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

Chip Amps Amplifiers based on integrated circuits

Problem with MyRef Rev C based on LM3886
Problem with MyRef Rev C based on LM3886
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
Thread Tools Search this Thread
Old 18th January 2012, 04:55 PM   #21
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
PINs 9 & 10 are the +IN and -IN inputs.

All opamps should have almost identical voltages on these two PINs.
Something is seriously wrong.
regards Andrew T.
  Reply With Quote
Old 29th May 2012, 02:34 PM   #22
vishnupg is offline vishnupg  India
diyAudio Member
Join Date: Jan 2010
hamand do one thing, first of you remove lm318 from the slot,
then power on the board and ensure that you have -35 volts and +35 volts on those two big capacitors.you must keep negative terminal of multimeter on ground in the pcb(the common track for those caps is the ground) while measuring this. if you have the voltage ok there then your power section is ok.

then measure the voltage at pins 1,5,4 with respect two ground. 1 and 5 must have +35 volts and 4 must have -35 volts.

let us see the outputs
  Reply With Quote
Old 1st July 2012, 02:50 PM   #23
vinodt1347 is offline vinodt1347  United Kingdom
diyAudio Member
Join Date: Aug 2010
The LM3886 chip shows very low voltages at Vin+ and Vin-. Obviously something is very wrong. Would suggest you remove all the semiconductors and check the rectifier side to see if you get aprox 1.4 x Vac at the filter caps. Check to see if there are any shorts and component values placed for Resitors and Caps. If this step fails you may need to reconstruct the board. I did purchase this from Siva and it worked first time.
BTW I am impressed with your Enclosure and transformer? Where did you source these?
  Reply With Quote


Problem with MyRef Rev C based on LM3886Hide 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
My new monobloc layout for Mauro Penasa's MyRef Rev. C Russ White Chip Amps 108 27th November 2016 11:39 AM
WTB myref rev c amp anonomouse Swap Meet 1 26th July 2011 01:34 PM
Selling 2 x MyRef RevC LM3886 based pcbs vinodt1347 Swap Meet 0 9th June 2011 09:04 PM
FS: MyRef Rev C pair Mindcrime Swap Meet 2 9th November 2009 11:41 PM
MyRef Rev C or Amp 5? preiter Chip Amps 2 30th January 2007 06:28 PM

New To Site? Need Help?

All times are GMT. The time now is 07:14 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio