100W Ultimate Fidelity Amplifier - Page 4 - 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 31st March 2010, 09:11 AM   #31
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
Quote:
Originally Posted by sekhar View Post
hi every body i very new new 2 this field i corrected the circuit as said by wahab and introduced a cap parallel to R20 as I read in G.randy slones book it help in faster turn on and turn off of the transistor if I am correct plz specify the value of the cap and may be the value of R20 needs to be lowered...........

modified circuit



regards
sekhar
Do not change anything on your own before you made functional amp, then you try with upgrades.
Regards
  Reply With Quote
Old 31st March 2010, 09:21 AM   #32
diyAudio Member
 
aparatusonitus's Avatar
 
Join Date: Jan 2004
Location: Split, Croatia
What I really like about this amp is usage of Baxandall Super-pair transistors for VAS transistors...ultra fast, ultra high output impedance, ultra low output capacitance...nice!
__________________
Non ť mai abbastanza...
  Reply With Quote
Old 31st March 2010, 09:26 AM   #33
diyAudio Member
 
Join Date: Feb 2008
Nice but what about the PCB? Most diyers like me have no skills on making their own PCB layout. That is the biggest problem in making an amplifier.
  Reply With Quote
Old 31st March 2010, 09:31 AM   #34
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
Quote:
Originally Posted by butch_vlad View Post
Nice but what about the PCB? Most diyers like me have no skills on making their own PCB layout. That is the biggest problem in making an amplifier.
Go to post #18, and in my thread "150W mosfet amplifier with IRFP250" in post #31, #34 U can find PCB for Kelvin amp. In my thread "DC servo mosfet amplifier" U can find PCB for PSU and Protect, can be use with any amp module.
Regards

Last edited by apexaudio; 31st March 2010 at 09:45 AM.
  Reply With Quote
Old 31st March 2010, 11:24 AM   #35
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
I am looking forward on building this amp looks very good as i have corrected the schematics according to wahab any more inputs will be very helpful and the pcb layout
plz

regards
sekhar
  Reply With Quote
Old 31st March 2010, 11:47 AM   #36
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
Quote:
Originally Posted by apexaudio View Post
Do not change anything on your own before you made functional amp, then you try with upgrades.
Regards
i just corrected the resistor values as suggested by wahab and added a cap across R20 to decrease turn off time ......... as read by me in Slones book......
neways will make my own pcb and post it ........... it would be better if u could post working pcbs pics


regards
sekhar
  Reply With Quote
Old 31st March 2010, 12:43 PM   #37
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
Quote:
Originally Posted by sekhar View Post
i just corrected the resistor values as suggested by wahab and added a cap across R20 to decrease turn off time ......... as read by me in Slones book......
neways will make my own pcb and post it ........... it would be better if u could post working pcbs pics


regards
sekhar
U can saw correct schematics in post #22. this is very new amplifier, I suggest to build Kelvin amp, it is similar and be used over a year ago.
Regards
  Reply With Quote
Old 31st March 2010, 01:56 PM   #38
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
r u suggesting this amp and do have any pcb for this and how r the sonics..................
how can a VI limiter be introduced in circuit to prevent o/p stage destruction in event of short circuit

circuit
Click the image to open in full size.

regards
sekhar
  Reply With Quote
Old 31st March 2010, 02:43 PM   #39
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
[QUOTE=sekhar;2137834]r u suggesting this amp and do have any pcb for this and how r the sonics..................
how can a VI limiter be introduced in circuit to prevent o/p stage destruction in event of short circuit

Read post #34.
Regards
  Reply With Quote
Old 31st March 2010, 04:22 PM   #40
Account disabled at member's request
 
Join Date: May 2006
Quote:
Originally Posted by aparatusonitus View Post
What I really like about this amp is usage of Baxandall Super-pair transistors for VAS transistors...ultra fast, ultra high output impedance, ultra low output capacitance...nice!

And most probably ultra unstable too, Ive dug around, this design by apex is a clone of a yamaha amp, only that yamaha used it as a subwoofer amp, thats why you see compensation done like that 330pf cap across the feedback resistor, there was no intention for this amp to operate to normal frequencies required for full range amp. From what I can read about the yamaha amp is that it was discontinued prematurely because of problems, I can guess what those were......

Do some sims, and youll find it impossible to stabilise no matter how you try to compensate it.
  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
Good ~100W amplifier percy Solid State 16 3rd April 2013 05:16 PM
New desined 4*100W car amplifier Whortless Car Audio 13 21st July 2011 04:39 AM
Ultimate Amplifier DF Plummer Tubes / Valves 19 23rd March 2011 02:48 AM
Ultimate amplifier glen65 Car Audio 2 19th September 2007 02:15 PM
100W Amplifier Shematic and PCB viki Solid State 2 17th October 2004 11:54 AM


New To Site? Need Help?

All times are GMT. The time now is 04:44 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