50W Stereo Kit amp runs for 1 min, clips then turns off. - Page 8 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 3rd March 2012, 10:07 AM   #71
Al600 is offline Al600  Australia
diyAudio Member
 
Join Date: Mar 2012
The amp's been making music for 5 minutes without fail now. It turns out that the amp did indeed need the 2 secondarys to be serially connected. I very much appreciate everything you guys have done for me. Thank you for all you posts.
  Reply With Quote
Old 3rd March 2012, 10:09 AM   #72
just another
diyAudio Moderator
 
wintermute's Avatar
 
Join Date: Aug 2003
Location: Sydney
Blog Entries: 22
Al600, don't just connect things up without being sure about what you are doing! Andrew is right you are dealing with 240V mains which is potentially lethal. (ok so I'm too late, but still check the phase of the secondaries is correct).

Before you connect any of the windings together check that they are colour coded correctly.

Check red and black with the multimeter it should read low ohms.
check white and orange again it should be low ohms.

If you get that then you can go ahead and connect as pixo has posted. There is one additional check you should make after doing this. Check that when operating the voltage from red to orange is 50V AC. If it reads 0V then the secondaries are wired out of phase, and you will need to swap one of the two windings. eg swap the position of red and black (but only if you measure 0V).

I'm surprised Andrew didn't mention the bulb tester. You can search for Bulb tester here on diyaudio. Basically it is just a 240V light bulb in series with the mains, but it should be built into a safe enclosure. If the Amp draws too much current (because of a fault condition) the bulb will light up but save it from being fried.

I would have thought that a mains kit from Altronics would have had very explicit instructions on how the wiring should be carried out. I would suggest re-reading the instructions very thoughroughly and ensuring you understand them properly.

edit: Andrews concern about the secondaries being mislabled was well founded. The first amp kit I made in 1987 had the colour codes on the secondaries mixed up. When the transformer was connected according to the instructions the secondaries were shorted. I'd never heard of a bulb tester, and the transformer crackled. I got it replaced under warranty, but it was not as good a unit as the original. I ALLWAYS check now!!

Tony.
Attached Images
File Type: png windings.png (20.4 KB, 59 views)
__________________
Any intelligence I may appear to have is purely artificial!
Some of my photos

Last edited by wintermute; 3rd March 2012 at 10:10 AM. Reason: I see I was a bit slow in posting.
  Reply With Quote
Old 3rd March 2012, 10:16 AM   #73
Al600 is offline Al600  Australia
diyAudio Member
 
Join Date: Mar 2012
I have a fair idea of how to wire things in general, it's just that the manual was not at all explicit in how the transformer was supposed to be wired. I very much appreciate all the help you have given me. The rails that I posted about earlier are now running at almost exactly 36V which is a heap better than before. I double checked that the secondary coils were in the right order before applying voltage. Safety is my main priority (although it may not come across as such in my posts). Once again your posts have been awesome and I'll endeavour to learn more and contribute to this community as best I can.
  Reply With Quote
Old 3rd March 2012, 10:19 AM   #74
Pixo is offline Pixo  India
diyAudio Member
 
Join Date: Sep 2003
Quote:
Originally Posted by Al600 View Post
The amp's been making music for 5 minutes without fail now. It turns out that the amp did indeed need the 2 secondarys to be serially connected. I very much appreciate everything you guys have done for me. Thank you for all you posts.
post a picture of how you've got your amp wired up now, including the transformer
  Reply With Quote
Old 3rd March 2012, 10:33 AM   #75
Al600 is offline Al600  Australia
diyAudio Member
 
Join Date: Mar 2012
As you can see I've got Red and Orange running to the outer terminals of the PS.
I've connected the 2 centre wires of the transformer output together and run a third wire to the centre pin of the PS (the 2 transformer wires won't both fit in the pin hence the 3rd wire). All is running well. Voltages are as normal. I'm still alive.
Attached Images
File Type: jpg IMAG0365.jpg (723.1 KB, 60 views)
  Reply With Quote
Old 3rd March 2012, 04:04 PM   #76
diyAudio Member
 
lanchile's Avatar
 
Join Date: Sep 2008
Location: AREA 51
Quote:
Originally Posted by Al600 View Post
The amp's been making music for 5 minutes without fail now. It turns out that the amp did indeed need the 2 secondarys to be serially connected. I very much appreciate everything you guys have done for me. Thank you for all you posts.
I am glad it is working now! if you have background noise, check for ground loops and input wires (not to be close to transformer)
  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
Bridged LM4780 kit: 5 Ohms (Min) at 300Hz = smoke? Plammox Audio Sector 5 10th December 2009 03:44 PM
Teac AG-v8050 home receiver turns off after it turns on eroc1313 Chip Amps 1 20th November 2009 03:18 AM
Precision Power PC6600.2 Amp turns on then immediately turns off. Need help! autolink Car Audio 4 15th March 2009 02:12 AM
Chip Amp LM3886 stereo kit - built & ready to go cdoggy81 Swap Meet 8 24th February 2009 08:26 PM
Looking for amp kit that runs on 12V (car battery) maurycy Chip Amps 5 2nd October 2008 08:29 PM


New To Site? Need Help?

All times are GMT. The time now is 08:36 AM.


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