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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th June 2010, 12:44 AM   #351
sendler is offline sendler  United States
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Default No Buzzing

Quote:
Originally Posted by TheDealer View Post
that´s also my impression. This board is much more quiet while you hear a present buzzing with the sure board. I call the the sure-sound a bit "toxic", more present and naughty compared to the smoother one from hifimedy. It´s a point of taste and the rest of the chain I think what the better board makes.

When you regard the built in potentiometer and the speaker relay of hifimedy´s board for the same price - it is the better deal
No buzzing in my Sure boards but this is the better deal.
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Old 29th June 2010, 01:03 AM   #352
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Quote:
Originally Posted by sendler View Post
No buzzing in my Sure boards but this is the better deal.
Better deal as far as better value for the buck or just plain better sound in general? I'm looking forward to getting mine any day . . .

For what it's worth, I think the Sure boards sound great, especially with Meanwell power supplies, but I got tired of damaging them when trying to mod those boards. My eyesight can't handle SMD, and I'm just a bit clumsy, not much of a craftsman.

Last edited by soldersmoker; 29th June 2010 at 01:07 AM.
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Old 29th June 2010, 03:12 AM   #353
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Teamacc,

For price info i suggest you find the retail channels, I've been slapped over my fingers already by placing this post, but any technical Questions i'll gladly answer.

maybe it could be fun to open a thread that compares measurements of all boards?

there are many boards out there for the TA2020/2024 now several for the TK2050, listing tests depend on speakers more than amps, and the rest, but measuring power/THD/ bandwidth will tell you the most important things of any amplifier.
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Old 29th June 2010, 03:18 AM   #354
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Location: Jakarta
hi Hifimediy,

thanks for your effort making this very good sounding amp and affordable amp (stereo TK2350 board amp)

I check my amp, the right channel DC offset is only 25mV, but the left channel is 80mVDC. Is there a way to adjust the DC offset on this amp?

what are the two multiturn-pots near the volume pot for?

Regards,
---
David
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Old 29th June 2010, 04:07 AM   #355
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Quote:
Originally Posted by dw1narso View Post
hi Hifimediy,

thanks for your effort making this very good sounding amp and affordable amp (stereo TK2350 board amp)

I check my amp, the right channel DC offset is only 25mV, but the left channel is 80mVDC. Is there a way to adjust the DC offset on this amp?

what are the two multiturn-pots near the volume pot for?

Regards,
---
David
Hi, the blue pots near the volume pot are used for DC offset adjustment.
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Old 29th June 2010, 04:11 AM   #356
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Join Date: Oct 2009
Quote:
Originally Posted by ArjenShenzhen View Post
Teamacc,

For price info i suggest you find the retail channels, I've been slapped over my fingers already by placing this post, but any technical Questions i'll gladly answer.

maybe it could be fun to open a thread that compares measurements of all boards?

there are many boards out there for the TA2020/2024 now several for the TK2050, listing tests depend on speakers more than amps, and the rest, but measuring power/THD/ bandwidth will tell you the most important things of any amplifier.
And for you, I'm giving my best respect for now. but you're not welcome here.
You can leave my thread with your ads.
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Old 29th June 2010, 06:47 AM   #357
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Quote:
Originally Posted by hifimediy View Post
Hi, the blue pots near the volume pot are used for DC offset adjustment.
I see... thanks...
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Old 1st July 2010, 10:41 AM   #358
SOSx is offline SOSx  United Kingdom
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Dear hifimedy,

A quick question? As I have stated I am using your boards for a mobile audio system.
I am looking at batteries for the system.

We would very much like to employ a 24v lifepo4 battery pack due to size and weight.

Most seem to have nominal full charge of 28v-30v which I know from your posts is fine (if not near optimium) but the problem i can see is that the voltage cut off levels are generally between 16&19v.

Also as DC offset is varied according to input voltage, so surely as the batteries voltage lowers with discharge the dc offset will increase?

Will the board still operate safely at 16-19v?

Your thoughts (or anyone else for that matter)

Kind regards
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Old 1st July 2010, 12:26 PM   #359
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Location: Rome, Italy
Another question for hifimediy:
using the same type of capacitors, what I should expect using 2.2uF caps intead of 3.3uF? I read the Tripath datasheet but honestly I didn't understand in which manner the uF value affects the audio signal.
Thanks, bye!!
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Old 1st July 2010, 01:35 PM   #360
SOSx is offline SOSx  United Kingdom
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Another quick question. Does this board require a separate 5v dc power line also?
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