Finally, an affordable CD Transport: the Shigaclone story - Page 149 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 24th July 2008, 08:13 PM   #1481
diyAudio Member
 
Erik van Voorst's Avatar
 
Join Date: Mar 2006
Location: Rotterdam
I must say that because of an incorrect electrical -31 scheme it is rather difficult....I received help.

In short it is determining where you pick up the proper trace of the chips.

I think nothing for a newbee....sorry...
__________________
To baldly go where no man has gone before................(James Kirk)
  Reply With Quote
Old 25th July 2008, 08:35 AM   #1482
quan is offline quan  Australia
diyAudio Member
 
Join Date: Feb 2007
Location: sydney
Hi , i just wonder any one else have tried seperate super-reg as per James post 1269-and the final result compare to just LM7808 as the pre-regulator.
  Reply With Quote
Old 25th July 2008, 09:34 AM   #1483
jonners is offline jonners  United Kingdom
diyAudio Member
 
jonners's Avatar
 
Join Date: Jan 2007
Location: Cheltenham
Quote:
Originally posted by dantwomey


The ALWSR replaces the LM7808 shown on the diagram on the first page of this thread.


The shortcoming of that is that you won't get the full advantage of the ALSWR because the supply is still going through the internal 5V regulator in the LA6541 chip. (That's according to the schematic -which Erik says is incorrect. Post 1269 refers to MM1469. The chip is under the heatsink so the number is not visible.)
  Reply With Quote
Old 25th July 2008, 11:31 AM   #1484
brgds is offline brgds  Poland
diyAudio Member
 
Join Date: Apr 2006
Location: Poland
Guys,
could you advise in details how to deal with these additional regulator (I'm not newbee ) , please?
__________________
Andy
  Reply With Quote
Old 25th July 2008, 12:53 PM   #1485
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Quote:
Originally posted by brgds
could you advise in details how to deal with these additional regulator
Referring to page 16 of service manual: http://www.ferdsaudio.com/RC-EZ31.pdf

8V is connected right after choke L901 (the choke is recommended to be removed).

There is also 5V supply, based on Q902. If you want to use one super regulator you should probably start with 5V supply; in that case remove transistor Q902 and connect 5V wire from regulator to collector pad, the ground from regulator connects to negative pin of C916. You can also cut the trace from collector output (Q902) and connect external 5V there (that's why you see black wire jumper in some of my pics).

You may also consider 8V super regulator and this would connect right after choke (L901)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 25th July 2008, 02:30 PM   #1486
brgds is offline brgds  Poland
diyAudio Member
 
Join Date: Apr 2006
Location: Poland
Peter,
thanks, I didn’t realize it’s so simple…
Does it mean that if I put 5V regulator then 8V is not needed at all?
__________________
Andy
  Reply With Quote
Old 25th July 2008, 02:35 PM   #1487
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
8V regulator is required for motors, you may notice that LA6541 is powered by both 8V and 5V.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 25th July 2008, 02:37 PM   #1488
hayenc is offline hayenc  United States
diyAudio Member
 
hayenc's Avatar
 
Join Date: Apr 2005
Location: Glendale, AZ
Send a message via Yahoo to hayenc
Need to also watch the reset function on the LA6541 chip, pins 16 and 17. They appear to be driven through the in chip regulator and the data sheet is not too clear on how they work.
  Reply With Quote
Old 25th July 2008, 06:41 PM   #1489
brgds is offline brgds  Poland
diyAudio Member
 
Join Date: Apr 2006
Location: Poland
Thanks. Final check: if I leave existing 8V regulator, and add a new super 5V, all to do is to remove Q902 and supply it's output pad. As the result crucial circuits are supplied with 5V excelent regulator, and only less critical motors' driver with lower quality 8V, and the noises from motors' supply do not influence 5V supply, right?
__________________
Andy
  Reply With Quote
Old 25th July 2008, 07:29 PM   #1490
diyAudio Member
 
JC Fardo's Avatar
 
Join Date: Jun 2002
Location: Sao Paulo - Brazil
Trying to complete Andy´s question:

Are this regs a good choice

http://www.audioupgrades.co.uk/regs.shtml

Thanks
__________________
JC
  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



New To Site? Need Help?

All times are GMT. The time now is 10:40 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