Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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 28th September 2012, 06:43 AM   #5371
roender is offline roender  Romania
diyAudio Member
 
roender's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by Salas View Post
Golden section.
Golden plated PCB? (BiB)
  Reply With Quote
Old 28th September 2012, 07:03 AM   #5372
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
Immersion gold indeed.

Spandau Ballet - Gold live at IOW Festival 2010 - YouTube
  Reply With Quote
Old 28th September 2012, 07:08 AM   #5373
Dr.H is offline Dr.H
diyAudio Member
 
Join Date: Apr 2002
Probably looking to run 25V, 18V, 10V; I assume 250mA will be the sweetspot for all of them?
  Reply With Quote
Old 28th September 2012, 07:39 AM   #5374
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
250-300mA if you are sending up to 100-150mA to the load is good difference. With those parameters you are OK with the standard transistors. Use 5K trimmer with 1k2 series resistor in its tail and it should cover that range.

P.S. Hey where are some pics?
  Reply With Quote
Old 28th September 2012, 08:39 AM   #5375
Dr.H is offline Dr.H
diyAudio Member
 
Join Date: Apr 2002
My initial refleKtor was a rough rats nest. I am designing a pcb in eagle and will post pics of board once populated. Do you have a ready pcb layout? I would iron it to pcb and etch.
  Reply With Quote
Old 28th September 2012, 09:18 AM   #5376
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
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.
Attached Images
File Type: png Refl_sch.png (11.6 KB, 419 views)
File Type: png Refl_PCB.png (48.0 KB, 420 views)
  Reply With Quote
Old 28th September 2012, 09:25 AM   #5377
Dr.H is offline Dr.H
diyAudio Member
 
Join Date: Apr 2002
Thanks Salas, I tried last night and ended with a mess. Will use yours as a guide. How important is the heatsink on the M1. I understand the need for one on M2.
  Reply With Quote
Old 28th September 2012, 09:33 AM   #5378
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
Very important. Remember you burn total CCS current times (Vin-Vout) on M1. You burn Vout times (totalCCScurrent-loadcurrent) on M2. Do the power calculations for any setting conditions in each app you got in mind and estimate thermals and sinks.
  Reply With Quote
Old 28th September 2012, 09:46 AM   #5379
Dr.H is offline Dr.H
diyAudio Member
 
Join Date: Apr 2002
Thanks, will design tonite.
  Reply With Quote
Old 28th September 2012, 10:01 AM   #5380
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by AndrewT View Post
The added resistor that Roender is recommending goes before the first smoothing capacitor. (do you remember my rCRC recomendations?)
It can go between the rectifier and the smoothing cap or between the transformer secondary and the rectifier. Both of these locations are before the smoothing.

The PSU can be a simple C, or a CRC ,or a CLC, any of these work and all will work with the added R.

That added R is the reason I do not use big thick cables to connect the transformer to the PSU and through the PSU. I used to do that (40years ago) before I stated to think and simply copied what I saw others doing.

Just because you see something 100 times does not mean it is right. Sometimes what you see only once is better.
Hi Andrew
Would you care to elaborate on the Whys of using thin wire or using some resistance after the tx ?
__________________
RC
  Reply With Quote

Reply


The simplistic Salas low voltage shunt regulatorHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 04:04 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki