Commercial complete Gainclone kit for a beginner? - Page 31 - 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 16th May 2008, 08:02 AM   #301
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
Antonio, your experience is precisely why I recommend P2P for building chip amps.

With P2P, you see exactly where the wires go, and a quick check will usually reveal any errors. When you use a board, the connections are on one side and the components on the other so it is much harder to visually inspect that everything is where it should be and connected properly.

You shouldn't have damaged anything when you took it apart although only you know how much heat you applied, and for how long it was applied.

If you did reverse the connections from the rectifier, it is likely that you will have damaged the polarised caps. Do they show any signs of bulging?
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 16th May 2008, 08:13 AM   #302
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
is this yet another case of starting up a new or modified project without a mains light bulb in the transformer's primary feed?
__________________
regards Andrew T.
  Reply With Quote
Old 16th May 2008, 08:27 AM   #303
diyAudio Member
 
Join Date: Jan 2008
Location: Brooklyn, NY
Nuuk,

I did not explain myself well. I have used a plain perforated board so in fact the new build is also p2p and I can clearly see how and where everything is connected

The caps does not show any sign of burning.

AndrewT,

I did not perform the light bulb test the second time but the rectifier board was built separately and I did not touch it between the first successful attempt and the unsuccessful one. I did test the bridge with the did tester and everything seemed ok.

Nevertheless, I will do the light bulb test as suggested.

Thanks for your help.

Regards

Antonio

Ps Any answer to the question of whether the chip can be tested with a multimeter and how?
  Reply With Quote
Old 16th May 2008, 08:39 AM   #304
diyAudio Member
 
Join Date: Jan 2008
Location: Brooklyn, NY
Quote:
Originally posted by Nuuk


If you did reverse the connections from the rectifier, it is likely that you will have damaged the polarised caps. Do they show any signs of bulging?
Nuuk,

I used the rectifier as shown here:
http://dogbreath.de/Chipamps/GainCar...nCardCopy.html

I notice that in the rectifier the V+ and V- are really mirror images and it seems that that it would not matter connecting them either way to the chip.

On the other hand the caps where connected correctly in terms of polarity and chip pins.

Anyway I will start all over again as I am surely missing something.

Regards


Antonio
  Reply With Quote
Old 16th May 2008, 08:46 AM   #305
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
As far as I know, there is no way to test the chip with a meter, other than to make sure that there are no shorts between any of the pins (unless there are meant to be as is the case with the LM3886 with pins 1 and 5).
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 16th May 2008, 09:04 AM   #306
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally posted by A Sanchez
I notice that in the rectifier the V+ and V- are really mirror images and it seems that that it would not matter connecting them either way to the chip.
Hi Antonio.
It matters. Try a 1 piece rectifier (clearly marked, like KBPC1004), or have a look at this PDF: http://electronics123.net/amazon/datasheet/k114.pdf
See the polarity of the rectifier?

MUR860's? Oh heck! Well, have a look at this picture.
Attached Images
File Type: jpg mur860 002.jpg (31.9 KB, 428 views)
  Reply With Quote
Old 16th May 2008, 04:49 PM   #307
Bluto is offline Bluto  United States
diyAudio Member
 
Join Date: Sep 2007
Location: WI.- near the Dells
Default RE: Post # 302

Good point and I think a link to that ought to be in any instructions.

Bluto
  Reply With Quote
Old 17th May 2008, 02:45 AM   #308
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Default Re: RE: Post # 302

Quote:
Originally posted by Bluto
Good point and I think a link to that ought to be in any instructions.

Bluto
That's ironic, in a way. Today, I was de-soldering MUR860's to replace them with quiet, 1 piece, commercial block rectifier.
  Reply With Quote
Old 17th May 2008, 09:27 AM   #309
diyAudio Member
 
Join Date: Jan 2008
Location: Brooklyn, NY
Quote:
Originally posted by danielwritesbac


Hi Antonio.
It matters. Try a 1 piece rectifier (clearly marked, like KBPC1004), or have a look at this PDF: http://electronics123.net/amazon/datasheet/k114.pdf
See the polarity of the rectifier?

MUR860's? Oh heck! Well, have a look at this picture.
Dan,

Many thanks for your comments.

My local supplier sells the KPBC rectifiers but not the KPBC1004. Here is the list of what they have: http://www.maplin.co.uk/Module.aspx?..._list_35_AQ98G

Could you tell me if I can use another model?

Are KBPC one piece rectifiers as good as building the rectifier with MUR680s, whcih what everyone seem to recommend?

Regards

Antonio
  Reply With Quote
Old 17th May 2008, 09:48 AM   #310
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally posted by A Sanchez
Are .... one piece rectifiers as good as building the rectifier with MUR680s, whcih what everyone seem to recommend?
no,
not everyone recommends.
Many builders use the normal commercial rectifier bridges available in ratings from 1A to 35A.
__________________
regards Andrew T.
  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
Complete beginner - Need Help Metalcore322 Solid State 3 31st March 2009 03:52 PM
Complete beginner; looking to start. kartoffel Solid State 4 11th October 2004 08:20 AM


New To Site? Need Help?

All times are GMT. The time now is 03:52 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