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

LT1963 - Pre Regulation
LT1963 - Pre Regulation
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 30th July 2013, 03:21 PM   #1
Koenjer is offline Koenjer  Netherlands
diyAudio Member
 
Join Date: Oct 2009
Default LT1963 - Pre Regulation

Hi there,

After reading the linear-audio test about different powersupply's, i'd like to test the LT1963 in my preamp.

The preamp needs +18v and -18v. Rotel puts in 7818/7918 as standard regulators.
And the input voltage on the 78/79 is around 22volt.

The LT1963 has a maximum input of 20v.
Is it wise to use the 7818 as a pre regulator and after that let the LT1963 regulating around 17v?

Or are there any other better solutions?
  Reply With Quote
Old 30th July 2013, 06:31 PM   #2
Headbanger is offline Headbanger  Austria
diyAudio Member
 
Join Date: Aug 2012
Location: Völkermarkt
Use diodes in series to drop out 2v or so? //Maybe use mosfet, one common type mosfet should dropout enough voltage.
How do you plan to regulate negative rail then?
Is the trafo with dual secondaries? If it is, use the regulator you wanted to with both rails, something like in attached schematic. (Don't pay attention to missing elements and using LM317 macro.)
Attached Images
File Type: jpg NONAME.JPG (37.1 KB, 643 views)

Last edited by Headbanger; 30th July 2013 at 06:50 PM.
  Reply With Quote
Old 31st July 2013, 09:27 PM   #3
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
LT1963 - Pre Regulation
LT3015 is negative reg. I am working on 317/337 to drop enough voltage to safely provide the appropriate Vin to 1963/3015
  Reply With Quote
Old 4th August 2013, 12:02 AM   #4
agdr is offline agdr  United States
diyAudio Member
 
agdr's Avatar
 
Join Date: Sep 2010
LT1963 - Pre Regulation
Quote:
Originally Posted by sonidos View Post
LT3015 is negative reg. I am working on 317/337 to drop enough voltage to safely provide the appropriate Vin to 1963/3015
That setup works really well. I'm using it on this project

A version of an O2 Desktop Amp (ODA) (schematic is first picture, power supply section at the top)

with the 317/337 pre-regulators set up to produce +/-18.5Vdc, then the LT1963A/LT3015 produce +/-16Vdc (and +/-7Vdc, two switch positions) as the final regulators.

The LT LDO's only need around 0.5Vdc drop, so for the OP's circuit he could do the same and set the pre-regs at 18.5Vdc. That would still leave 3.5V across the LM's, which is probably about the minimum. I usually try for at least 5V across them to hit all the datasheet ripple specs.
  Reply With Quote

Reply


LT1963 - Pre RegulationHide 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pre-clipping as a method of power regulation bkoopman Class D 0 1st May 2008 07:18 AM
Pre-pre; phono; pre line ;device discrete (bjt/fet) o op. amplifier GIPIONE Solid State 8 18th December 2005 10:09 PM
shunt regulation?? AudioGeek Tubes / Valves 4 26th July 2004 12:04 AM
Zen Regulation hacknet Pass Labs 3 5th April 2004 09:21 AM
Transformer regulation dhaen Parts 5 3rd February 2004 10:16 PM


New To Site? Need Help?

All times are GMT. The time now is 11:44 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki