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.

my last amplifier design "911"
my last amplifier design "911"
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 15th September 2013, 04:23 PM   #1
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
Default my last amplifier design "911"

I'm working on for 3 years CFB amplifiers.
I completed my design has a great voice. very good feedback.
Attached Images
File Type: jpg IMG_0543.jpg (795.7 KB, 281 views)
File Type: jpg IMG_0531.jpg (980.1 KB, 261 views)

Last edited by 400kg; 15th September 2013 at 04:39 PM.
  Reply With Quote
Old 15th September 2013, 04:36 PM   #2
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
Default scope screens

with no bias 1khz - 10khz - 20khz - 50khz - 100khz
Attached Images
File Type: jpg 1khz.jpg (937.8 KB, 206 views)
File Type: jpg 10khz.jpg (939.8 KB, 158 views)
File Type: jpg 20khz.jpg (927.7 KB, 141 views)
File Type: jpg 50khz.jpg (953.5 KB, 47 views)
File Type: jpg 100khz.jpg (897.7 KB, 60 views)
  Reply With Quote
Old 20th September 2013, 11:38 AM   #3
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
redraw
Attached Images
File Type: jpg Ads?z.jpg (131.4 KB, 158 views)
  Reply With Quote
Old 20th September 2013, 01:23 PM   #4
padamiecki is offline padamiecki  Poland
diyAudio Member
 
Join Date: Mar 2004
Location: Krakow
Quote:
Originally Posted by 400kg View Post
with no bias 1khz - 10khz - 20khz - 50khz - 100khz
nice
but there is bias 200mA through each output transistor - have you got bias or not?
__________________
regards, Pawel
  Reply With Quote
Old 20th September 2013, 05:09 PM   #5
sgrossklass is offline sgrossklass  Germany
diyAudio Member
 
Join Date: Nov 2004
Location: Germany
1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg.
2. You're using a cascoded VAS which may have high output impedance, but only an EF2 output stage. With compensation and stuff, it shouldn't be that bad, plus you have two pairs of outputs, but you may still be giving away some performance with lower-impedance loads (you should always be designing for 4 ohms, as even a number of "8 ohm" speakers' specs are blatantly lying).
  Reply With Quote
Old 20th September 2013, 05:17 PM   #6
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
Quote:
Originally Posted by padamiecki View Post
nice
but there is bias 200mA through each output transistor - have you got bias or not?
Hi
I made some tests.Osc shows zero biased results.You can increase the bias up to 900ma.
  Reply With Quote
Old 20th September 2013, 05:24 PM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by sgrossklass View Post
1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg........
No.
The schematic as drawn has the Vr in the correct location.
__________________
regards Andrew T.
  Reply With Quote
Old 20th September 2013, 09:42 PM   #8
400kg is offline 400kg  Turkey
Banned
 
Join Date: Jan 2012
Location: kangal/sivas
Send a message via MSN to 400kg
Quote:
Originally Posted by sgrossklass View Post
1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg.
2. You're using a cascoded VAS which may have high output impedance, but only an EF2 output stage. With compensation and stuff, it shouldn't be that bad, plus you have two pairs of outputs, but you may still be giving away some performance with lower-impedance loads (you should always be designing for 4 ohms, as even a number of "8 ohm" speakers' specs are blatantly lying).
hi
I do not understand it which is low impedance stage ?
  Reply With Quote

Reply


my last amplifier design "911"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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Joe Rasmussen "Trans-Amp" - 40 Watt Transconductance "Current Amplifier" Joe Rasmussen Chip Amps 363 3rd January 2018 02:08 AM
"WTB" "The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral enantra Swap Meet 3 23rd December 2012 07:36 PM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 07:42 PM
The "Leap-Frog" Method Of Switching Amplifier Control Loop Design analogspiceman Class D 29 1st December 2006 04:21 PM


New To Site? Need Help?

All times are GMT. The time now is 03:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki