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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th April 2012, 06:15 AM   #2261
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27V DC will be the best solution. Also keep in mind that these boards have a very high failure rate , so don't invest much money on it. I had one dead on arrival, the 2nd had problems with the temperature control & the 3rd worked about 3 months (with mods) and now makes a loud noise when power on & becomes stable after 2 seconds. Not so reliable. I found that the best solution are the amps hifimediy is selling (T1 & T2 are very reliable & don't need mods). If you build your own PSU that bridge rectifier is ok, just put some 0.1uf mkp's there for high frequency filtering.

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Originally Posted by Nosian View Post
hi guys,
after all readings i'm confused about the psu voltage?! according to Sure 24-30v max 32v. and many other comments here and there. which voltage gives the best sq? not loudness or watt!

i'm trying to build my psu finally. is 26mb60a bridge rectifier a good solution? or any better?

Last edited by vmed_cha_gr; 10th April 2012 at 06:22 AM.
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Old 10th April 2012, 06:22 AM   #2262
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I also had 3 boards, all dead!!! It is not that I hate Sure, as they replaced 2 of them, but just a warning.
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Old 11th April 2012, 01:13 AM   #2263
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Hmmm.... Sounds like the Sure 7498 boards may still not be ready for prime time. Too bad...this chipset, if properly filtered at the output, provides somewhat more power than the TK2050 version, and can be run at up to 32V DC power supply. However, the open question is...is the sound from the 7498 into good speakers as unusually good as the results from the Tripath boards?

Rumor has it that the new high power boards using the IR dual supply chipset and the TI high power chipset offer better sound quality than the older ICEPOWER and Crown Class D designs. As noted in some of the posts above, however, small changes in the output low pass filters and input coupling can make a very large difference in sound quality (and actual, measured results, too, I have read elsewhere). Regardless, I can state that the 2 channel and 4 channel Sure TK2050 boards produce very good results into high quality transducers, though perhaps a touch less good than some of the low power Tripath chip designs. In other words, yes, if you pay peanuts, often the results are monkey business, but there are a few (laboratory grown) diamonds in the mix, too.
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Old 11th April 2012, 06:20 AM   #2264
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I am right now listening to a pair of AMP11 boards of 41hz that have been ON non stop since 2007!! I have had the AMP32 in my car PERMANENTLY on live (also at starting the car!) for two years and that amp is now doing a job as test amplifier at my workbench. These amps when well built and handled are rugged as can be!! Oh and the AMP11 are running on 35Vdc!

I can only say if you want to have a completed amp then buy either the Hifimediy boards, or get something from Arjen Helder. The latter are fairly good designs, only some cheaper (though adequate) components as the other. 41hz parts are still superior to all though....
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 11th April 2012, 07:21 AM   #2265
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Appareantly, those first boards are of better quality. Mk1 of my friend still works fine.
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Old 11th April 2012, 07:48 AM   #2266
v-bro is offline v-bro  Netherlands
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I guess the expression haste makes waste is applicable here then. The smell of money probably made them cut some corners short...
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Old 11th April 2012, 05:42 PM   #2267
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thanks vmed_cha_gr I have very little knowledge in electronic. just of curiosity wonder why 27v? would you develop it please.
best regards
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Old 11th April 2012, 06:34 PM   #2268
v-bro is offline v-bro  Netherlands
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That has been repeatedly reported to be the point where the temperature of these boards is still acceptable, above that you need a nuclear power plant water cooling system to keep it down enough.

The beauty of switchmode circuits should be efficiency....(scratch on head)
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Old 15th April 2012, 04:21 PM   #2269
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At idle the Kill-a-watt says it draws 9w from the wall. With Barry White playing nice and loud it's still drawing 9w from the wall. The amp is very efficient. The 20,600uF I added appears to be buffering the peaks quite a bit. I suspect most of the 9w is going off as heat, but considerably cooler than a regular class AB.

The board is definitely not an optimized layout. Jan at 41hz paid careful attention to keep the traces short and strategically put capacitance in place to address oscillation. The amp6 is a good example where small capacitors are placed right on the pins from the Tripath chip.

The Sure Electronics is nice to look at, but I'm guessing nobody ever put a oscilloscope on it. The R&D was skipped. ...but it is super cheap.
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Old 15th April 2012, 06:16 PM   #2270
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Yes it is, thats why are bought three of them, all of them are dead now ;(

Testing should be better done as well as R&D.
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