Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

TPA3250 somebody is listening?
TPA3250 somebody is listening?
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 15th March 2019, 04:02 PM   #901
forestsgump is offline forestsgump
diyAudio Member
 
Join Date: Dec 2017
Quote:
Originally Posted by chermann View Post
Hi Forestsgump

Sorry to read that you are still have this pop on/off problem. as i learned at the TPA3255 YJ board ....... tps3802_supply voltage supervisors "ARK" chip :

there is a chip inside of the FX502Spro to manage this on off behaivour...check maybe the datsheet which values you should have.

chris

Thk Chris for the hint, though I looked hard on FX502Spro board dint find such a chip like "ARK".

These are the list of semiconductors:
Op amp (TI NE5532P)
ST S003F3P6 8bit MCU
IRF9530N
LM2596HVS
AMS1117
LM317M
& ofcourse TPA3250

Any picture to show this chip location?

Last edited by forestsgump; 15th March 2019 at 04:06 PM.
  Reply With Quote
Old 15th March 2019, 05:40 PM   #902
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
Hi forestsgump


datasheet the figure 22 - its the pin config of the tpa3251 !! it is wrong..i wrote this pages before


look at the picture attached..in the datahseeet is written that the RESET pin5 can be forced with a analoge circuit or a microcontroller...so the ST S003F3P6 8bit MCU is right here..



so...the only problem is that we have to check which pin of the C set the pin5 of the tpa3250..and check the datasheet for the "time constant" to do this right...but sorry i lost at the moment with this C


chris
Attached Images
File Type: jpg TPA3250 Reset PIN5 with microcontroller.JPG (23.0 KB, 403 views)
  Reply With Quote
Old 15th March 2019, 05:55 PM   #903
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
i looked at a pic of my pcb layout on the upper side (white baord)
if you follow the traces tpa3250 pin it looks like that it goes to C55.


because you report from the beginning that you had this pop on/off noise maybe check this region....... what do you have there...resoldering?


chris
Attached Images
File Type: jpg TPA3250_V5_white_Layout_1.jpg (435.3 KB, 374 views)
  Reply With Quote
Old 22nd March 2019, 11:13 AM   #904
mixMZ is offline mixMZ  United Kingdom
diyAudio Member
 
Join Date: Oct 2013
found this page that includes some mods done to this amp:

ヤフオク! - NFJ & FX-AUDIO FX502Spro改造品 FX502J-Sの海...

translate says:

Quote:
Parts Changes

, electrolytic capacitor
Date Kemi KZE 35V 330UF → Manufacturer Nichicon Product Category KW 35V 470UF
Manufacturer Nichicon Product Category PW 35V 100UF X 3 → day Kemi KZH 35V 100UF X 3
ELNA 85 degrees goods 25V 10UF X 4 → ELNA RF0 (PureCap) 50V 10UF X 4

-cup coupling capacitors
ELNA 85 article 50v 2.2uF x 2 → ERO MKT1813 (axial type metallized polyester) 2.2uF x 2

LPF
Arcotronics 1.0UF x 4 → ERO MKC1860 (axial type metallized polycarbonate) 0.68UF x 4

op
NE5532 x 2 → JRC2114DD x 2

polycarbonate film capacitor is also HP of certain parts shop
but polycarbonate for the "sound quality is proud of the quality of history on the highest peak of the capacitor (especially of ERO KC, MKC), since all manufacturers cost does not fit unfortunately has been marked will we, "said discontinued.

It is subjectivity to the last, but the amount of information over the whole area by having been subjected to the remodeling was increased.
About one week after the remodeling using, I think when I was finished even aging.

Please think about a bonus because the AC adapter that comes with the quality is not stable bad.
I have wadia 151 power dac in my system (diy speakers with beyma 12g40 , 3" dome mid from tang band and amt mundorf tweeter) and just received this amp (fx502spro) and matched it with dac from khadas - tone board (es9038q2m).

After some listening time all i can say it does sound somehow different to my wadia.

Wadia seems to be better in lower freq. bass is more solid and punctual but everything else sound more thin... (please note I also compared wadia to ad18 and to me wadia was also cleaner ,and better choice overall) highs are as well slightly more exposed and wadia seems to be quieter - cleaner...

fx502spro with khadas sounds more boomy at lower freg (dirty, not as controlled) but mids are fuller, the whole sound is more tube like with deeper soundstage where wadia is more direct ,plain cleaner but without this "magic".

I will try to swap some opamps and see how this will change the signature.
  Reply With Quote
Old 23rd March 2019, 09:19 AM   #905
alexttt71 is offline alexttt71
diyAudio Member
 
Join Date: Oct 2017
Someone noticed that the phasing of the acoustic output is confused. speakers play inside (antiphase). fx502spro.
  Reply With Quote
Old 23rd March 2019, 06:31 PM   #906
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by alexttt71 View Post
Someone noticed that the phasing of the acoustic output is confused. speakers play inside (antiphase). fx502spro.



no ..cant confirm this....
my both amps are well soldered
the plus is red marked
minus is black marked


for both channels L+R


chris
  Reply With Quote
Old 24th March 2019, 03:02 AM   #907
meq123 is offline meq123
diyAudio Member
 
Join Date: May 2018
Quote:
Originally Posted by meq123 View Post
I don't have that PSU (yet), but I see that the B1304 case (commonly available on eBay/Aliexpress) should be just big enough to fit, [...]

UPDATE: Actually, I just measured a clip-in IEC socket, and if you're VERY carefull, and orient it vertically, you might be able to fit in the case it alongside the PSU. But then your 24V socket would have to be mounted directly above the supply's screw terminals. Tight. Very tight.
OK, here's my update to close the loop on using the B1304 case to mount the Meanwell LRS-150-24 PSU. I went ahead and ordered the power supply and spent a couple of hours (plus) cutting and drilling my B1304 to mount it in. I discovered that it IS possible to add a clip-in type IEC socket, but you have to remove the perforated top shield to give clearance to do so. (Note: a screw-mount type with 'ears' is too wide to fit, either vertically or horizontally.) However, given this is a solid aluminum box, the loss of the shield is no big deal. You'll also see that I added a panel-mount fuse holder, but you could use an inline holder, or even omit a fuse entirely (on your head be it).

The worst part of the mechanical work is mounting the power supply. There are few decent mounting holes, and two of them are blind threaded holes, requiring careful measurements and drilling to align everything correctly. OK the other worst part was cutting the hole for the IEC socket. Turns out the rear end-plate of the case I had was much thicker than I usually see on such cases. So it took quite a while to drill rows of holes and dremel and hand-file the square hole to fit the IEC clip socket (first pic - in progress).

I've included pics after the parts are all test mounted (prior to wiring). With 20-20 hindsight, I'd have put the DC socket way over to the other side, above the voltage adjust pot. But too late now.

To save you having to re-invent the wheel , one of the pics shows the hole positions/measurements (to hole centers) for the blind holes to mount the PSU. Obviously you should first verify these hole positions with your PSU, in case they are different. The 3rd hole (marked "X") I just marked from the top and drilled, after test-mounting the supply with the other two screws.

Although I just removed the shield, actually, you could keep it... but you'd have to cut out a piece in the corner, to fit around the IEC (see the red dotted lines in the last pic).

All in all, I really like the end result. Very nice looking case and absolutely the smallest possible - and neatest - package to fit around that PSU.
Attached Images
File Type: jpg Cutting.jpg (104.6 KB, 258 views)
File Type: jpg Mount1.jpg (177.0 KB, 258 views)
File Type: jpg Mount2.jpg (131.3 KB, 257 views)
File Type: jpg Mount3.jpg (114.5 KB, 99 views)
File Type: jpg Holes3.jpg (103.7 KB, 92 views)
File Type: jpg TrimShield.jpg (156.0 KB, 74 views)
  Reply With Quote
Old 24th March 2019, 07:24 AM   #908
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
tight..tighter...tightest
vey well done! i like your power button


chris
  Reply With Quote
Old 24th March 2019, 01:43 PM   #909
meq123 is offline meq123
diyAudio Member
 
Join Date: May 2018
So I was checking the output from the LRS-150-24 power supply this morning. The adjustment pot can alter the output voltage in the range 20V to 30V (no load). Has anybody cranked this sucker up to 30V and tried it? That would give enough headroom to obviate the need to change that resistor on the 24V regulator in the FX502. Plus maybe a few more watts?


Not sure if cranking it up would harm or degrade anything in the power supply - or maybe cause more supply noise.
  Reply With Quote
Old 24th March 2019, 03:17 PM   #910
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
i did some test and try to get the max current out of the psu....i cant find the thread

....but i set to 28,xV to get the max power at 4R it was about 6,5A.


chris
  Reply With Quote

Reply


TPA3250 somebody is listening?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
MPA 3250 Amp johnmik Solid State 18 8th May 2019 05:32 PM
RD Audio 3250.1 Deadly Sones Car Audio 1 10th July 2013 05:51 PM
RD Audio 3250 V2 S Merlington Car Audio 3 28th February 2013 05:55 PM
What are you listening to? MikeW Pass Labs 36 20th June 2011 01:54 AM
Denon DOA-3250 mike49504 Car Audio 2 12th November 2010 08:17 PM


New To Site? Need Help?

All times are GMT. The time now is 11:19 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki