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Class D Switching Power Amplifiers and Power D/A conversion

ICEpower 50asx2 modules
ICEpower 50asx2 modules
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Old 6th December 2016, 05:59 AM   #91
Rizla is offline Rizla
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Quote:
Originally Posted by Nisbeth View Post
Yes, move the jumper to the BTL-position and then connect the amp as shown in the data sheet (p. 22 in my version).

EDIT: You'll need either a balanced source or a phase splitter** to make this work with an SE source.

**Can be a transformer, a DRV134/THAT1646 type driver as I've used or an opamp-based circuit similar to what is shown in the designer's manual.



Then you wouldn't mind trying with a module or two to see if you can replicate my results, would you?

/U.
I will be using unbalanced rca from Minidsp 2x4hd.

What would be the easiest way to do this, and where does the phase splitter go?
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Old 6th December 2016, 08:26 PM   #92
Rizla is offline Rizla
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Tried to edit the previous message yesterday, unsuccesfully.

Thank you for the answers and your project with making this work.

I will hopefully use 3 of these for Beyma TPL-150H tweeters (LCR) active and 8 pcs to surround and atmos channels in my Home Cinema Setup.
Using 125ASx2 BTL bridged for midrange/midbass drivers active.

So i am reaaaaally hoping for this to work

Thank you in advance

Last edited by Rizla; 6th December 2016 at 08:30 PM.
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Old 12th December 2016, 05:57 PM   #93
Nisbeth is offline Nisbeth  Denmark
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ICEpower 50asx2 modules
And, the results are in

Quote:
So, I’ve done some more testing on my BTL-converted 50ASX-modules…

While I wouldn’t call what I have done “extensive testing” by any means, my gut feeling is that this works.🙂 It also ties in well with how the other ASX-modules work and some “insider knowledge” from years ago that I can still recall🙂

Note and disclaimer: I would very much appreciate if someone else tried this to verify and maybe do more testing, however I will accept no responsibility for damage to property, people or pets (or anything else for that matter) if you find a problem – this is DIY after all😀

You can of course hack this conversion anyway you like, but I opted for removing the old jumper altogether and soldering in a new one. If you do that, be advised that the ASX-board is four layers and soldered with lead-free solder, so it will take a bit more heat to reflow the joints than I am at least used to. If you use a soldering iron that is too small, you’ll just heat up the board and possibly damage it.

Bear in mind that what you end up with isn’t a “real” balanced (= differential) amplifier, but two SE amps referenced to ground and driven with opposite phase input signals to produced a bridged output. As such, the input ground is still required in order for the amp to produce a correct signal on the output.

I’ve found a good sketch here for LM3886 modules that should show the correct input wiring. Output on the ASX is taken from the P104 connector, so ignore what the sketch shows here (and of course the DC wiring is irrelevant as well).

If you do try this, let me know how you get on😀
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Old 12th December 2016, 09:24 PM   #94
Rizla is offline Rizla
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Great, thank you SO much!

So if i dont have a balanced output from my dsp i can use this ?
Unbalanced to balanced Signal Converter Driver Board Buffer input low distortion | eBay

Last edited by Rizla; 12th December 2016 at 09:28 PM.
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Old 8th February 2017, 09:16 AM   #95
InOtIn is offline InOtIn
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Thank you for your work on this!

Quote:
Originally Posted by Nisbeth View Post
Bear in mind that what you end up with isn’t a “real” balanced (= differential) amplifier, but two SE amps referenced to ground and driven with opposite phase input signals to produced a bridged output.
So if this is the case, what's the resulting output power vis-a-vis the BTL? Quadrouple like the BTL (170W) or "just" double (90W)? And is it still good for a 4 ohm load?
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Old 9th February 2017, 06:44 PM   #96
Nisbeth is offline Nisbeth  Denmark
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The power is the same and there is no difference compared to the "real" 50ASXBTL. It's just that the amplifier is dependent on a ground connection on the input side, unlike a "real" differential amplifier.

/U.
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Old 11th February 2017, 08:42 AM   #97
InOtIn is offline InOtIn
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OK great. Out of curiosity, have you tested and verified that your mod actually produces a bridged output and not just crippling one of the stereo channels (i.e. ending up with 1x20W instead of 1x80W into 8R)?
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Old 11th February 2017, 09:08 AM   #98
Nisbeth is offline Nisbeth  Denmark
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In short, no I don't. That's why I've asked for independent verification of my results

However, two things that you should consider here:

- We're not moving jumpers around entirely at random here . The jumper setting is marked on the board and visible on pictures of a "real" BTL board. The BTL wiring on the converted module is done as per the instructions in the data sheet.

- I happen to know for a fact that the original driver behind having two versions of the 50ASX was to be able to cost-optimise the BTL version (by removing parts that weren't required).
Now, I'm not sure that this means there are no other changes between versions, but it does mean I am quite sure as to why the visible parts were removed.

/U.
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Old 27th March 2017, 01:52 PM   #99
marfu is offline marfu  Brazil
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Hi.
Recebo hoje 02 50ASX2 SE .
Vou converter para BTL .
Sera usada em um cubo FENDER RUMBLE 150.

Depois escrevo os resultados.
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Old 27th March 2017, 01:59 PM   #100
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by marfu View Post
Hi.
Recebo hoje 02 50ASX2 SE .
Vou converter para BTL .
Sera usada em um cubo FENDER RUMBLE 150.

Depois escrevo os resultados.


English only please.

Quote:
Hi.
Get today 02 50ASX2.
I'm going to convert to BTL.
Will be used in a cube FENDER RUMBLE 150.

Then write the results.
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