My_Ref Fremen Edition - Beta build/Fine tuning
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 Chip Amps Amplifiers based on integrated circuits

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 17th June 2012, 03:14 PM #1011 squalor   diyAudio Member     Join Date: May 2005 Location: Redneck Riviera Hey Bill, I just wanted to thank you for that link you posted, All About Circuits : Free Electric Circuits Textbooks I'm learning a bunch from it, though I do glaze over on the vector math. For anyone new to the hobby, it's a great read. Thanks again.
 17th June 2012, 03:25 PM #1012 bcmbob   diyAudio Member   Join Date: Dec 2009 Location: Bay City, Michigan And this one also. CapSite 2009. Great backgrounder. __________________ Bob M. "Arrange Whatever Pieces Come Your Way."
 17th June 2012, 03:46 PM #1013 romvise   diyAudio Member   Join Date: Jan 2007 Location: Turin Thank you all for the tips, I will solder SMD part for the first time, but with the videos and your explanation, It will be ok
bcmbob
diyAudio Member

Join Date: Dec 2009
Location: Bay City, Michigan
Here's some of that screwy numbering. Parts Conexxion listings (item numbers) don't directly reflect values. Hope I got it right.
Attached Images
 Amtrans.jpg (105.3 KB, 231 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

 17th June 2012, 04:49 PM #1015 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders Not screwy numbering. The first two digits are the value to two sig fig. The third digit is the multplier. 0= add nothing to the first two. 1= add one zero after the two digits, = multiply by 10, 2 = add two zeros after the two digits, = mutliply by 100, 3= three zeros, 5 = five zeros. The J = tolerance. = 10% __________________ regards Andrew T. Last edited by AndrewT; 17th June 2012 at 04:53 PM.
 17th June 2012, 04:51 PM #1016 bcmbob   diyAudio Member   Join Date: Dec 2009 Location: Bay City, Michigan Understood - Thanks. __________________ Bob M. "Arrange Whatever Pieces Come Your Way."
bcmbob
diyAudio Member

Join Date: Dec 2009
Location: Bay City, Michigan
Well that's just fine - With all the long leads I can't play any music, but I can get 12 FM radio stations.

No, actually they sound very good. More clarity, some of the forwardness of the last configuration is lessened. Most noticeable is the reduction of sibilance on the vocal from the test mix.

I'll start the Isotek process and report back in about an hour.
Attached Images
 AM01.jpg (156.5 KB, 223 views) AM02.jpg (127.2 KB, 217 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

ClaveFremen
Reality first!
diyAudio Member

Join Date: May 2005
Location: Milan, Italy
Quote:
 Originally Posted by bcmbob Well that's just fine - With all the long leads I can't play any music, but I can get 12 FM radio stations.
Bob, trim that leads!

7mm will be good.
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch" - My_Ref FE 12th GB is open

 17th June 2012, 07:57 PM #1019 bcmbob   diyAudio Member   Join Date: Dec 2009 Location: Bay City, Michigan Like the song says "You don't know what you got till is't gone". I don't know if there is something called a "Mid and High noise floor", but if there is these Amtrans caps remove it. After the Isotek I discovered, as good as the FEs were performing, there were elements that could have led to listening fatigue. That sounds like coming in through the back door, but that's the impression I'm getting. Again, there is a whole new quality to the presentation that will take some time to appreciate. A one word description would have to be "purity". The cleanliness IMHO, does pull back the warmth (what Dario calls coloration, I believe) just a tad with my speakers, but I think it's a good trade off. I also have a pot on the midrange section of the Sunflower crossovers and can probably pull it back in with some adjustments. The "In the room" presence is excellent. The finale to Copland's Organ Symphony is very complex with a cathedral pipe organ and an augmented orchestra. It sounds glorious. Snare drum rolls come through the blasting brass and the floor shakes on the pedal notes. The front to back stage is one of those things I'll have to investigate further - it might be a bit slimmer but not by much. The general 3D ambiance is totally room filling. Don't know who gets the attribution, but whoever found these gems gets a double gold star. At \$2.50 ea, the Amtrans are almost a no-brainer. __________________ Bob M. "Arrange Whatever Pieces Come Your Way."
 17th June 2012, 08:01 PM #1020 bcmbob   diyAudio Member   Join Date: Dec 2009 Location: Bay City, Michigan Yes Dario, I'm looking forward to getting everything down on the board. I'm still planning to install sockets on the new PCBs. __________________ Bob M. "Arrange Whatever Pieces Come Your Way."

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