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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th March 2010, 08:15 PM   #1111
Nehon is offline Nehon  Italy
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I have received my board just yesterday, it is equipped with a MSI chipset cooler and underneath three are two component marked C935 AG, I believe that are bidirecional transient suppressors, a sort of zener mounted to protect the input.
I don't remember if theese components were assembled in the previus version of this board.
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File Type: jpg components.jpg (666.9 KB, 591 views)
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Old 11th March 2010, 06:19 AM   #1112
mfong is offline mfong  United States
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I think they're diodes. This is the first one I've had, so I never saw the old version of the board. I'd be surprised to find out that they're big capacitors of any kind. I find it interesting that SURE seems to pay attention to this board. They added the fan to the heatsink, then ran the fan at 5 volts. I think both ideas came up in this thread.
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Old 11th March 2010, 07:11 AM   #1113
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I looked back at the early post on this thread and it seems they are some sort of supressor though the numbers are now different, anyhow I will be removing them.

One thing I must say is that Sure are very efficient on the postage end, at least to Aus, I think my board came within 5 working days!

Any updates on output inductors/coils, I am trying to decide which way to go, hedging towards air cores.

What is the run in time on one of these boards, the 2024 boards seemed to need about 30 hrs or so?
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Old 11th March 2010, 11:55 AM   #1114
Nehon is offline Nehon  Italy
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5 working days? Unbelievable, from China to Italy about 25 working days.
Theese suppressors adds a parasitic capacitance to the input, I have not find any datasheets about them so I don't know the right value but I think that the best way is remove them.
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Old 11th March 2010, 05:33 PM   #1115
Abeam is offline Abeam  United States
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Has anyone tried Colicraft's ser1360 series inductors? They look pretty good and I have 6uH and 4.7uH kicking around. I haven't received my amp yet so I don't known if they'll fit. Does anyone have dimensions on the pads on the board?
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Old 11th March 2010, 08:13 PM   #1116
dr_vega is offline dr_vega  United States
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Quote:
Originally Posted by Barbieboy View Post
I would love to know if there are and what benefits is to be had for using a PSU beyond 24v ? I am about to buy my PSU, so will hold off for a bit
The Sure is designed for 32V. Look at previous posts to see why. The difference is slight, but it's what the stock configuration of the board wants.

dr_vega
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Old 14th March 2010, 08:51 AM   #1117
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Default Here is the plan, any comments

I have my first board up and running as a test mule.

So far I have added new input caps (foil) and left the small caps in parallel, removed the other input caps and resistors and those odd devices across the inputs and removed the 2 main diodes on the power input.

The amp is running on 26V battery power using large SLAs.

The sound for the first 5 mins was terrible but it soon smoothed out (funny characteristic that) it is burning in nicely and has 6 hrs or so up and frankly sounds mighty fine even now. It runs very cool, I cannot detect any heat on the heatsink, but then I am certainly not pushing it hard either, currently just of my iPods dock outlet.

At this point I would have to say it is the best bang for buck amp I have ever heard.

I am planning to add air core inductors and lay them down parallel with the board and place them in copper tubing with a good air gap to fully shield them.

I think I might place tank caps right at the chips on the bottom of the board, probably 1000 uf pannys with 2200 uf outboard in place of the current tank caps, I will probably put small tant caps across the 1000 uf caps as well.

Separate 5V supply for the fan from its own reg etc fed by a separate battery, this will feed all the fans as there will be 4 2050 boards plus 2 2024 in total to feed a pair of 6 Driver OBs that I have had running on gainclones for the last 18 months or so.

Largish value cap across the batteries to kill residual noise, I will need to test for the optimum.

Change the resistors needed to match the power supply.

Place a pair of copper clad shield boards above and below the current one earthed to the ground point on the amp board,

So does anyone have further suggestions that are likely to give a real improvement or warnings for my intended pathway.
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Old 14th March 2010, 09:30 AM   #1118
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What about the output caps Zero One ?
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Old 14th March 2010, 09:40 AM   #1119
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Hi Barbieboy, any suggestions on those.
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Old 14th March 2010, 10:23 AM   #1120
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No Zero One, I've changed the input caps like everyone else, but the 'outs' seem to be a bit of a grey area... Have circled in red where they are, not sure if all the components here should be changed though.

Click the image to open in full size.
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