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

Vendor's Bazaar Commercial Vendors large & small hawking their wares

First One - mosfet amplifier module
First One - mosfet amplifier module
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 7th February 2016, 06:33 AM   #2431
meanman1964 is offline meanman1964  Belgium
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
I've the same problem with my FO1.2 but does not have this problem with a conventional PSU
  Reply With Quote
Old 7th February 2016, 06:38 AM   #2432
taccodude is offline taccodude  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: home
So You think it`s the SMPS ? I didn`t have the Problems before,I think. Listend with Fetzilla and F4 for a while.

Last edited by taccodude; 7th February 2016 at 06:54 AM.
  Reply With Quote
Old 7th February 2016, 07:23 AM   #2433
hose4 is offline hose4  Slovenia
diyAudio Member
 
Join Date: Jun 2013
Quote:
Originally Posted by taccodude View Post
Last Night I found out ,when I turn off the Amp,there`s a Tone out of the Speakers ,which starts loud and gets quieter ,till it`s gone.
I think that is normal. When the power supply voltage goes down the amp develops some kind of audible oscillating sound.

When LC was demonstrating his prototypes we discovered that lower supply voltages made amp less stable than higher. He made modifications to the pcb and during normal operation amps is ok. During switch off some tone is there up to 30 seconds.

I use smps1200a180. If you are good with soldering iron there is a mod which could help. Ask LC for info.
  Reply With Quote
Old 7th February 2016, 07:57 AM   #2434
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Hi taccodude
Did you perform calibrations as recommended in manual? Did you checked wiring? Is noise still present?
  Reply With Quote
Old 7th February 2016, 08:47 AM   #2435
taccodude is offline taccodude  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: home
Noise is still there ,just tried some different wiring,but doesn`t make a difference.Calibration is not so easy,the Spot are so tiny and my smallest Screwdriver doesn`t fit.What about the Mod Hose4 told?
  Reply With Quote
Old 7th February 2016, 09:03 AM   #2436
Lazy Cat is offline Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by taccodude View Post
Noise is still there ,just tried some different wiring,but doesn`t make a difference.Calibration is not so easy,the Spot are so tiny and my smallest Screwdriver doesn`t fit.What about the Mod Hose4 told?
When SMPS turned off there's high ripple on SMPS output rails, causing potential audible tone, since speakers are directly connected, no relay contacts in between. But that is very rare, all amps I assembled don't have this or any other noise. It looks you will have to perform recommended calibrations as per manual, eventually.
  Reply With Quote
Old 7th February 2016, 09:16 AM   #2437
hose4 is offline hose4  Slovenia
diyAudio Member
 
Join Date: Jun 2013
Quote:
Originally Posted by taccodude View Post
Noise is still there ,just tried some different wiring,but doesn`t make a difference.Calibration is not so easy,the Spot are so tiny and my smallest Screwdriver doesn`t fit.What about the Mod Hose4 told?
One question. Is noise present during normal operation of the amp or during power off only? If power off only don't worry about it. Because of the lower voltage on a180 smps's the mod is implemented on series modules which are the ones you already have. You should be fine.
  Reply With Quote
Old 7th February 2016, 11:09 AM   #2438
Mark Verhoeven is online now Mark Verhoeven  Netherlands
diyAudio Member
 
Join Date: May 2009
Taccodude, did you change the source? Your problem can be caused by the interaction between source and FO.

I've had massive problems (unsolvable) with one source and perfectly silent with another.

Last edited by Mark Verhoeven; 7th February 2016 at 11:11 AM.
  Reply With Quote
Old 7th February 2016, 11:28 AM   #2439
Mark Verhoeven is online now Mark Verhoeven  Netherlands
diyAudio Member
 
Join Date: May 2009
Double post...

Last edited by Mark Verhoeven; 7th February 2016 at 11:30 AM.
  Reply With Quote
Old 7th February 2016, 12:56 PM   #2440
taccodude is offline taccodude  Germany
diyAudio Member
 
Join Date: Jan 2006
Location: home
Just tried different Wires for Speaker and Interlink,no differnece,even when I unhook the Source ,the Noise from the Tweeter is there.Then I changed to conventionell PSU (60V) and the Noise is gone. Is there something wrong with SMPS or can I try something else ? If SMPS is not ok ,that would be second Time ,Hypex is too expensive for that.
  Reply With Quote

Reply


First One - mosfet amplifier moduleHide 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
800 Watt MOSFET Amplifier Module The Saint Holton Precision Audio 75 18th July 2013 11:16 AM
MOSFET POWER AMPLIFIER MODULE IN EBAY INDIA reji Vendor's Bazaar 0 19th March 2013 01:52 AM
class D amplifier module,power amplifier module sunlight009 Vendor's Bazaar 2 19th October 2011 01:02 AM
NX400 - 400W RMS@4Ohms Lateral Mosfet Power Amplifier Module by Class-D for sale magnum_1 Swap Meet 16 13th June 2009 03:59 PM
Help with Mosfet module please Beejay Solid State 6 11th September 2008 03:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:36 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki