My_Ref Fremen Edition - Beta build/Fine tuning - Page 102 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th June 2012, 04:14 PM   #1011
squalor is offline squalor  United States
diyAudio Member
 
squalor's Avatar
 
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.
  Reply With Quote
Old 17th June 2012, 04:25 PM   #1012
bcmbob is offline bcmbob  United States
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."
  Reply With Quote
Old 17th June 2012, 04:46 PM   #1013
romvise is offline romvise  Italy
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
  Reply With Quote
Old 17th June 2012, 05:45 PM   #1014
bcmbob is offline bcmbob  United States
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
File Type: jpg Amtrans.jpg (105.3 KB, 194 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 17th June 2012, 05:49 PM   #1015
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
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 05:53 PM.
  Reply With Quote
Old 17th June 2012, 05:51 PM   #1016
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Understood - Thanks.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 17th June 2012, 06:44 PM   #1017
bcmbob is offline bcmbob  United States
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
File Type: jpg AM01.jpg (156.5 KB, 186 views)
File Type: jpg AM02.jpg (127.2 KB, 180 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 17th June 2012, 07:54 PM   #1018
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by bcmbob View Post
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"
  Reply With Quote
Old 17th June 2012, 08:57 PM   #1019
bcmbob is offline bcmbob  United States
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."
  Reply With Quote
Old 17th June 2012, 09:01 PM   #1020
bcmbob is offline bcmbob  United States
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."
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My_Ref Fremen Edition - need help on PCB evaluation ClaveFremen Chip Amps 450 23rd October 2013 04:38 PM
fine tuning of tapered TL...can i do this??? mondogenerator Multi-Way 6 8th December 2009 06:05 PM
F3 fine tuning ZUM911 Pass Labs 5 31st January 2008 10:14 PM
Orion fine tuning PT914 Multi-Way 6 14th February 2005 10:11 PM


New To Site? Need Help?

All times are GMT. The time now is 02:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2