What's a chap power supply for the Sonic Impact 5066? - diyAudio
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Old 10th December 2006, 05:21 AM   #1
85Dave is offline 85Dave  United States
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Default What's a chap power supply for the Sonic Impact 5066?

I'm slowly gathering parts for my mods to a Sonic Impact 5066

My orders are going to Radio shack, and Parts express. Total is about $53 including the amp.

My goal is to replace the input, outputs, POT, add switch, new power supply, and a new plastic case for it all.

I'm just wondering what power supply will work with this amp.
I have heard I can't go above 13Vdc and so I won't. Normally I see more output on the power supplies than whats rated on them..as much as a 3V increase.

I'll be putting a heat sink on the main chip to keep it cool so hopefully I won't have any heat problems.

This project doesn't have to look too good, just work well. I do Lot's of audio recording and video editing so I'll need a good amp

As soon as I get the power supply for this I can make my orders and get building.

Thanks for the help
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Old 11th December 2006, 01:26 PM   #2
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The switching power supplies sold for LCD monitors seem to work well. 12V versions are available. There's a 4 amp one one eBay for $8.49. Browse thru Computers>Monitors>Accessories>Other, then search for "12v."

With some of these you might need to change the power plug to fit the jack on the SI, because they don't all match.

Somewhat higher voltages can be used, and people seem to feel it gives the amps a little more punch. I'm running my SI at 13.2v, and a 13.8v regulated supply was fine, but an LCD monitor SMPS at 14.1v definitely overheated the chip, even w/ a heat sink.

--Buckapound
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Old 11th December 2006, 02:13 PM   #3
pjanda1 is offline pjanda1  United States
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Is there a downside to the SMPS's other than a potential plug mismatch? They're cheaper than most appropriate wallworts, and sure much easier to plug into an outlet strip.

Paul
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Old 11th December 2006, 02:22 PM   #4
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A lot of people on these forums feel that a good SMPS is the best power supply for the Tripath chips generally.

The LCD monitor supplies seem to be of a generally high enough quality to work well in this application.

No downside as far as I can tell.

--Buckapound
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Old 11th December 2006, 09:50 PM   #5
Pano is offline Pano  United States
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Places like All Electronics or BG Micro often have SMPS for cheap. I have found some great deals there that worked well with T-AMPs.
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Old 11th December 2006, 10:33 PM   #6
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I also am preparing the way forward into SonicFrontiers modding territory. Mine just arrived last monday. It came, very cold, off the porch and hooked up to a 1 amp wall wart (what I had on hand) and sounded terrible. After about 15-20 hrs runtime on the 12V/1A supply it started to sound listenable. Now I have found a 12V/5.4A supply, and with the help of the new supply it's starting to sound pretty good. Soon I'll start ordering fancy-pants parts to put on the inside.

I had been thinking initially about this PS:
http://www.partsexpress.com/pe/showd...number=120-536

(there are other PSs here, but they jump up to 13.8v, which I had thought was too high)

But then it was suggested that 2A @ 12V was too little. So next I was looking at this one (12V/5A):
http://www.trcelectronics.com/sunny/...-6012-t2.shtml

But, luckily, I stopped by the local surplus+salvage store here in Minneapolis (Ax Man - http://www.ax-man.com/) and was able to find a 12V/5.4A supply for $11. Had to spend more than the cost of the actual supply ($14) to get a tip to solder onto the power lead of the supply and get it into the T-Amp. The unit looks like it could be similar to the LCD power supply type jobbie, but I have no way of knowing what it actually came from. It helped out with the low frequency and the level of detail and dynamics across the spectrum, tho.

I had been wondering how much current was required. Someone suggested 2 was ok, but go 3-5 if you can. Thinking about it, I did a little math. Anyone care to dblcheck me?

The t-amp is 80% efficient. I think I read this somewhere, but don't recall the source. I might be wrong.

The t-amp claims 15w x2 output. This is at some super high distortion figure, but it was explained somewhere else that this is how much power the unit is capable of putting out total theoretical max, and the distortion figure wasn't even thought of in the generation of this number.

So 80% of input power gives us 30 watts output(total). The input power then is 37.5w.

Volts * Amps = Watts so 37.5 w / 12 v = 3.125 amps. This is assuming that you stick with 12v to run the thing. Unless I am wrong (not unusual) that is how much current the thing can use, any more would be excess. ... I think.

- A
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Old 11th December 2006, 10:45 PM   #7
Pano is offline Pano  United States
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For most musical use the amp will be drawing 250~350mA, tops.

I have not seen a probelm with 3 amp supplies on 8 ohm loads, running full blast. 2 amp supplies seem to cope well, too.

As always, there is some voltage sag on loud signals. That's why big tank caps help the dynamics and bass.
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Old 11th December 2006, 11:31 PM   #8
85Dave is offline 85Dave  United States
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thanks for the tips on the LCD power supplies guys

I found a wall plug for $15 at mouser and i'm going to be ordering from them anyways so it should work just fine....just needs a new cable end
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