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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th July 2010, 06:27 AM   #531
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Quote:
Originally Posted by zog666 View Post
Thanks, yes I think it will power it well! Just I havent noted anyone else doing it, still will be fun to try.

I am getting the v2 which from the pictures has a single 50V 4700uF capacitor.. my target amp enclosure already has 2 35v volt 10,000uF caps in it.
As a possible future "easy" upgrade can put them in series to make a 70v 5,000 uF cap which I can wire in parallel with the onboard cap, doubling the capacitance.
Why not use 20000uF?
35V is enough for your usage.
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Old 26th July 2010, 03:04 PM   #532
zog666 is offline zog666  Australia
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Quote:
Originally Posted by hifimediy View Post
Why not use 20000uF?
35V is enough for your usage.
ok, you've persuaded me! got my tracking number so it's on its way.. though as I just wrecked another amp I'll lay off the mods for a while until I get a feel for it running stock.

Last edited by zog666; 26th July 2010 at 03:06 PM.
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Old 26th July 2010, 03:34 PM   #533
sendler is offline sendler  United States
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Default 50v feeback resistor values

I just realized something about using the 517b chips, in our quest for 50v and it's increased power, what do we do with the gain settings of the feedback loop? If we use a 15v/v setting that we have been using at 30v, will we clip the feedback input of the TC2000 causing distortion and reliability issues?
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Old 27th July 2010, 10:24 AM   #534
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Sorry if this has been asked before, but the recommendation of the 2*80W board for speakers of 8ohms is based on power available or sound quality?
BTW: I would like to power 16ohm horn drivers with it, so which will be the right choice?
Thx in advance for feedback.
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Old 27th July 2010, 10:36 AM   #535
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Quote:
Originally Posted by sendler View Post
I just realized something about using the 517b chips, in our quest for 50v and it's increased power, what do we do with the gain settings of the feedback loop? If we use a 15v/v setting that we have been using at 30v, will we clip the feedback input of the TC2000 causing distortion and reliability issues?
Hi, sendler. Good question.
For T3, the gain is larger than other boards to achive larger voltage output range. And for reliability, we are doing more test now.
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Old 27th July 2010, 11:02 AM   #536
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Quote:
Originally Posted by dubai2000 View Post
Sorry if this has been asked before, but the recommendation of the 2*80W board for speakers of 8ohms is based on power available or sound quality?
BTW: I would like to power 16ohm horn drivers with it, so which will be the right choice?
Thx in advance for feedback.
Hi dubai2000,
2*80W@8ohm is the maxium output ability of the board(v1 and v2), based on power available as you said. If drive 16ohm loader, v1 and v2 will output less power(about 40W max). So may be T3 is better for you.
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Old 27th July 2010, 01:44 PM   #537
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Going active power is no real issue.....I am looking for a board that sounds as warm and full as my modded 3020amp but without its hiss. Would your amps be less 'noisy'....talking about more than 100db speakers?
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Old 27th July 2010, 01:47 PM   #538
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Quote:
Originally Posted by dubai2000 View Post
Going active power is no real issue.....I am looking for a board that sounds as warm and full as my modded 3020amp but without its hiss. Would your amps be less 'noisy'....talking about more than 100db speakers?
I would recommend the v1 ALPS for you. i have 99db speakers, and no noise. with ear 10 cm from speakers then i can hear some sshhh very quiet. Same with v2, but, on my speakers the v1 alps is slight better than the v2.

Last edited by Nick122147; 27th July 2010 at 01:50 PM.
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Old 27th July 2010, 06:14 PM   #539
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Thanks, Nick, for your feedback. Is the v1 the same as v1.1b.....getting a bit lost with all those versionon your ebay page .
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Old 27th July 2010, 06:59 PM   #540
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Hi, yes i can see that it's only a short for v1.1b. There are only two main versions now, v1.1B and v2.0B. V1.1B comes with either alps or ctr pot.
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