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Class D Switching Power Amplifiers and Power D/A conversion

TPA3250 somebody is listening?
TPA3250 somebody is listening?
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Old 7th February 2019, 11:11 AM   #851
Wiliks is offline Wiliks  Slovakia
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Join Date: Mar 2012
yeah i can use original for now, thats for sure. Just informing what my plans are but still want to improve cooling as at the moment i dont have any heatsink there... still waiting for the bottom piece to attach it to case and I dont want to add the oem heatsink for now with all the thermalpaste and than again dissasembling it etc...

btw chermann did you have the 1mm thick small aluminium extension piece between main heatsink and tpa chip too? without it, my heatsink is in contact with smd capacitors so they had to use it, just i am curious if this is the feature or only my amp got that.
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Old 7th February 2019, 11:35 AM   #852
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by Wiliks View Post
......btw chermann did you have the 1mm thick small aluminium extension piece between main heatsink and tpa chip too? without it, my heatsink is in contact with smd capacitors so they had to use it, just i am curious if this is the feature or only my amp got that.

yes ..the small piece of 1mm alu ....it is normal at my 2 amps..
but you can improve the cooling with alu wahsers instead the nylon once
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Old 8th February 2019, 03:43 AM   #853
jdiego is offline jdiego  Chile
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Join Date: May 2016
Quote:
Originally Posted by chermann View Post
Hi



the Earth connection is done - additionally on case + correct the switch indicator lamp if its power on.
my son (10) helped me once again to build this...
Looks nice, thats a perfect sized enclosure.

Does it work well or the closed chassis is causing the SMPS to heat up?
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Old 8th February 2019, 06:03 AM   #854
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by jdiego View Post
Looks nice, thats a perfect sized enclosure.

Does it work well or the closed chassis is causing the SMPS to heat up?
no heat problem during loud listening in the living room. the power you need does not exceed the max power what the smps can deliver....so no problem that the smps get s in trouble with heat...look at the datsheet of the LRS150-24


chris
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Old 8th February 2019, 02:17 PM   #855
forestsgump is offline forestsgump
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Join Date: Dec 2017
Quote:
Originally Posted by Wiliks View Post
So far I am still waiting for my 32V PSU, damn postage I have a feeling they screwed it again and it got lost
...
Hope you get your 32v PSU soon, pls be aware there will be pop sound when powering off.
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Old 10th February 2019, 11:54 AM   #856
jdiego is offline jdiego  Chile
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Join Date: May 2016
Quote:
Originally Posted by chermann View Post
Hi



the Earth connection is done - additionally on case + correct the switch indicator lamp if its power on.
my son (10) helped me once again to build this...
Couldn't find a cheap aluminum enclosure for the SMPS, so I bought this 10 bucks car safe TPA3250 somebody is listening?

I can't understand why the right ones cost 3 times the SMPS.
Screenshot_2019-02-10-08-36-12-445_com.google.android.keep.jpeg
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Old 11th February 2019, 10:30 AM   #857
aks is offline aks
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Join Date: Jan 2019
Smile guide/summary/list of mods for fx520spro ???

hi guys,
i am a reader for past year and new member ,

i am interested to try this amp , i have ordered it ...now i am rookie at electronics and new to diy , but i think i can do soldering and mods..now

is there a post or guide available for the list of modifications fro fx520spro ??
or can some make a summary ???
is it possible to use opa1612 opamp insteed of lm4562 ???
opa1612 is way better in for noise(1.1nv/root*Hz) and slew rate(27v/us) and thd(0.000015%) anyone used it ???
are there better or similar alternative for opa1612 ??
why use 32v power supply ???
how much improvement in measurement by increasing switching frequency from 450k to 600kHz??
how to increase switching frequency from 450k to 600kHz ??
is it possible to use this with 16ohm speakers ??
anything else i am missing out ???

@chermann,, @ Wiliks and other senior/experienced members please help us out ,

i also would like to thank you diyaudio community and members like chermann for their significant contribution and guidance, i learnt so much by reading this forum about audio
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Old 11th February 2019, 03:00 PM   #858
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Hi aks


welcome to dyiaudio


at page 23 i start a list of modifications..TPA3250 somebody is listening?


.but please read through the pages.


if you are not skilled with soldering then start with changing the opamps. remember the opamps are in the correct housing- not SOIC!
about opamps i canīt help you...i just know that as you change the opamp for the buffer - it can happen that the opamp "ring" in the amp..in my amps not.
the different values in the datasheet says nothing about sound. i changed between 3 opamps and there is a small difference..i think because the orign opamp are fake teh difference is big in SQ


sorry but i still have no THD equipment


450k--> 600kHz...-->Wiliks
you can use 32V ...as i described pages before


this amp is a litte nice sounding amp at the beginning but not as powerfull as an 3E board or Ti EVMboard...if you can live with about 20-30Watts in your listening room then ok.
for 16Ohms speakers ...which one? its needed to keep the voltage about 32V


chris
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Old 12th February 2019, 02:07 PM   #859
Wiliks is offline Wiliks  Slovakia
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Join Date: Mar 2012
cheers, finally local post found my package and i got it!

Click the image to open in full size.

Already tried it and.... wow! what a power, i think it has like twice as much juice as before :-) no measurements yet as I still havent tweaked my cooling solution, will get to it during weekend or so, so will keep you posted with my findings what a power it is capable on 600kHz and 32V PSU :-) I hope it will at least close to datasheet values.
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