The simplistic Salas low voltage shunt regulator - Page 590 - diyAudio
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 21st April 2013, 08:09 PM   #5891
diyAudio Member
 
Join Date: Mar 2009
I am a little bit curios and intrigued
what difference are between magnetic and non magnetic resistors?
do the non magnetic CMF55-143 woth the purchasing?
  Reply With Quote
Old 22nd April 2013, 04:08 AM   #5892
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
No magnet picks them up. Copper leads mainly or other non magnetic alloys. Subjective buffs say it matters. The CMF are good quality parts in general to have. Good temp coefficient, low ppm, good HF characteristics, self noise is low.
  Reply With Quote
Old 22nd April 2013, 06:17 AM   #5893
diyAudio Member
 
Join Date: Mar 2009
the reading I did this last weekend drive me nuts
I think it`s enough with the reading...I have to start building

wanted to change my amp resistors too, actually rn55d with non magnetic cmf ones but after I asked my mentor here on this forum changed my mind ..
now after the things you sayid I think I will stick to normal cmf`s for my ps`s.
thank you guys for you existence and the help you give here on the forum, really apreciated


wish you a very nice week

Last edited by schultzsch; 22nd April 2013 at 06:28 AM.
  Reply With Quote
Old 22nd April 2013, 06:06 PM   #5894
BigE is offline BigE  Canada
diyAudio Member
 
Join Date: Aug 2008
Location: Toronto
What is the rule of thumb for sizing a transformer for a shunt regulated supply?

Is this Expected load requirements + X amps for the regulator?
  Reply With Quote
Old 22nd April 2013, 06:40 PM   #5895
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
At least 3x the consumed watts spec as asked by the CCS setting at input voltage should keep the Tx cool.
  Reply With Quote
Old 22nd April 2013, 06:41 PM   #5896
BigE is offline BigE  Canada
diyAudio Member
 
Join Date: Aug 2008
Location: Toronto
Thank you!
  Reply With Quote
Old 1st May 2013, 02:04 PM   #5897
diyAudio Member
 
Join Date: Mar 2009
salas do you know any trusted supplier for k170 and k117?

I have just ordered some nice russian 50nf silver mica caps
  Reply With Quote
Old 1st May 2013, 02:20 PM   #5898
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Look in ampslab site. Look also in fetaudio site.
  Reply With Quote
Old 1st May 2013, 05:34 PM   #5899
diyAudio Member
 
Join Date: Mar 2009
I saw at ampslab that they also have low noise bjt`s Original Small Signal Audio Bipolar Transistors - Buy OnLine @ AmpsLab

which low noise pnp type do you reccomend in place of 2N4403?
I saw Kon`s last schematics for the reflektor and I too would like to try what he did
would like to use a complementary low noise pair from ampslab(if there is one that matches for my requirements) so in this way I will have a spare for future projects too

the k170 he uses is bl and k117 is gr right?
  Reply With Quote
Old 1st May 2013, 07:10 PM   #5900
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
2N4403 have noise performance in par with 2SA970 keep in mind. That is why I designed around them, a poor man's special and its everywhere to get.

K117 is GR don't use BL anything if not necessary due to stock bcs you will need much IDSS down-regulating resistance that will up its intrinsic noise.

Get a few 2SC2240 & 2SA970 those match well for P-N curves on my tracer. Alas, ampslab has them in BL to GR. So no go. Find some elsewhere. BL if possible.
  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 03:29 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