My Poweramp-thougts. Need input - 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 January 2008, 07:32 PM   #1
diyAudio Member
 
Join Date: Mar 2005
Location: Near Gothenburg, the westcoast of Sweden
Lightbulb My Poweramp-thougts. Need input

Hello all DIY folks, ladies and gentlemen

This is my first post here, at last. I have been lurkin here for ages. Thats not normal for me.
I am often a contributor and have no problem with the verbal or writing in several different forums around the world. I am a big hobby enthusiast in electronics, but also genealogy and old American musclecars, among some other things.

My desire for a power amplifier which I have built myself have come up to my mind lately. I have gathered components through the years but after some extensive reading at this forum, old and new threads, several hours a day the last week , I understand that my old 4 pairs of TO3 Toshiba's, 2SB557 and 2SB427 is more or less obsolete and weak when it comes to the specs.

What I have in parts, whiches and knowledge
I have two EI transformers which I don't have data on but have measured to be something a bit over 200 VA or 58VCT@3.6A.
Four fresh electrolythics 10mF 63V. I have then about +/- 45 volt at idle and ~ +/- 40 after rectifyer and elyts.
The hardware including the cooling is no problem. I have plenty of surplus. I also want to etch my PCB for myself. I have equipment and experience but only for singlesided boards.

I have come over some ThermalTrak devises I would like to use in two pairs per cannel for this PSU's. So about 80W@8 ohm, 150W@4 ohm and maybe some current limit at 200w/channel.


What have I seen in this community?
I have read a lot of good reading and have get stucked on two designs that I want to do.
No.1 is Marshall Leach low TIM amplifier, version 4.5. When I first read about it here I faintly remembered an old article I have in a binder i our cellar. Could it be the same Mr. Leach ? Yes, I realised I had a copy of the first article from a Magazine called Audio, from 1977. I was in highscool then.I have memorys from a teacher who was sold on that amp.
Another fine "cute" project is MikeB and his Symasym 5.3 and particulary the one that evolved from the really capable authority roener at this forum. He also did a very fine singlesided Eagle layout but then... What happened? Is there anyone out there that has got one to share. I would very much like to continue with that one. Maybe MikeB knows of any further development and variants of the Symasym5.3 with the option to have two pair of ON Semiconductors ThermalTrak devises?

I would be glad for any project suggestion using two pairs of output transistors, ThermalTrak devices which will fit the PSU's I have at hand, Thank you.
__________________
Cheers// Ove
  Reply With Quote
Old 23rd September 2010, 09:01 PM   #2
diyAudio Member
 
Join Date: Mar 2005
Location: Near Gothenburg, the westcoast of Sweden
Default Ha ha

Ha ha
I'm sorry
I see why I don't got any answers on this one

So, if I triggered some more people that doesn't bother to read it all. Your not alone. Let this thread be a learning lesson.

I'm sorry, I allways speak and think to much ...

__________________
Cheers// Ove
  Reply With Quote
Old 23rd September 2010, 09:20 PM   #3
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007

That's why I haven't started a single thread in here !
  Reply With Quote
Old 23rd September 2010, 09:57 PM   #4
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by Radioman62 View Post
Ha ha
I'm sorry
I see why I don't got any answers on this one

So, if I triggered some more people that doesn't bother to read it all. Your not alone. Let this thread be a learning lesson.

I'm sorry, I allways speak and think to much ...

Should admit that the lengthy question did surely also
beg some lengthy time....

Here we are !
In the waiting, did you find a design that fits your expectations.?....
  Reply With Quote
Old 23rd September 2010, 10:55 PM   #5
diyAudio Member
 
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
Send a message via MSN to smartx21 Send a message via Skype™ to smartx21
Why don´t you take some time to read Wahab's interesting thread Diy audio popular amps simulations?
It may light up your thoughts.
Regards,
Max.
__________________
Regards,
Andres
  Reply With Quote
Old 24th September 2010, 03:13 PM   #6
diyAudio Member
 
Join Date: Mar 2005
Location: Near Gothenburg, the westcoast of Sweden
wahab
After many turns I bought 6 PCB cards from another DIY member
It uses the nice National Instruments LME49810/11 as driver for thermalTrak devices. Why bother do do my own PCB when it's allready done as I want it? I gained some time there.
Those 6 amps will be the ground for my active speaker projekt.
First I thought of building my own filter but instead i bought the really good Behringer Super-X Pro CX3400 for 171$. I couldn't even buy the contacts and knobs for that price if I would build my own.

That project is on rest for a phono amp at the moment. I'm fiddling with the really simple but good sounding and measuring FET RIAA stage.
__________________
Cheers// Ove
  Reply With Quote
Old 24th September 2010, 04:23 PM   #7
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by Radioman62 View Post
answers
Well, excuse me, what was the question again ?

(it'll probably take 10 years for thermaltrak devices to become established, 10 more to see designs, which is around the time the parts turn obsolete)

Eeer, i know you, you're the Cougar 351 bloke.
__________________
The buck stops Here
  Reply With Quote
Old 24th September 2010, 08:26 PM   #8
diyAudio Member
 
Join Date: Mar 2005
Location: Near Gothenburg, the westcoast of Sweden
Smile American muscle car

Hi jacco

I reckoned your alias as well. Didn't you fart in the 10w class A from the aussie man ... what was his alias... ? The Kleinschmidt 10A
Hmm. I just now discovered that he had disengaged his user id. That was not so funny. He was a descent good thinking idé maker of a man. ... Not good at all.

Anyway jacco ... are you doing any Nobel prize projects ftm. ?
__________________
Cheers// Ove
  Reply With Quote
Old 25th September 2010, 01:48 PM   #9
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Sot Fart multi-room media/music server, Knobby prize maybe.
No room for Thermaltraks though.

(modular thing, Dominican rep. made split bobby PS, balanced discrete stuff, integrated Phily cd-pro2. Something like an olive/kaleidescape/crestron mix, but much biggy. Steal much, invent little)

Ditto, still sorry he Skippy'd out.
__________________
The buck stops Here

Last edited by jacco vermeulen; 25th September 2010 at 01:51 PM.
  Reply With Quote
Old 25th September 2010, 04:12 PM   #10
diyAudio Member
 
Join Date: Feb 2006
Location: Dundee
Quote:
Originally Posted by jacco vermeulen View Post
(it'll probably take 10 years for thermaltrak devices to become established, 10 more to see designs, which is around the time the parts turn obsolete)
You might want to have a look at the August issue of Everyday Practical Electronics, where a 200 watt amp. using Thermaltrak items is put forward as a construction project.

4Hz to 50kHz
135W into 8R
200W into 4R
Noise -122dB at 135W output
Distortion 0.001% typical.

I think you'll find many amp designs using these devices coming out much quicker than you might think.

Sandy
  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
YAP - Yet Another PowerAmp syn08 Solid State 315 4th October 2011 11:39 PM


New To Site? Need Help?

All times are GMT. The time now is 06:11 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