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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st July 2005, 12:16 AM   #11
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I agree, but you may want to be careful using a switching supply with a switching amplifier.. I'm not sure how much of the switching supply noise will go through the amp, and other's (in other forums) have reported deleterious effects when using the two together.
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Old 21st July 2005, 12:30 AM   #12
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I have another question for you. I want to put the power supply in a separate box and run a cable to the male IEC connector of the amp. I would like to know if there is a maximum length I can use before I get some bad effect on the sound ?

Also, I read somewhere that switching supply should not be used with T-amp....and other pretend that their amp sound better using it
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Old 21st July 2005, 02:09 AM   #13
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I've powered one of my T-amps off my PC's switching power supply with no noticeable ill effects. I guess it all depends on the quality of the supply.

I'll post how my new power supply works out once it arrives.
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Old 21st July 2005, 03:18 PM   #14
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Originally posted by theAnonymous1

I'll post how my new power supply works out once it arrives.
Please do it !

I'm sure that it will be very helpfull for many of us.

regards,
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Old 22nd July 2005, 07:40 AM   #15
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Originally posted by motherone


With 12.5A, you could make a fully biamped 6 channel HT system! Are you going to be tri-amping some speakers?

Well, bi-amping the fronts and using an single amp for the full range rears. I don't think I can run dipole subs off a t-amp sadly. I'd probably have to get one of those higher powered 41hz kits, but I strongly dislike working with SMDs.
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Old 22nd July 2005, 10:18 AM   #16
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Quote:
Originally posted by kanaddict
I have another question for you. I want to put the power supply in a separate box and run a cable to the male IEC connector of the amp. I would like to know if there is a maximum length I can use before I get some bad effect on the sound ?

Also, I read somewhere that switching supply should not be used with T-amp....and other pretend that their amp sound better using it

Add something like 470uF + .47uF at entrance on the amp and it probably won't matter.

The problem with switching amps is that both the T-amp and the PSU are switching, so you may run into harmonic interference/overtones with a switching PSU on the T-amp. With the current draw being so low on the T-amp, a 1.5 amp linear PSU with a LM317 regulator should work fine. If you're concerned about current draw, go with a LM338 or one of the LT1085 variants.
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Old 22nd July 2005, 03:01 PM   #17
tmuikku is offline tmuikku  Finland
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Hi all,

I'm about to build a light weight bassguitar power amp. Do you fellas think that Tracopower TIS series industrial powersuplies are suitable for audio use(t-amp)? I don't know pretty much anything about those parameters like EMI suppression, Ripple and noise, Line & Load regulation...

I'm planning to buy AMP2 kit from www.41hz.com because it seems to be the most suitable for my use. I'd like to use switchingmode ps because of its light weight. Desired output could be (RMS) 2x200W/8ohm or 1x400W/8ohm or more bridged.

Thanks in advance!
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Old 22nd July 2005, 06:29 PM   #18
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I with you there - a light weight bass amp would be fabulous.

I've been thinking about these:
http://cadaudio.dk/pwmaudio_en.htm

A PWM amp already paired with an appropriate SMPS
No suprises like you may get with trying to pair your own.

I've also been eyeing the 41hz Amp4 for a portable battery powered, practice and acoustic jamming head.
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Old 23rd July 2005, 11:33 PM   #19
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I'd have to agree there is no point to a higher amperage switching supply. Even a very low part count LM7812 is MUCH cleaner than even a good switcher. Switchers are only used for higher current applications to cut costs, avoid a large transformer, weight, and efficiency. These factors do not apply with a mere ~ 1A need for SI plus an amp margin. These amps happen to have good PSRR so you can get away with using a switcher while you wouldn't in some other amps, but there's still no good reason to do it for powering a single SI.

If you're trying to put together an entire HT out of several, you're facing a different scenario, needing more amps. I'd still go with a linear but it would make a switcher seem more reasonable.

So to answer the OP, "is this a good supply?". No it's got nothing in particular making it any better than (any other choice). It'll work, but the qualities that distinguish it are actually negative things.
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Old 24th July 2005, 12:58 AM   #20
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Originally posted by !

So to answer the OP, "is this a good supply?". No it's got nothing in particular making it any better than (any other choice). It'll work, but the qualities that distinguish it are actually negative things.
Well, it's to late as there is two of them on the road to my home. I'll try them & compare them to another 1.5A supply I have and will repport the results...good or bad !

Thanks,

Daniel
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