Murata 7805SR - worthwhile upgrade over standard 7805 or 317? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, 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 12th January 2011, 09:18 AM   #1
diyAudio Member
 
Join Date: Oct 2005
Default Murata 7805SR - worthwhile upgrade over standard 7805 or 317?

Other than increased efficiency, would you expect an audible improvement from using a Murata 7805SR (or similar high efficiency switching regulator) in place of a standard 7805?

http://www.murata-ps.com/data/meters/dms-78xxsr.pdf

How would you expect this to perform compared to a properly implemented 317 with adjust cap?

I have a few of the Muratas on the way and will try these in a couple of DACs and Tripath amps. I'd be keen to know if others have had success with these (or not!).
  Reply With Quote
Old 12th January 2011, 10:02 AM   #2
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Hmm.Those look kind of neat,limited to 500ma (400ma for the 12V version) though.
  Reply With Quote
Old 12th January 2011, 10:34 AM   #3
djQUAN is offline djQUAN  Philippines
diyAudio Member
 
Join Date: May 2004
Location: manila
Send a message via MSN to djQUAN Send a message via Yahoo to djQUAN
this might be a problem in some applications:
Quote:
8. Dropout Voltage: 78SR series regulators described in this data sheet
specify a minimum input voltage at which full-load accuracy and output
regulation are guaranteed (7.5V for 7803SR-C and 7805SR-C, and 15.0V
for 7812SR-C
). However, these devices will stay in regulation at lower
input voltages if they are operated at less than their rated loads.
The following dropout-voltage data, derived from sample testing
performed at an ambient temperature of +25°C with resistive loads,
should be used for information purposes only. For these tests, a unit was
considered to be out of regulation when its output changed by more
+/–0.005Vdc from its nominal value. All voltages were measured directly
at the regulator’s I/O pins.
  Reply With Quote
Old 12th January 2011, 03:19 PM   #4
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
Lots of hf ripple, at frequencies where opamp supply rejection is falling fast.
Nothing is said about magnetic field from the inductor. I don't think such a low profile inductor is going to be well shielded.
  Reply With Quote
Old 25th April 2011, 02:37 PM   #5
dejanm is offline dejanm  Austria
diyAudio Member
 
Join Date: Jul 2005
Location: Vienna
Any news about the effect of using Murata instead of 7805 ?
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Worthwhile to upgrade from SB Acoustics SB29 to SS AirCirc 6600's? Tyson Multi-Way 11 29th July 2010 07:44 AM
When to use 317 and 7805? Sunsun22 Power Supplies 8 6th April 2009 06:47 PM
Use standard 317 or 317L? Christer Parts 16 7th July 2006 06:41 PM
murata caps in mesa boogie footswitch rockstudio Parts 2 16th October 2005 08:25 AM
Wide band Common mode chokes by Murata Dr.H Digital Source 2 3rd July 2003 03:29 PM


New To Site? Need Help?

All times are GMT. The time now is 01:25 PM.


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