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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 4th April 2014, 04:59 PM   #51
tamazi is offline tamazi
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Default Some photos

Some of enclosure photos for 50asx2. sorry for bad quality
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File Type: jpg IMG-20140404-00014.jpg (138.7 KB, 1251 views)
File Type: jpg IMG-20140404-00017.jpg (394.6 KB, 1207 views)
File Type: jpg IMG-20140404-00015.jpg (137.3 KB, 1152 views)
File Type: jpg IMG-20140404-00019.jpg (838.5 KB, 1177 views)

Last edited by tamazi; 4th April 2014 at 05:01 PM.
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Old 28th May 2014, 04:56 PM   #52
freefuzz is offline freefuzz  United States
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i've got 6 of these here, 3 btl and 3 ICE power 50ASX2 SE's, built into 3 k array piccolos (sub, 2 sats). i see that these modules have hf protection circuits, but when i measure the output with my scope with a sine at the input, i get a heck of a wide sine on the output.. it looks like there's a lot of hf on there, though i can't hear distortion on the speakers. has anyone else had this problem? i have it on every single module!
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Old 28th May 2014, 08:24 PM   #53
Nisbeth is offline Nisbeth  Denmark
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ICEpower 50asx2 modules
I believe that unless you use a (AES-17) measurement filter to limit bandwidth, you'll see carrier frequency residue on the output, is that it?

/U.
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Old 30th May 2014, 02:41 PM   #54
freefuzz is offline freefuzz  United States
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i was unaware of that, thanks! i brought out some other digital amps and measured them and am quite surprised that this is apparent in all of these..
so what i'd have to do is insert a lpf to single out the actual audible signal the output?
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Old 30th May 2014, 04:11 PM   #55
freefuzz is offline freefuzz  United States
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http://m.eet.com/media/1063435/IRFig9.JPG
that definitely helped. thanks again!
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Old 20th August 2015, 10:09 AM   #56
pguerin is offline pguerin  France
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I've just finished connecting an 50AX2 SE module, ASX buffer and +-12V linear PSU.

Buffer is Nisbeth design using LM49710 OP amp :

https://theslowdiyer.wordpress.com/2...r-asx-modules/

PSU if from diyinhk :

Classic Reference 78xx power supply linear regulator 3.3V 5V +-12V - DIYINHK

Sound is very nice and detailed

Definitly those 50ASX2 modules need an input buffer !

There is no caps at at the input buffer the amp being connected at the output of my Najda DSP.
I will evaluate the sound inpact with caps in few days.
Attached Images
File Type: jpg ASXBufferv11populated.jpg (383.6 KB, 969 views)
File Type: jpg 50ASX2Amp.jpg (368.7 KB, 424 views)

Last edited by pguerin; 20th August 2015 at 10:27 AM.
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Old 22nd August 2015, 07:46 AM   #57
pguerin is offline pguerin  France
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See below the schematic and the component values of the buffer.

I was wondering if I must put R5 because as I HAD read that the input impedance of the module is not constant.
I've shorted it on the PCB and sound seems better, less sweet but subjectively more natural.

Any advice concerning this part (R5) ?

Part List
--------------------------------
C1 1uF - 2,2uF -> short
C2 10uF
C3 100nF
C4 100nF
C5 10uF

R1 470R
R2 47k
R3 1k
R4 1K (R4 sets gain G = 1+(R4/R3) -> 2)
R5 47R
D1 1N5296 (0.91mA CRD)
C10A 100pF (1206 SMD)

OUT JST XH or similar PINHD-1X3 1X03 PIN HEADER
PWR JST XH or similar PINHD-1X3 1X03 PIN HEADER
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File Type: png ASXBufferSchematic.png (18.2 KB, 475 views)

Last edited by pguerin; 22nd August 2015 at 08:01 AM.
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Old 13th September 2015, 08:25 AM   #58
pguerin is offline pguerin  France
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The 50ASX2 two channel amp with ASX buffer is finished, ad working nicely
I will add a second 50ASX2 module and buffer in the case in few weeks.

Value used for R5 is 0 Ohms (short)
Value used for C10A on my board is 100pF (1206 SMD)
Some readings recommend a value around 40/50 pF.
The aim of this cap is to prevent OP amp from oscillating cf.

Working with Cranky Op-Amps



Last edited by pguerin; 13th September 2015 at 08:29 AM.
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Old 17th September 2015, 10:12 PM   #59
rnewscates is offline rnewscates  United States
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Default ICEpower 50asx2 Stereo Modules

I built a stereo amp with one of these modules- easy to hook up, study the documentation. I didn't have plugs to fit the on board sockets so I just soldered wires to the back side points on the board. Other than the inputs, outputs and power I think there is only an enable line to hook up. I mounted the module into a gutted small Marantz power amp case- looks nice and I used the input and output jacks. Easy project, sounds very good - I was surprised at how good it sounded. Bob Scates Springfield, VA
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Old 18th September 2015, 06:40 PM   #60
pguerin is offline pguerin  France
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Quote:
Originally Posted by rnewscates View Post
I built a stereo amp with one of these modules- easy to hook up, study the documentation. I didn't have plugs to fit the on board sockets so I just soldered wires to the back side points on the board. Other than the inputs, outputs and power I think there is only an enable line to hook up. I mounted the module into a gutted small Marantz power amp case- looks nice and I used the input and output jacks. Easy project, sounds very good - I was surprised at how good it sounded. Bob Scates Springfield, VA
Hi
you can source the cable at Ghent Audio, I was also surprised how good it sounded
I'm thinking of building a stereo amp with two 50ASX2 BTL modules !
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