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Old 27th August 2014, 07:10 PM   #1
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Default digital controlled PWM amplifiers

Back when I bought my MiniDSP I thought it was just a matter of months before we had several simple 100 watt TASXXX digital input DIY amplifiers. But where a they?

TI have evap boards, but they are quite expensive.

TAS5612LA | Mid/High-Power Amplifier | Speaker Amplifier and Modulator | Description & parametrics

Do other manufactures have similar aval boards. I just need one digital input, no DSP or other stuff. I have that already.
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Old 28th August 2014, 01:09 PM   #2
luka is offline luka  Slovenia
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what about samples?
I have some similar ones, they might be tas5261.. are you looking for IC or eval boards?
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Old 28th August 2014, 01:50 PM   #3
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I'm looking for a finished PCB just like the countless analogue types that are all over aliexpress and ebay.
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Old 31st August 2014, 07:03 PM   #4
alfsch is offline alfsch  Germany
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well, i want hear direct-digtal...but i found not much about that, especially about > how does it sound ? < -- but seems, nobody knows...or want to tell

so i decided, to try myself...
and made a test: i program pcm -> pwm converter, to see, how good this could be;
was some work on a ARM cpu and with standard test, sine wave, looks not bad;
see att. pic
for this, i want a simple setup first - and looked for "ready" amps, but nothing cheap to find;
next is, to build an amp ...i decided for a test the STAxx chips from STM;
at the moment first layout is almost finished, 100x100mm board...see pic.
it has:
- the digital FFX amp , 2 x20W
- supply reg.
- system controller (ARM F0) for volume (filter etc.), IR-remote , LCD display etc.
- spdif opt + cinch in
- usb in
first i will try without biquad filters and much processing, just volume control...
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File Type: png dd-amp2.png (54.2 KB, 382 views)
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Old 1st September 2014, 09:38 AM   #5
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Looking good. I don't have these skills, so have to rely on ready made boards.
I have heard some different equibit based solutions. Both Lyngdorf, MiniDSP and Panasonic. They all have one thing in common, and that is transparancy. It's simply easier to here details in complex recordings.
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Old 6th September 2014, 06:48 PM   #6
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not much guys :-)

This is the one used in panasonic sa-xr55

TAS5182 | Mid/High-Power Amplifier | Speaker Amplifier and Modulator | Description & parametrics

What is the best sounding chip available today? The above is quite old, but open loop, where the new ones are closed loop.
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Old 7th September 2014, 09:22 AM   #7
alfsch is offline alfsch  Germany
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oh, digital-closed-loop ? which chip does this ?
i found the chips from Ti , STM and Apogee - afaik they all are straight open loop ...

btw
seems, Apogee developed this at first, see
Apogee Technology, Inc.
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Old 7th September 2014, 11:21 AM   #8
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Look at my first post. I also thought it was a contradiction.
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Old 7th September 2014, 11:23 AM   #9
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I guess TACT was first. Appogee sold their technology to STM, and TACT sold theirs to TI
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Old 7th September 2014, 09:27 PM   #10
alfsch is offline alfsch  Germany
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hmmm - so give an old Panasonic sa-xr55 a try - could be a good idea
or not ?
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