Maplin 160W (225W) bipolar amplifier design - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 17th December 2008, 03:20 PM   #21
diyAudio Member
 
Join Date: Dec 2004
Location: Mountain View, California
For stuff about the MOSFET amps, I found this:

http://www.eastmarinedrive.com/conte...an-content.htm

EDIT: Sorry, I notice that was posted earlier - should have read more carefully!


As for the 50W kit, it's all come flooding back

I seem to remember the 50W circuit has a common emitter o/p configuration, which makes it somewhat unusual (I could be wrong, it's so long since I looked)


By way of some reference, thanks to my mate Google:

http://www.soton.ac.uk/~apm3/diyaudio/Maplin_50W.html

No circuit diagram though

Ed
  Reply With Quote
Old 17th December 2008, 03:42 PM   #22
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
I think you are right about the output stage.
Funny how you remember things. The heatsink, it was an L shaped bracket wasn't it for bolting to a larger one. The picture in the catalogue I remember, always looked like one of the holes was way off centre.
  Reply With Quote
Old 17th December 2008, 03:48 PM   #23
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
Yes, it was a common-emitter output stage using two-transistor compound-feedback-pairs.
When I get home tonight I'll see if I have the schematic. If I have I could scan it and post it here.
  Reply With Quote
Old 17th December 2008, 03:58 PM   #24
diyAudio Member
 
Join Date: Dec 2004
Location: Mountain View, California
That's it! Eventually, a kind friend of my Dad's made me an aluminium case, which solved a very difficult (and expensive) problem at the time, and provided the perfect heat sink.

Later I upgraded the power supply with two stonking great Elna Cerafine caps and a beefy rectifier. This configuration never looked back and is still a mainstay in the system, some 20 years later.

Been scouring the 'net but can't find any more info. Maplins have become a toy shop and this fine chapter of DIY hi-fi & electronics is retreating rapidly into history... A Maplin shop employee once told me they were "Turning into Tandy"

Cheers,

Ed
  Reply With Quote
Old 17th December 2008, 09:11 PM   #25
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Yep turning into Tandy for sure. The guys who run the parts counter at my local one aren't even familiar with the parts and what theyre used for!

Well... they will soon go the same way Tandy went!
  Reply With Quote
Old 23rd December 2008, 11:31 AM   #26
DaveCl is offline DaveCl  New Zealand
diyAudio Member
 
Join Date: Nov 2008
Default Maplin 160W (225W) bipolar amp design

Does anyone have any info on this amp. Circuit Dia would be fantastic. I asked Maplin about back issues with no luck.

Please help, i'm desperate to fix it.
Attached Images
File Type: jpg 100_3609[1].jpg (87.2 KB, 1575 views)
  Reply With Quote
Old 23rd December 2008, 11:34 AM   #27
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
I looked for it last weekend, but couldn't find it. I need to clear out some stuff over Christmas so I may well find the Maplin data. If I do I'll scan the schematic and post it here.
  Reply With Quote
Old 23rd December 2008, 11:35 AM   #28
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
Whoops! Just realised that you want the high power schematic. The one I have is the 50W design. Sorry!
  Reply With Quote
Old 24th December 2008, 11:47 AM   #29
balaboo is offline balaboo  United States
diyAudio Member
 
Join Date: Jun 2004
Location: South Carolina
Ouroborous;

I for one, would be interested in the 50W design !
  Reply With Quote
Old 7th January 2009, 12:32 AM   #30
DaveCl is offline DaveCl  New Zealand
diyAudio Member
 
Join Date: Nov 2008
i'm still on the hunt for any info on the amp. Maplin 160W (225W) bipolar amp design
A Circuit Diagram and parts list would be fantastic. can anyone help.
  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
Maplin 100W mosfet amplifier - power supply problem HBrunt Solid State 32 3rd December 2013 07:11 AM
Another CSS WR/FR design -- The Bipolar Bipoles planet10 Full Range 92 6th December 2012 12:29 AM
Yet another boring Bipolar amp design! ceharden Solid State 61 3rd March 2009 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 10:51 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