Has any one built this 1KW amp? - Page 24 - 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 17th January 2013, 09:54 PM   #231
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
^agreed, the Leach Superamp has a different topology wrt to the output stage, with today's available output trannies like the MJ21193/Mj21194, rails of up to +-150 volts is possible....
  Reply With Quote
Old 18th January 2013, 07:11 AM   #232
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
With the MJ21195/96 the standard Leach is useable to about 100V. Above there I would go to a super-super Leach, cascoded with a level shift and a tiered supply and ORing diodes (class G). See the Crest 8001 for the general idea.

http://www.crestaudio.com/media/sche...matic_set1.pdf
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 20th January 2013, 02:14 PM   #233
diyAudio Member
 
vedmitraa's Avatar
 
Join Date: Feb 2010
Location: agra uttarpradesh india
Thanks Mr. DJK for posting crest circuit, please post Super leach Cascode Circuit also
__________________
Failure in Experiment is key to success .Only right combination is needed.
  Reply With Quote
Old 20th January 2013, 11:42 PM   #234
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
I'm suggesting you adapt the Crest schematic, it's essentially the Leach.

The basic Leach has a class AB output stage. The Super Leach has a series connected output stage to reduce the high voltage SOA demands, a bit like a cascode but the drive voltage tracks at half the required output voltage.

The Crest is like the class AB Leach with the series connected outputs of the Super Leach. When it runs close to the low volt rail the level shift zener then cascodes the series connected outputs rather than trying to do a half voltage thing. This is class G.

The Super Leach does a series connected Vas stage that also tracks the half voltage like the outputs. I would not do this, just do it like the Crest, or do a fixed cascode with an LED reference is you want to.

I assume you have the Super Leach schematics?

(they were just for reference only to compare the topology with the Crest)
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 21st January 2013, 05:51 AM   #235
diyAudio Member
 
vedmitraa's Avatar
 
Join Date: Feb 2010
Location: agra uttarpradesh india
Thanks Mr. DJK,
While searching I found all the files of Super leach in my computer including P.C.B. when Leach is giving me so good results I think super leach will do wonders with voltage divided, I will give it a try and I think this will be a hit like Leach, thanks for the Crest file also.
warm regards
__________________
Failure in Experiment is key to success .Only right combination is needed.
  Reply With Quote
Old 21st January 2013, 03:19 PM   #236
diyAudio Member
 
vedmitraa's Avatar
 
Join Date: Feb 2010
Location: agra uttarpradesh india
Default Relays for soft start of my 60 amp. 240 v. primary torrid

Thanks, for the advice,
mean while I have got some relays for the soft start circuit to be used with my 60 Amps. 240 Volts primary torrid and 40 Amps 240 volt primary torrid photos of which I have posted earlier. These relays coil 24 volts D.C. 4pair 30 Amps. silver and Silver carbon contacts each, please post a suitable soft start circuit if any body have
Attached Images
File Type: jpg Copy of 100_2288.JPG (169.0 KB, 294 views)
File Type: jpg Copy of 100_2289.JPG (105.7 KB, 277 views)
__________________
Failure in Experiment is key to success .Only right combination is needed.
  Reply With Quote
Old 7th March 2013, 01:07 PM   #237
diyAudio Member
 
Join Date: Dec 2011
Default DISTORTION

Hello Workhorse Sir
i assembled your drive its working but at low volume sound
is distorted i tested drive on 1 pair 2sc5200 at 8 ohms load on 70 volts dc +/-
will distortion go if i add more pairs
warm regards
sameerx1
but what remains silly is the distortion at low volume even Kimberlator experienced this distortion
  Reply With Quote
Old 7th March 2013, 01:26 PM   #238
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
Quote:
Originally Posted by sameer x1 View Post
Hello Workhorse Sir
i assembled your drive its working but at low volume sound
is distorted i tested drive on 1 pair 2sc5200 at 8 ohms load on 70 volts dc +/-
will distortion go if i add more pairs
warm regards
sameerx1
but what remains silly is the distortion at low volume even Kimberlator experienced this distortion
To enhance the low level signal clarity, put one more diode connected transistor in series with other two already in the schematic and set the trimmer accordingly to get 20mA idle current in output devices.
  Reply With Quote
Old 10th March 2013, 04:53 AM   #239
diyAudio Member
 
andrewlebon's Avatar
 
Join Date: Feb 2008
Default Hello

Hi Workhorse
greetings today is a very special day for you HAVE FUN
warm regards
andrew
__________________
[image][/image]"It's Better to try and fail than to never know and always wonder"
  Reply With Quote
Old 10th March 2013, 08:58 AM   #240
diyAudio Member
 
vedmitraa's Avatar
 
Join Date: Feb 2010
Location: agra uttarpradesh india
Default ULTRA-CLEAN

Friends here I present A design Named by me "ULTRA- CLEAN". this is around 1KW at 2 ohm's load with distortion down to "0.001%".for real hi-fi lovers and with a slight change around 2 kW. on 1ohm load at 0.002% distortion and, on 2 ohm more than 48 volts at out with 0.002% distortion and around 1116 watts
Attached Images
File Type: jpg ultra clean at 2ohm 0.001%.JPG (208.5 KB, 189 views)
__________________
Failure in Experiment is key to success .Only right combination is needed.
  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
Hi! And I built one too... The RB Chip Amps 4 13th March 2009 09:12 AM
i built these a while ago and roystr Full Range 11 10th November 2005 12:49 PM
Who has built their own? markp Solid State 42 29th June 2004 09:42 PM
Anyone built this amp? JojoD818 Solid State 26 19th August 2003 11:32 AM


New To Site? Need Help?

All times are GMT. The time now is 04:35 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