Any thoughts on this Amp? - 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 1st March 2005, 05:57 PM   #1
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Default Any thoughts on this Amp?

I've bought the following bits in kit form for assembly at home, these were all recommended as a compatible kit ie. it all works together.

The link to the amp is HERE

It uses Sanken SA1294 with SC3263 and is rated at around 2 x 140w into 8ohm

And here's a picture of the finished article.
Click the image to open in full size.

For the power supply I went with this one HERE. Which is decribed as power supply for amplifiers - 2x56Vmax at 14A and 2x30V 200mA

Picture of completed PCB:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

And the Input/Output stage is this one HERE

Picture of completed PCB:
Click the image to open in full size.
Click the image to open in full size.

Right my questions are twofold.

Firstly I would like to hear people opinions of the above and even better would be people with first hand experience. I have been told by a friend that it should be competent but will not offer a great performance.
You can also probably tell that this is my first step into DIY amplification but not electronics in general. I have about a year of basic theory behind me and a good soldering iron with the skill to use it well.

Secondly aside from people opinions on the performance I would like to know how the seperate components are likely to connect together. Luckily the pictures are rather large so identifying connectors shouldn't be a problem to someone familar with amp topology.
One thing that has me confused is the fact the amp looks to be dual voltage (2x56Vmax at 14A and 2x30V 200mA). I understand that you'd connect the 56V line to the amp but whats the 30V for?
Also confused as to why I'm going to need to use two toroidal's rated at 2x18v(8.3A 300VA) or at least thats what was recommended to me. Looking at the amp specs, it require 2x40-55V DC and these transformers don't seem to offer that sort of juice.

Cheers,
Ant
  Reply With Quote
Old 1st March 2005, 07:01 PM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I think it would be a big help if you could get hold of
some documentation - it's a little tough figuring it
out from the photos.
  Reply With Quote
Old 1st March 2005, 07:55 PM   #3
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Quote:
Originally posted by Nelson Pass
I think it would be a big help if you could get hold of
some documentation - it's a little tough figuring it
out from the photos.
Any thoughts as to a rough idea on performance or the toroidal transformer query?
  Reply With Quote
Old 1st March 2005, 08:06 PM   #4
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ
Found this:

http://www.bmm-electronics.com/Produ...roduct_ID=1171
__________________
Twisted Pear Audio
  Reply With Quote
Old 1st March 2005, 09:15 PM   #5
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Quote:
Originally posted by WorkingAtHome
Found this:

http://www.bmm-electronics.com/Produ...roduct_ID=1171
Thanks but I already linked that page at the top of my original post.
  Reply With Quote
Old 2nd March 2005, 01:16 PM   #6
diyAudio Member
 
hienrich's Avatar
 
Join Date: Dec 2004
Location: City of Gentle People
shin:

do you have schemes for this amp.

it's better to understand if there are schematic diagrams for this.

schematics tells partly of its performance.

regards

hienrich

email: hienrichb@yahoo.com
  Reply With Quote
Old 2nd March 2005, 06:11 PM   #7
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Quote:
Originally posted by hienrich
shin:

do you have schemes for this amp.

it's better to understand if there are schematic diagrams for this.

schematics tells partly of its performance.

regards

hienrich

email: hienrichb@yahoo.com
Hi

Won't actually get a copy of the schematic until the parts arrive unfortunately.

The Sanken SA1294 and SC3263 seem highly regarded transistors though.

I suppose the proof will be in the listening, I will of course post back here with my thought's these have been built.
  Reply With Quote
Old 2nd March 2005, 11:49 PM   #8
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
Close counts for horseshoes and handgrenades.

I see no bias tracking on the heatsink.

Handgrenade?
  Reply With Quote
Old 3rd March 2005, 01:43 AM   #9
Alme is offline Alme  Ukraine
diyAudio Member
 
Join Date: Jan 2005
Location: in Korea, presently
Maybe there's no need for temperature bias adjusting
Anyway they use sil-pad insulation, those pink pads under sankens, which adds over 1K/W thermal resistance to each package, so there's no major concern to put temperature bias sensor on heatsink unless it's glued directly to bjt case.

Shin, looks like you will need to connect all your 18V windings of both transformers in series to get required +/-50V. Do they have separated 18V windings or 36V split with central tap? First case is better.
  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
Any thoughts on this 108 cab? DaveCan Full Range 31 22nd May 2009 12:05 PM
813 Thoughts Steven-H Tubes / Valves 40 26th January 2008 02:24 AM
HT thoughts bjackson Multi-Way 5 8th February 2006 05:18 PM
Some DAC thoughts Bernhard Digital Source 9 31st January 2005 02:54 PM
Your thoughts please Ken L Tubes / Valves 41 31st October 2002 08:44 PM


New To Site? Need Help?

All times are GMT. The time now is 08:23 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