| sled108 |
Has anyone heard anything about this.... MPS7722...
2 X 20w @4 ohm w/ 9-24v.
http://products.monolithicpower.com...ng.do?evalId=51
Fedex is driving me one across the country, but the Spec. Sheets look promising. If you'd like to see them, you can get them at AllDataSheet by searching EV7722DF-00C......
It's such fun....$4 Eval. Board.... Plus $14 Shipping, Handling & Tax for 7 day delivery.... An Amp6 Basic cost $7 S&H in 4 days from Sweden! |
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| raintalk |
:bigeyes:
I think they missed a decimal point on those eval board prices.
(to your advantage) |
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| dweekie |
| Did you order direct from Monolithic? |
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| theAnonymous1 |
| quote: | Originally posted by sled108
Has anyone heard anything about this.... MPS7722...
2 X 20w @4 ohm w/ 9-24v.
http://products.monolithicpower.com...ng.do?evalId=51
Fedex is driving me one across the country, but the Spec. Sheets look promising. If you'd like to see them, you can get them at AllDataSheet by searching EV7722DF-00C......
It's such fun....$4 Eval. Board.... Plus $14 Shipping, Handling & Tax for 7 day delivery.... An Amp6 Basic cost $7 S&H in 4 days from Sweden! |
I hate to be the bearer of bad news, but I'm pretty sure you ordered just the IC.
Did you click the "buy" button on this page for the MP7722?
http://products.monolithicpower.com...o?categoryId=12
If so, it sends you to AVNET to purchase just the IC for $4.07 each. |
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| sled108 |
:hot: You've got to be kidding me.....There goes my weekend....I must of paid $18 for a $4 Chip!! I'll get a whole lot of listening pleasure out of that. And then, they're Ground Fedexing me a microscopic Bug...
I was directed from Monolithic to Avnet, for the last time.
If it's too good to be true...... |
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| sled108 |
Well, here's what I was hoping for....
http://pdf1.alldatasheet.co.kr/data...7722DF-00C.html
But it doesn't seem to be any way to buy the thing..
So much for buying "Locally".....Looks like I'll have to send my $ to China for one of these...On E-buy....
2*15 watt @ 4ohm, TA2024 D-class Audio Amplifier Board
So it goes...... |
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| e_fortier |
Hi,
You can order an eval PCB (Stereo) from SureElectronics2 on e-bay for $7 + $5 shipping. They use the MP7720 which is according to MPS a 20W@4ohm (10% THD)
See here; http://cgi.ebay.com/2-8W-8ohm-4ohm-...1742.m153.l1262
The SureElectronics says 8W at 4 or 8 ohm but according to the spec sheet of MP7720 it is more :)
Regards,
Eric |
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| e_fortier |
Hi,
If you want to buy the MPS eval PCB you must call Avnet since these PCB are not listed on their web site but you can surely buy one from them (about $30). I almost did but instead through their local rep I got a 50W/ch stereo eval PCB.
The one I have plays very well.
Eric |
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| theAnonymous1 |
| quote: | Originally posted by e_fortier
The SureElectronics says 8W at 4 or 8 ohm but according to the spec sheet of MP7720 it is more |
It looks like just a little over 10w RMS @ 4 ohm; after that THD shoots almost straight up.
For the SureElectronics board it looks like the best way to use it would be with differential inputs (BTL). That way you could remove the output coupling caps and get a clean 20w RMS @ 8 ohms. You would need two boards for stereo, but they are cheap enough.
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| e_fortier |
For the SureElectronics board it looks like the best way to use it would be with differential inputs (BTL). That way you could remove the output coupling caps and get a clean 20w RMS @ 8 ohms.
That sounds very good, overall size for the 2 PCB would be would be 3.5 inches x 4 inches.
The nice thing about the one I have (50W stereo) is that it's dead quiet, I always found that the SureElectronics had some hiss into them.
I have told them about the hiss issue and hopefully they will report back.
Removing the output cap sounds also very good since the one on the PCB are too small.
Way too many amp to play with, I'm going crazy ! I recently salvaged a power transformer from a Crown CE-2000 (+-85Vdc) and I also found 15 pairs of NOS lateral mosfet 2SK134/2SJ49 TO-3 case. These components with a few LME49830 would be nice but not enough time unfortunately but maybe some day...
Regards,
Eric |
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| sled108 |
| Thanks...I've seen those too...But the basic question remains...How do these MPS Chips sound?? |
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| sled108 |
Well, the 2 X 20 watt amp. bug arrived.....What an Eyeful....
I guess I'll need one of these now......
Now, does anyone know where to get a Dr. Evil Fine-Point Soldering Laser?? |
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| e_fortier |
Hi Sled108,
The eval board you are refering uses the MPS7722 which is identical to MPS7720 except that it is a stereo IC. The mono type (MPS7720) also has slightly less distorsion at 1W.
If you buy the one from Sure-Electronics2 at $7 (+ $5 shipping) it is a stereo PCB using 2 x MPS7720 so basically you will get the same as using 1 x MPS7722.
Building your own will cost you more and we did not talk yet about the PCB layout possible issues. These MPS IC usually runs around 600kHz.
BTW, you can get free sample of output coils at www.coilcraft
These IC do sound very good but I'm not an audiophile ;) how can you go wrong with $12 including shipping versus $30 for the eval PCB from MPS.
My 2 cents.
Eric |
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| sled108 |
| I hope these Jpegs will attach |
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| sled108 |
Here's the bug...
Waiting now for the 2 X 15w ta2024 board from Sure... |
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| Tekko |
| Aint that a standard SO20 package ? If so its fully solderable with a standard soldering station. |
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| sled108 |
| No such luck.....It's a TSSOP20.......1/2 the length as a SOP20... |
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| sled108 |
SO20 or TSSOP20
Here's a way to see the difference.. |
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| sled108 |
Well now, it looks like we might have something interesting to play with here....And, Avnet might them in DIP8...Mmmm
In fact, now I've checked, and they do have 38 in PDIP8....
Wow, go figure...Thru the hole....I can use these with my CMOY components.....While they last.... |
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| theAnonymous1 |
| quote: | Originally posted by sled108
Well now, it looks like we might have something interesting to play with here....And, Avnet might them in DIP8...Mmmm
In fact, now I've checked, and they do have 38 in PDIP8....
Wow, go figure...Thru the hole....I can use these with my CMOY components.....While they last.... |
For the price of two MPS7720 + shipping from AVNET you can have a complete working board from Sure Electronics.....
http://cgi.ebay.com/2-8W-8ohm-4ohm-...1742.m153.l1262 |
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| dweekie |
| I have the Sure boards. They will take a little bit of work to sound good. It is single ended, and a conversion to BTL will take care of the output cap (which kills the sound quality), but it will also convert the board to a mono output. It has a little funny thing at the input where one channel is split into two, each with it's own cap and resistor, but one attaches to both chips at the PIN. I'm going to have to doublecheck this, though, since it was a quick glance through. If you read the 7731 datasheet, you'll get an idea of how this functions and the work needed to get the board to a BTL design. The Monolythic datasheets are some of the easiest datasheets to understand. They read like basic introductory textbooks. The Sure Tripath boards are easier to get started with than the MP7720 boards since it takes less work to get sounding good. Unfortunately, Sure does not supply a schematic for the MP7720 as they do with the Tripath boards. |
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| sled108 |
I've posted a new thread for the MPS7720 Chip
Even Better....Here's the Eval. Board Circuit....
I'll post it there too... |
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| mudihan |
| Could anyone of you post a detailed mod that will make two Sure MPS7720 boards work with BLT? Thanks! |
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| e_fortier |
Hi Dweekie,
I have requested the schematic directly from Sure and they will send it to me, it will probably be in by tomorrow :) I will keep you posted.
Regards,
Eric |
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| dweekie |
| quote: | Originally posted by e_fortier
Hi Dweekie,
I have requested the schematic directly from Sure and they will send it to me, it will probably be in by tomorrow :) I will keep you posted.
Regards,
Eric |
That will be great if you posted it here. Thanks! |
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