, i can provide you capacitors and diodes.
i have a better offer. Cornell Doublier caps, 52,000uF at 30V. pls contact me by mail for more details
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
  Reply With Quote
Old 2nd June 2009, 10:47 AM   #249
xaudiox is offline xaudiox  Philippines
diyAudio Member
 
xaudiox's Avatar
 
Join Date: Jul 2006
how much are those 52mF caps cnx? thanks
  Reply With Quote
Old 2nd June 2009, 11:54 AM   #250
ccschua is offline ccschua  Malaysia
diyAudio Member
 
Join Date: May 2008
mail sent. kindly reply fast. need to make decision soon. tks.
  Reply With Quote

Reply


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
8 GB150D amplifier modules and 4 GB150S2 power supplies from ska-audio.com Didush Swap Meet 0 1st August 2009 09:06 PM
LM3886 Chip Amplifier Stereo PC Boards, Kits, and Assembled & Tested Modules Jackson Audio Vendor's Bazaar 2 8th April 2007 12:17 AM
Audio amplifier project kits syber Chip Amps 2 6th December 2006 07:42 PM


New To Site? Need Help?

All times are GMT. The time now is 09:53 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