MyRefC build guide - Page 106 - 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 9th February 2013, 03:13 PM   #1051
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Thanks. Looking forward to comments about this specific value.
__________________


Last edited by Lil Knight; 9th February 2013 at 03:27 PM.
  Reply With Quote
Old 9th February 2013, 03:28 PM   #1052
diyAudio Member
 
Join Date: Sep 2007
Send a message via Yahoo to linuxguru
Quote:
Originally Posted by bcmbob View Post
It is your call, but linuxguru can send you a completed unit. That's what I bought. I'll just say it was a most significant upgrade to the MyRef series prior to Dario's Fremen Edition.
Bob - thanks for the plug. I now also have a fully-discrete LF05 prototype which also works instead of the LM318. I'll send out a pair with your LF03s, which you are welcome to evaluate at your convenience.

The TL071 will work in place of an LM318, with similar stability but worse sonics. The OPA627 and LME49710 are both marginally unstable in a Rev C - compensation changes will be required, and at the minimum C10 may have to be removed.
  Reply With Quote
Old 9th February 2013, 03:36 PM   #1053
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Any info regarding the LF05? Is it a direct replacement for the LM318?
__________________

  Reply With Quote
Old 9th February 2013, 03:48 PM   #1054
diyAudio Member
 
Join Date: Sep 2007
Send a message via Yahoo to linuxguru
Yup, the LF05 is a direct drop-in replacement for the LM318, and the first pair of prototypes work without modification in a Rev E. I will get a few prototypes into local DIYers' hands to ensure that there is no regression before making it generally available - give it 4-8 weeks.
Preliminary audible sonics of the LF05 are comparable to the LF01.
  Reply With Quote
Old 9th February 2013, 04:09 PM   #1055
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Great to hear that, put me on a list for a pair then.

BTW, would this work with the Rev C v1.2 too?
__________________

  Reply With Quote
Old 9th February 2013, 05:14 PM   #1056
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by lil' knight View Post
I've just skimmed the BOMs... What's the correct value for R2? I see 2 different values, 33k and 10k, from 2 different BOMs. Not sure which is the one to go with. I'm using the v1.2 PCB.
Both are correct.

The 33k value comes from LM3886 datasheet and Penasa's original BOM.

TP boards (including v1.2) also spefify the 10K value.

All my BOMs speficy 10K

Such value comes from a Nelson Pass post.
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 9th February 2013, 05:33 PM   #1057
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Thanks for the clarification

Would there be any negative effect if I use larger value for C13, say 6.8uf? I have a lot of 6.8uf Solen caps left from other projects.
__________________

  Reply With Quote
Old 9th February 2013, 05:37 PM   #1058
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by lil' knight View Post
Would there be any negative effect if I use larger value for C13, say 6.8uf? I have a lot of 6.8uf Solen caps left from other projects.
According Penasa the amp work as he intended with values around 1uF, TP boards specify no more than 2.2uF but I suppose it will work with higher values also.

But I suggest you to stay in the 1uF-1.5uF range
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 11th February 2013, 03:01 PM   #1059
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
Thanks, Dario. I'll stick with the 1uf cap then.

Looks like the Omron relay is out of stock now. Would this one work just fine? 833H-1C-C-24VDC Song Chuan | Mouser
__________________

  Reply With Quote
Old 11th February 2013, 05:00 PM   #1060
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by lil' knight View Post
Looks like the Omron relay is out of stock now. Would this one work just fine? 833H-1C-C-24VDC Song Chuan | Mouser
It should but never tried it... or you can buy the non sealed Omron: 653-G5LE-1-DC24
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  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
New guide from TI FastEddy Parts 0 19th August 2007 08:36 PM
Various questions from a diy noob regarding the myrefC. thegeek Chip Amps 8 7th June 2007 04:49 PM
Everything required to assemble MyRefC and Kookabura. Tony D. Swap Meet 3 18th January 2006 02:54 AM
what is a wave guide? Joules Multi-Way 7 12th May 2005 02:25 PM


New To Site? Need Help?

All times are GMT. The time now is 08:43 AM.


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