Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Studio Reference Amplifier
Studio Reference Amplifier
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 6th January 2019, 05:19 AM   #2811
Sunny22g is offline Sunny22g
diyAudio Member
 
Join Date: Nov 2016
Greetings Sir my R23 24 is 47k .I set bais 26 MV.

Here is pictures
Attached Images
File Type: jpg IMG_20190106_110542.jpg (1,009.8 KB, 381 views)
File Type: jpg IMG_20190106_110327.jpg (847.0 KB, 367 views)
File Type: jpg IMG_20190106_105729.jpg (1,003.9 KB, 348 views)
File Type: jpg IMG_20190106_105540.jpg (1,018.0 KB, 338 views)
  Reply With Quote
Old 6th January 2019, 09:29 AM   #2812
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Studio Reference Amplifier
Quote:
Originally Posted by Sunny22g View Post
Here is pictures
OK, everything looks good to me.
If I understand correctly, the main concern is lack of bass at the output, right?

Assuming the PSU is powerful enough (some 400VA transformer for both channels or at least 2 x 200VA transformers for dual mono), the only thing that can cut the low frequencies is the DC blocking capacitor at the input.
As I can see, you're using a huge capacitor placed outside the board.
Can you test the amp with just very simple - like a small 10uF electrolytic?

It would be also good to build a Bode plot but you will need an audio analyzer (or a decent sound card with appropriate software like WinAudioMLS, Arta or REW.
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/
  Reply With Quote
Old 8th January 2019, 05:50 AM   #2813
Gurpreet Turna is offline Gurpreet Turna  India
diyAudio Member
 
Join Date: Sep 2017
Location: Punjab
Quote:
Originally Posted by BC109 View Post
APEX SR20
Hello Mr. Miles and BC109, Please tell what is the right bias for SR20. I am going to make DIY Soundbar with SR20.
Attached Images
File Type: png Apex SR20.png (225.0 KB, 289 views)
  Reply With Quote
Old 11th January 2019, 04:15 AM   #2814
Sunny22g is offline Sunny22g
diyAudio Member
 
Join Date: Nov 2016
Greetings sir ,when I use electroynic capacitor. Then quality 30%down.
  Reply With Quote
Old 11th January 2019, 06:45 PM   #2815
Sunny22g is offline Sunny22g
diyAudio Member
 
Join Date: Nov 2016
Default Sr200

Hello all today I made 3.1 PCB of sr200. Always my sr200 burn this resistor. Can any 1 plz help me
Attached Images
File Type: jpg Screenshot_2019-01-12-00-14-56-554_com.miui.gallery.jpg (335.6 KB, 90 views)
  Reply With Quote
Old 11th January 2019, 06:46 PM   #2816
Sunny22g is offline Sunny22g
diyAudio Member
 
Join Date: Nov 2016
I use original PCB this time .
  Reply With Quote
Old 11th January 2019, 08:49 PM   #2817
Sabbath is offline Sabbath
diyAudio Member
 
Join Date: Mar 2015
Sunny22g
Your amp oscillate...
  Reply With Quote
Old 11th January 2019, 10:23 PM   #2818
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Studio Reference Amplifier
Exactly - this is an indication of high-frequency oscillation. Zobel network resistor burns in this case. This is what I thought was happening in the previous case as well.
How to tame the oscillation - I would talk to Apex, he may have some ideas, statistics, etc. as the designer of this amplifier.
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/
  Reply With Quote
Old 12th January 2019, 06:23 AM   #2819
Sunny22g is offline Sunny22g
diyAudio Member
 
Join Date: Nov 2016
vzaichenko thanks for helping me sir .plz tell me how to solve this .

Any 1help me about this . because I wasted lots of money and time on this .I made 3 time this amplifier (2 year ) if any 1 can help me then it's good and nice .but If cannot help me to solve this problem (mrs apex ) then it's mean I really wasted time and money .it's my last post on diy audio.
  Reply With Quote
Old 12th January 2019, 11:41 AM   #2820
apexaudio is offline apexaudio  Serbia
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
Add 18pf capacitor or similar connected from collector Q9 to base Q2 to solve oscillation problem.
  Reply With Quote

Reply


Studio Reference AmplifierHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Crown Studio Reference I: beefing up the power supply elac310 Power Supplies 4 28th April 2010 01:50 AM
Reference Amp for studio exhausted mule Solid State 0 5th June 2006 06:39 AM
studio amplifier project? rotation Chip Amps 2 2nd February 2006 05:33 AM
Any website reference for diy Audio Research REFERENCE amp and Manley Studio amp bmpa Tubes / Valves 4 19th April 2004 06:11 AM
Any information , website reference for diy Hi-End computer studio sound card? bmpa Digital Source 5 16th April 2004 05:57 PM


New To Site? Need Help?

All times are GMT. The time now is 05:54 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki