Simple Symetrical Amplifier - Page 321 - 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 29th September 2012, 08:18 PM   #3201
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Anybody know how to test the usefulness of the R-D strings in the supply rail with simulation?
  Reply With Quote
Old 30th September 2012, 12:30 AM   #3202
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Depends on the reason you have for using R-D strings. You need to test it's usefulness for that goal.

That goal could be supply filtering, supply impedance, supply sag reduction... So your question is very vague.
  Reply With Quote
Old 30th September 2012, 01:00 AM   #3203
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Quote:
Originally Posted by keantoken View Post
Depends on the reason you have for using R-D strings.
I wanted to know one good reason.

Quote:
Originally Posted by keantoken View Post
You need to test it's usefulness for that goal.
That's the question. Except that my goal is the best overall performance.

Quote:
Originally Posted by keantoken View Post
That goal could be supply filtering, supply impedance, supply sag reduction... So your question is very vague.
For supply filtering and impedance I don't need the diode... There is another goal... but anyway, the question is... to make it simpler, will you use it in Shaan schematic?

I was afraid that rough simulation will not be precise enough to predict it's behavior...
  Reply With Quote
Old 30th September 2012, 01:40 AM   #3204
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Simulation could tell you performance specs, but those specs on't tell you if you ill like the result or not if your goal is to enjoy the sound. Simulation ill help you understand hy something changes the sound, provided you already have empirical observations to begin ith. So the process in this sense is backards: test first simulate after to understand.

As for filtering, I think it is orth a try on the current sources and/or the VAS, since there are still unprotected Early junction effects, but I think the difference ill be small. I think there may be a bigger improvement if you filter the rails ith my poer K-multipliers, so the FETs get a regulated rail. Hoever my Kmultipliers seem to ork much better on BJT output amps. I don't have a lot of experience here but the small signal area of the amp seems ell protected from the rails.

Another factor is rectifier spikes on the rails, if your supply isn't ell filtered.
Attached Images
File Type: png Kmultiplier_Poweramp_schem2.png (111.8 KB, 359 views)
  Reply With Quote
Old 30th September 2012, 02:16 AM   #3205
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by Esperado View Post
Congratulation.
If your amp does not heat too much, and once burned out a little, you can try to reduce the bias of each power unit to 150ma. Not sure for yours, but most of the power Fet/Mostfets i know seems to sound the best around this value in class Ab amps.

Now, if somebody ask-you if you can build an amp with no servo, you can just answer:
"Yes, I can".

Click the image to open in full size.
Thank you, Esperado.
Yes, I can build this SSA without servo .
My heatsink only warm... i can touch with my hand as long as i want.
  Reply With Quote
Old 30th September 2012, 02:23 AM   #3206
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by Lazy Cat View Post
Super, so also newbie can do it hehehe
Without support and help from you, shaan and esperado a newbie like me maybe wouldn't hear the beatiful sound of SSA..

Quote:
Originally Posted by Lazy Cat View Post
What's the loudspeakers you have to connect to SSA?
I'm using Bookshelf Speaker build by an expereinced DIY'er from my country.
  Reply With Quote
Old 30th September 2012, 02:28 AM   #3207
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Quote:
Originally Posted by keantoken View Post
Simulation could tell you performance specs, but those specs won't tell you if you will like the result or not if your goal is to enjoy the sound. Simulation will help you understand why something changes the sound, provided you already have empirical observations to begin with. So the process in this sense is backwards: test first simulate after to understand.
So far I believe in simulations (coupled with good engineering judgements). I can build circuits and compare by ears, and my ears is very good enough to rely on, but I want a quick and precise approach by knowing what to look for in simulation. Then I will know how to get the best.

Quote:
Originally Posted by keantoken View Post
However my Kmultipliers seem to work much better on BJT output amps.
I don't use BJT regulators in FET amps. Sometimes I use FET regulators in BJT amps (class-A). But I prefer BJT regulators for BJT amps. I use the simplest BJT multiplier for my SSA_BJT. Might try your K-multiplier, but I'm skeptical.

Power supply should be part of amplifier design. I started with transformers I have on hand. Lowering and (often) raising rail voltage of a finished amp will reduce performance
  Reply With Quote
Old 30th September 2012, 02:29 AM   #3208
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Sorry to ask a stupid question , due to my poor English: What is R-D strings ?
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein
  Reply With Quote
Old 30th September 2012, 02:34 AM   #3209
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
Today, i connect my SSA to my speaker,
and for the first time i hear a beatiful sound of this Amp. Natural Vocal, nice bass and crisp treble and more important it stable..
  Reply With Quote
Old 30th September 2012, 02:35 AM   #3210
naf is offline naf  Indonesia
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by Esperado View Post
Sorry to ask a stupid question , due to my poor English: What is R-D strings ?
maybe Resistor -Diode string sir, just guess.
  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 11:13 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