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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th October 2007, 02:39 PM   #41
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Join Date: Dec 2006
Default Eagle lbr's

I have read this tread with great interest. There is lying couple TI IC's on the table switch are waiting for to be wired up.
Does anyone have a TI component's done with Eagle? I'd really appreciate if you would share your .lbr with us.
best regards,
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Old 16th October 2007, 04:05 PM   #42
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I'm using ExpressPCB.
(Eagle is too expensive to withdraw)
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Old 27th October 2007, 08:53 PM   #43
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Does anyone want to play with TAS5518 full digital amplifier?
This is my prototype board, and now I'm working with ver.0.2 so it can be passed to you. I think many person have interests in TAS5508/5518 but it's hard to take off. and I need brother in arms.

Board construction:
(1) main digital board, CS8416 - TAS5518 - TAS5121 x 8. accepts I2C control, and generates raw PWM signal.
(2) filter board, large 10uH coils, film capacitors, etc
(3) AVR ATmega128 and LCD, button board. http://microcontrollershop.com/produ...roducts_id=588
(4) Simple variable voltage power supply, using LM317

What you get:
(1) boards, source code, schematics, board layout file (made by www.expresspcb.com software), connector and pins for speaker output.
functions are, volume control with variable voltage, 8 digital input selection, LPF/HPF/EQs/level offsets/mutes. can create 4 way 24dB/oct integrated full-digital channel crossover and amplifier with volume control. Output power is about 20W total.
(2) 10 question support incident

What you need:
You have to be diyaudio member, to send e-mail to me.
AVR programmer / debugger, and of course knowledge of AVR GCC language.
of course you should used to be digital amplifier, diy, wiring, soldering.
Power supply, I was using 18V/3A Lab DC power supply.
diy and at-your-own-risk mind. I used this board to play $4,000 speaker for months, but AT YOUR OWN RISK.

I spent thousands$ until this board works but adequate price will be around $150 including shipping in USA (just to block non-serious person). I hope you already have knowledge about TI full digitals, and interests, also to be serious. Please contact me if you interested in.
(If this post is not appropriate for this thread, please remove > moderators )

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Old 8th November 2007, 04:27 AM   #44
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I ordered Front and Rear panel.

about $90 for Front & rear, including cut / drill / anodize / engrave / white filling.
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Old 10th November 2007, 12:11 PM   #45
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Location: DUS
Hi folks.

I am also looking after a full digital setup. I had a chance to listen
to a full digital chain comprising of TacT digital amps and just
a Linux-PC with an RME card. All DSP work/crossover/roomcorrection
was done with brutefir and acourate filters on the PC.
I never listened to better setup. (Forget 24db filters! )

I am wondering if the whole thing has to be so complex as described in this thread.

I am thinking of let's say a Lynx AES16 running into a PCM/PWM amp.
Just a transparent routing of the respective PCM channel.
The whole DSPing would be done by brutefir on the PC.

Perhaps somebody could tell me how to accomplish what I described above.

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Old 10th November 2007, 04:59 PM   #46
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Hi soundcheck,
Is this "complex"?
major components are CS8416 DAI, TAS5518 PWM generator, and TAS5142 power stage. and AVR MCU.

This project is based on my desire...
(1) I want to use multi way speaker
(2) But I want to minimize components on the route
(3) I'm not so serious about "Phase"
->One TAS5518 can control 4 power stage!

But I prepare future extension for I2S input of TAS5518.
(There are SCLK, MCLK, LRCK and SD01,SD02,SD03,SD04 inputs)
attached. please give me FIR output for 4 way to connect here
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Old 10th November 2007, 06:48 PM   #47
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Location: DUS
Originally posted by KOON3876
Hi soundcheck,
Is this "complex"?
I just reread the posts. I think the basic circuit looks pretty straight forward. I was a bit confused about built in LR filters, microcontrollers

Your approach is pretty much what I am looking for. I'd need 6 channels at 30W. ( I was actually thinking of a 2*3 approach -
this way I could run with AES right into the speakers )

Do you have an idea how this pcm to pwm conversion copes with jitter?
The Tact-Amps I listened to didn't seem to respond to incoming jitter
at all. I have no idea what Tact is doing here to avoid jitter effects.

Regarding filters:
You might have a look here: http://www.acourate.com/ Have a look
at the WhitePaper section. There is IMO no need to have active or passive filters anymore.

I got brutefir running under Linux already. With acourate the filters could be prepared in less than an hour or so. I am just lacking the full digital multichannel amp.

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Old 10th November 2007, 08:55 PM   #48
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With my understanding, TAS5518 does not ASRC but re-samples I2S input by it's clock/PLL/data interface section, by it's owm 13.5MHz clock.
jitter is time sequense fructuation so when re-sampled it's effect goes down some large dB.

For filters, when I make, I will use TI's 6713 DSP kit + DIY expansion board to implement FIR. but the DOC is interesting.
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Old 12th November 2007, 04:15 AM   #49
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Order Made panel is superb for accuracy and beauty, so far away from my handmade

4 way channel divider + Volume control + 4 way full digital amplifier, 2 Toslink + 2 coax input, in 10x9x4 inch box.

Previous version will sit in 19 inch chassi and, 2 system will be convined for 8 way model.
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Old 20th November 2007, 02:03 PM   #50
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TPS40056 Power supply is very compact and easy to control output voltage, but remains small switching noize on power line.
So I want to try Analog discrete power supply.
attached is "positive side only" power amplifier? which creates 4.8V to 19.8V from 0.8V to 3.3V reference voltage input.
including PDF and LTSpice schematic.
comments welcome!
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