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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th August 2010, 12:06 AM   #31
teamacc is offline teamacc  Netherlands
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Sure, the opamp/source will have the ground connected between the two.
The net ground will complete the other part of the loop.

This because most people connect ground from net with ground from source.
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Old 14th August 2010, 08:31 AM   #32
IvRak is offline IvRak  Denmark
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OK.

So if the two amplifiers share the same supply, and the ground loop only appears, when I connect the signal to the second amplifier, I could possibly iliminate it by cutting the signal ground to the second amplifier, and share the ground in the other signal cable?

Would this work, or even sound good?
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Old 14th August 2010, 08:58 AM   #33
teamacc is offline teamacc  Netherlands
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I think it might disable the hum a bit, but would not sound right.
If the second amp has no ground to reference to but the ground from the net, hum might as well reappear.

Although ive been wondering what would happen if you place twice as big input caps on the board, with that same caps on ground input too. As far as i can see, it let the amp keep the reference to signal ground, but not effectively connect it. (please, correct me if im wrong)

Also, you can try to only ground the chassis of the amp, and not connect the net ground to the amps zero volt line. Make sure that the pot is insulated from the chassis, as it might ground there....
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Old 22nd August 2010, 06:06 PM   #34
juanito is online now juanito  Europe
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Has any body tryed the amp5 from 41Hz??
Do you think there will be much diference between the auspicious.e TA2022 and the amp5 41hz?
thanks! I'm looking also for a ta2022 amp based for my FX120 fullranges.
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Old 10th September 2010, 01:02 PM   #35
IvRak is offline IvRak  Denmark
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teamacc:

Thanks for your suggestions.

The reason I have been slow to reply is that due to an error on my part I fried both amps

I accidentally broke the ground wire suppluing both amps, while they where powered on, and that resulted in two blown up 7912 regultors (loud bang from one of them), and both amps going into protection mode.

New 7812's and 7912's have been installed, and both amps work again.

To make a long story short, I hooked up the two amps with separate supply's, and the humming completely dissapeared. I have both playing right now, and there is absolutely no noise

They actually sound quite good. Not as good as my Hypex UCD400HxR's, but close enough, and at a much lower price.

Now on to building some nice boxes for them to live in
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Old 20th November 2013, 02:03 AM   #36
yjc68 is offline yjc68  China
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It's so beautiful.come on.
Quote:
Originally Posted by authlxl View Post
I found VN10 is so important for this amp,noise always come from here.EB-TA2022 may not attention to this question,this question isn't linear or switch supply,key point is voltage,PCB route also important,I 'm not draw along with TRIPATH EB-TA2022,We haven't ebay shop,if guys have other question pls send mail to me,my mail:authlxl@gmail.com

I have finished the first version, found some question and revised it .the second version will debug next weekend,We believe it will work well at that time.

Fixed specification (tested):

POWER OUT:2100W/4Ω/1%THD+N,285W/4Ω/0.1%THD+N
SENSITIVITY:0dB
INPUT IMPEDANCE:10KΩ
POWER SUPPLY:90-265vac 50 OR 60Hz (T4A FUSE INSIDE)
FREQUENCY RESPONSE:20-20KHz 1dB
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Old 25th July 2014, 12:49 AM   #37
mettel is offline mettel  Netherlands
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why not feed it it after the rectifier with plain dc from a battery
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