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Class D Switching Power Amplifiers and Power D/A conversion

I AM D v200, Fx Audio d802, optimisation and TPA3116
I AM D v200, Fx Audio d802, optimisation and TPA3116
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Old 31st October 2015, 11:08 PM   #41
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Join Date: Sep 2004
Location: Northland, New Zealand
I can also recommend using a Twisted Pear AVCC module for supplying AVDD (pin 9) and AVDD_PWM (pin 50)
Trident

I wonder if I.AM.D could provide a mounting header for the Twisted Pear AVCC module, like on the Twisted Pear Buffalo DAC?

Cheers,
Mike
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Old 31st October 2015, 11:16 PM   #42
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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AVCC 2.1 - module update

Cheers, Mike
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Old 1st November 2015, 05:21 AM   #43
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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AVCC module mounted. Only using one output.

Looks like this would fit nicely across C2 and C14, to make use of the dual outputs to feed AVDD and AVDD_PWM separately. Power from pin 1 of P23.
You have to change the pinout of the AVCC module at one end.

You have to figure out which traces to cut so that only pin 9 and pin 50 are fed from the AVCC module.

Cheers,
Mike
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Old 1st November 2015, 05:34 AM   #44
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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On second thoughts, feeding in across C4 and C15 is the right way to do it.

Looks like you can cut the original supply to C4 by lifting L2.
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Old 1st November 2015, 07:22 AM   #45
2600Hz is offline 2600Hz
Previously known as: MyNaim
 
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Quote:
Originally Posted by mikey_audiogeek View Post
Clock connection photo here:


Attachment 512089

Hi Mike,

Thanks for that but I still have no idea where to plug my new clock, is it on the right side or the left one ?

Sorry to be a pain
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Old 1st November 2015, 07:31 AM   #46
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Quote:
Originally Posted by 2600Hz View Post
Hi Mike,

Thanks for that but I still have no idea where to plug my new clock, is it on the right side or the left one ?

Sorry to be a pain
No problem!

Remove crystal, C9, and C10
Connect clock output to right-hand pad of C9
Connect clock ground to right-hand pad of C10
Connect clock power +ive to power supply

Done!
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Old 2nd November 2015, 12:29 PM   #47
2600Hz is offline 2600Hz
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Join Date: Sep 2009
Hi Mike,

thanks for that, will try when I get back home. Hopefully I didn't fried everything

So if I understand correctly, you powered up separely AVDD et DVDD, analog and digital parts. Did you notice a significant improvement ?


BTW, congrats for the world cup

Cheers

olly
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Old 2nd November 2015, 05:38 PM   #48
globulegl is offline globulegl  France
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Location: Manche
v200 tcxo . i use KDS DSB535SA SMD TCXO

Click the image to open in full size.
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Old 2nd November 2015, 08:12 PM   #49
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Join Date: Sep 2004
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Quote:
Originally Posted by 2600Hz View Post
Hi Mike,

thanks for that, will try when I get back home. Hopefully I didn't fried everything

So if I understand correctly, you powered up separely AVDD et DVDD, analog and digital parts. Did you notice a significant improvement ?


BTW, congrats for the world cup

Cheers

olly
Thanks! Great game.

Well, I managed to fry my amplifier, when I connected the Twisted Pear AVCC module to AVDD and AVDD_PWM separately. Not sure how, maybe I damaged a capacitor or something when I soldered it.

More likely is that I ended up with some oscillation that damaged the AVDD_PWM supply. The amp worked OK at high volumes but cut out at low volumes. Something not right. Tried to put it back to standard and ended up destroying some traces...

So, I can't recommend using the AVCC module at this time. I'll try again with a Twisted Pear Trident regulator set to 3.3V.

Cheers,
Mike
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Old 6th November 2015, 08:10 PM   #50
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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OK les gars, I need your help.

I received my latest V200, and it's different again! So I can't use the I2S connection shown earlier in the thread.

Anyone have the I2S pinout for connector P23? I guess this is where the WiFi module goes.

Connector P23:
P1 = 5V
P2 = GND
P3 = ?
P4 = ?
P5 = ?
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