Simple Symetrical Amplifier - Page 368 - 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 7th December 2012, 07:59 AM   #3671
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by shaan View Post
My local DIY friend Bhaskar has printed six SSA boards. Yesterday I was on a visit to his home and had some unique experiences.

First, he's a genuine music-lover; has over 3000 pieces of gramophone records and most of them are pure gem recordings. Many dating to 65's! I had my first experience of listening to analog recording and I was completely blown away. The realistic feeling of the music just froze me and now I know why people say that once you get into analog, there's no coming back.

Second, he is a very kind person. He provided me with two of the six SSA boards made and now I have my own designed peeceebee at hand.

The peceebees look very well etched without any errors.

Now I'm on the way to build a pair of SSAs in the pro way LOL.

Thanks for the good wishes all.

Wow.. nice peeceebe finally you have your own board
  Reply With Quote
Old 7th December 2012, 10:47 AM   #3672
Magna is offline Magna  India
diyAudio Member
 
Join Date: Nov 2004
Location: Chennai
Nice PCB shaan...I could see your resistor CCS. I'm also revising a few changes with my SSA to take up resistor CCS, i'll let you know my results soon.
  Reply With Quote
Old 7th December 2012, 08:57 PM   #3673
shaan is offline shaan  India
diyAudio Member
 
shaan's Avatar
 
Join Date: Mar 2009
Location: Near the Ganges
And here it is. Running smoothly.

Offset setting was pretty easy; within +-5mV.

Bias perfect with 3mA, 14mA and 160mA in input, VAS and FET respectively. Without any manual setting. The input BJTs are BC550C and BC559C.

Sounds just like an SSA.

Hmm... peeceebee works for me too...

Attached Images
File Type: jpg DSC08544.JPG (141.2 KB, 403 views)
File Type: jpg DSC08545.JPG (128.1 KB, 392 views)
File Type: jpg DSC08547.JPG (147.3 KB, 373 views)
File Type: jpg DSC08549.JPG (166.3 KB, 369 views)
__________________
The PeeCeeBee Thread
  Reply With Quote
Old 8th December 2012, 09:47 AM   #3674
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Exclamation Magna's SSA HP for PA

Quote:
Originally Posted by Magna View Post
Hi LC,

Thanks LC. Its my pleasure, to have your comments on the scheme....i'm sure that will certainly improve the performance of the amp further.
Hi Magna

Comments as I promised:
- Q3, Q5 must be firmly thermally coupled, glued or grease + wraps
- input CCS-s should be top quality with thermally independent reference as in #post 3034. Replace Q8, Q11, Q12, Q13 with reference CCS-s
- C7, C62 lower to 100 uF
- C10, C34 remove these 47 pF caps, install trimmer-caps and find optimal sweet spot between lower and higher freq oscillation
- C16, C18 higher to 1000 uF
- optimally and effectively front-end should have 5 V higher rails than output stage
- C1 should be 10 uF, C5 100 pF
- D1, D13 recommend to change to 1N4732 - 4,7 V

You can fill in the whole 5 output pairs on PCB for 2 ohm loads capability.

Looking forward to see your modifications and reports.
  Reply With Quote
Old 8th December 2012, 09:54 AM   #3675
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Exclamation SSA basic principle topology

For low harmonic distortion CCS-s must have superb HF modulation suppression at least -100 dB according to nominal source/sink current.

Input BJT-s must be firmly thermally coupled.
Attached Images
File Type: jpg SSA principle.jpg (129.0 KB, 340 views)
  Reply With Quote
Old 8th December 2012, 05:53 PM   #3676
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Quote:
Originally Posted by Lazy Cat View Post
Input BJT-s must be firmly thermally coupled.
No good enough npn-pnp matched pairs available ?
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein
  Reply With Quote
Old 8th December 2012, 08:50 PM   #3677
sonnya is offline sonnya  Denmark
diyAudio Member
 
sonnya's Avatar
 
Join Date: Oct 2001
Location: Denmark
Quote:
Originally Posted by Esperado View Post
No good enough npn-pnp matched pairs available ?
They are typically about 100 In gain. And gain is typ. Very unlinear.

But you could choose bc847bpn, but they cannot handle the power.
  Reply With Quote
Old 8th December 2012, 08:58 PM   #3678
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Quote:
Originally Posted by sonnya View Post
They are typically about 100 In gain. And gain is typ. Very unlinear.
I don't understand the politic of the manufacturers. They all offer the same products under hundred of references, like in supermarkets, and misses the most useful quality products.
Hundred of white sugar packages, all the same, and hard to find brown cane.

More depressing, when you find something you really enjoy and use everywhere, it don't last: "osolete" !
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein

Last edited by Esperado; 8th December 2012 at 09:03 PM.
  Reply With Quote
Old 8th December 2012, 09:01 PM   #3679
sonnya is offline sonnya  Denmark
diyAudio Member
 
sonnya's Avatar
 
Join Date: Oct 2001
Location: Denmark
Quote:
Originally Posted by Esperado View Post
I don't understand the politic of the manufacturers. They all offer the same products under hundred of references, like in supermarkets, and misses the most useful quality products.
Hundred of white sugar packages, all the same, and hard to find brown cane.
i totally agree!!!
  Reply With Quote
Old 8th December 2012, 11:42 PM   #3680
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Quote:
Originally Posted by Esperado View Post
I don't understand the politic of the manufacturers. They all offer the same products under hundred of references, like in supermarkets, and misses the most useful quality products.
Hundred of white sugar packages, all the same, and hard to find brown cane.

More depressing, when you find something you really enjoy and use everywhere, it don't last: "osolete" !
No politics, only economy.

If they sell brown cane, will they get more profit because brown cane is better than white sugar?

How much of us need the matching properties of PNP and NPN? How much is our purchase in a year?
  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
Symetrical schematics are alike plague in Brazil, do you like them? destroyer X Solid State 151 1st July 2010 02:09 PM
Symetrical out low Zout karsten21 Tubes / Valves 5 1st February 2010 10:19 PM
going balanced/symetrical - what benefits? weissi Solid State 15 20th October 2007 08:06 AM
Symetrical field, is this? Raka Multi-Way 6 14th September 2003 01:21 PM
Non-symetrical SMPS output cm961 Parts 4 21st August 2003 10:27 PM


New To Site? Need Help?

All times are GMT. The time now is 04:09 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