Go Back   Home > Forums > Amplifiers > Power Supplies

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 13th November 2012, 08:05 PM   #5561
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
35 το 40ish will be good. You don't wanna go far up to save dissipation on the CCS. It will be running 250mA times the voltage across the reg.
  Reply With Quote
Old 13th November 2012, 08:21 PM   #5562
tinitus is offline tinitus  Europe
diyAudio Moderator
 
Join Date: Nov 2005
  Reply With Quote
Old 13th November 2012, 08:45 PM   #5563
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
How much current your application asks for?
  Reply With Quote
Old 13th November 2012, 09:21 PM   #5564
tinitus is offline tinitus  Europe
diyAudio Moderator
 
Join Date: Nov 2005
hmm, not sure
maybe 2x 3 gain stages of j310 (simple boz variant)
or just 3 stages
I have trafo with dual secondary, could make one reg for each channel
I think each jfet runs at about 5ma or so, not much
what is that ? 1watt ?
  Reply With Quote
Old 15th November 2012, 11:48 AM   #5565
diyAudio Member
 
Join Date: Apr 2010
Default shunt reg for simplistic riaa

Salas,
For the regulator on the attached pdf, aren;t the values for the VDC and VAC mixed up? It's not clear to me what you mean by "The input voltage of the shunt is 38 or 48 V DC, so a 28 or 36 V AC transformer is needed".
Can you please clarify what should be the input DC voltage to the regulator if I'm using the 28V (MM) operating circuit? Is it 36, 38, or 48V? Can you also confirm where I should go in with that voltage in the regulator?
I don't know what "force wire" and "sense" refer to either..
Attached Files
File Type: pdf Salas-RIAA-V1102F0.pdf (191.1 KB, 106 views)
  Reply With Quote
Old 15th November 2012, 11:59 AM   #5566
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
28VAC x1.35=38VDC. Don't expect x1.414 with real components. 10V drop over the regulator is a recommended number for it to work fine including some mains tolerance even.
Nothing looks mixed up.
  Reply With Quote
Old 15th November 2012, 12:04 PM   #5567
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Sense and force are 4 wire Kelvin connections.
  Reply With Quote
Old 15th November 2012, 12:38 PM   #5568
diyAudio Member
 
Join Date: Apr 2010
I guess I was confused by the operating voltage of the phono stage (28 or 38) and the transformers needed for the reg. Sorry about that and thanks again.
  Reply With Quote
Old 19th November 2012, 04:55 AM   #5569
diyAudio Member
 
Join Date: Mar 2007
Location: Bandung
Quote:
Originally Posted by Salas View Post
I have got double layer with on board rectification and filtering. Maybe you can follow some ideas from it though. If you will have your raw DC part on a different board add a decoupling capacitor across the reg's board input.
New reflektor Circuit using bipolar or Just use Bipolar Library for Mosfet? If later, it got wrong pinout. Drain M1 connect to Drain M2.

Didiet
  Reply With Quote
Old 23rd November 2012, 03:17 PM   #5570
alibear is offline alibear  United Kingdom
diyAudio Member
 
Join Date: Feb 2009
Location: Somerset
Hi all, is there a formula to calculate the heat sink size to accomodate both IRFP9240 transistors when using a version 1 circuit.
Thanks for your help
Alan
  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 06:38 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