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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th August 2011, 01:25 PM   #2071
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Location: Reykjavík
Quote:
Originally Posted by nrg2009 View Post
I just came back from Iceland! Love the people from Iceland!
I'm glad to hear it
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Old 5th August 2011, 09:46 PM   #2072
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Default Upgraded

Got rid of the diodes and upped the 12v to 27v using one of these;

eBay - The UK's Online Marketplace

And installed an AMD heatsink.

Got quite a punch now, just the same outstanding quality as before. Bliss.
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Old 6th August 2011, 08:00 PM   #2073
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Join Date: Aug 2011
Hi!I want to create my own portable speaker with two 50W 6Ω speakers
Can I use 2 X 50Watt Class D Audio Amplifier Board - TDA7492 with this power supply :
12V 0-3.33A(Set at 3.0A)
And can I connect it to 12V battery?

Sorry for my english
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Old 9th August 2011, 01:46 AM   #2074
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Default Sure 4x100w Tripath boards as a multichannel amp

Hi
I am new to this forum and am hoping someone can assist me.
I am trying to build a 4 stereo zones (8 channel) amplifier using 2 Sure Electronics 4x100 tripath based boards.
When i connect one source to both inputs of one board, it all works fine. But when i connect the source to the other board as well (with its own Meanwell PSU), i get a high pitched sound in all channels.
It seems like some ground loop causing the feedback or the amps are oscillating.
I tried several things - 1) using a single PSU 2) source going to one input on each board 3) tried creating a local ground point connecting the grounds of the two boards and the ground of the input
None of these worked

Attached is a simple diagram of my issue.
Any help will be appreciated

regards
Ravi
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Old 10th August 2011, 08:16 AM   #2075
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Join Date: Apr 2009
Quote:
Originally Posted by rjainny View Post
Hi
I am new to this forum and am hoping someone can assist me.
I am trying to build a 4 stereo zones (8 channel) amplifier using 2 Sure Electronics 4x100 tripath based boards.
When i connect one source to both inputs of one board, it all works fine. But when i connect the source to the other board as well (with its own Meanwell PSU), i get a high pitched sound in all channels.
It seems like some ground loop causing the feedback or the amps are oscillating.
I tried several things - 1) using a single PSU 2) source going to one input on each board 3) tried creating a local ground point connecting the grounds of the two boards and the ground of the input
None of these worked

Attached is a simple diagram of my issue.
Any help will be appreciated

regards
Ravi

I presume you are using the original inputs and haven't bypassed the input stage capacitors?

First try four 2.2uF-3.3uF capacitors inline with the inputs, that should decouple any DC flow.

Good luck, Andrew
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Old 31st August 2011, 04:30 AM   #2076
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Join Date: Sep 2006
Well, I guess this thread is the start for many user, eh? One more!

Hello everyone, I seek advice on modding the 2x100W Sure board. Novice in the modding world by the way.

I plan on run it in a dual mono setup for a car project (found a half-decent look yuangjing 32V PSU - changing caps on that as well).

So for the amp itself, tank caps switch, going for Wurth coils , input mods and decoupling caps. Tips all over the thread, but I guess that's about it.

Since I'll be using 'half' amplifier, I guess it's alright to mod one channel per side - as far input, tank caps e decoupling caps are concerned. No idea on the inductors though. May change 2 or swapping all is mandatory?

Any other recommendations?

Regards,

Raphael
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Old 4th September 2011, 10:13 PM   #2077
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Join Date: Oct 2005
Just finished my new 4 channel (2x amp board) power amplifier. Plan to use a miniDSP 2x4 unbalanced to drive it (nice match: miniDSP output is 0.9Vrms max and Sure amp input sensitivity is 0.77Vrms).

Currently using two channels (one per board) for testing, until I get the miniDSP up and running. Sounds very similar to the Arjen Helder TK2050 I've been using lately. Old amp used Meanwell SP-240-24, new one uses SP-320-24. Added a snubber (0.1uf + 0.22ohm) between common and ground.

Thanks to everyone for the tweaks and tips.
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Old 9th September 2011, 03:33 AM   #2078
Flix is offline Flix  United Kingdom
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Did anyone try to remove the R4 (or R16 on the new PCB's) 0 Ohm resistor between Power Supply GND and signal GND? It should open the loop between GND's. But when I try to start the amp without it the Power ON led is not switching on and the amp is completely dead.
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Old 27th September 2011, 01:12 AM   #2079
tynt is offline tynt  Estonia
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Which is better: two 2x100W-s or one 4x100W? I see many are choosing two 2x100W-s but why?

Last edited by tynt; 27th September 2011 at 01:14 AM.
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Old 3rd November 2011, 08:27 AM   #2080
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Join Date: Nov 2011
after reading almost all the posts here, I just bought my first 2*100 watt from sure electronics
going to drive my passive sub with it. As it is connected using two speaker channels right now, I plan on doing exactly the same thing with the Sure amp.
I am going to use a 24v 10A rated cheap switched mode psu from ebay.
To connect the amp to my AVR I plan on using the LFE out. Can I just connect this to both channels on my Sure Amp?

I am student of electronics engineering, but I have no previous experience working with audio equipment at all.
any tips from you guys?
oh, I live in the netherlands, and am also looking for some kind of case, and maybe some better cooler/heatsink for it. If anyone knows where to get those on the cheap (in the netherlands, or on internet) where I don't pay more shipping costs than the thing is worth?
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