what do think about this schematic????? - 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 20th August 2010, 07:28 AM   #1
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
Thumbs down what do think about this schematic?????

i want to make a monster amp that is capable of driving loads upto 2E and produce some wat like 1500W RMS .... i know i sound crazy but i like to have a very powerfull monoblock to drive my subwoofers ....
Using 30 mosfets in o/p stage seems insane but I wanna keep it very well under SOA....
I had a few doubt as the drive current for 15+15 mosfets is gonna be huge and normal MJE series drive transistors do not seem to qualify .... So I went on using 2sc5200 & 2sa1943 as drivers... i have never done it so was a bit confused is this ok ...
kindly give ur comment on this I would like to give this amp a try .......

SCHEMATIC


regards
sekhar
Attached Images
File Type: gif 1500W.GIF (19.2 KB, 238 views)
  Reply With Quote
Old 20th August 2010, 07:40 AM   #2
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Albany , NY (smallbany)
Quote:
Originally Posted by sekhar View Post
i want to make a monster amp that is capable of driving loads upto 2E and produce some wat like 1500W RMS .... i know i sound crazy but i like to have a very powerfull monoblock to drive my subwoofers ....
Using 30 mosfets in o/p stage seems insane but I wanna keep it very well under SOA....
I had a few doubt as the drive current for 15+15 mosfets is gonna be huge and normal MJE series drive transistors do not seem to qualify .... So I went on using 2sc5200 & 2sa1943 as drivers... i have never done it so was a bit confused is this ok ...
kindly give ur comment on this I would like to give this amp a try .......

SCHEMATIC


regards
sekhar
With the IRF's you are not driving current driven devices. For 15 BJT pairs like MJL21193/94 , sure.. use the 2sc5200/2sa1943's. (ESP project 115) With the IRF's , you are just trying to "overpower" the gate capacitances. The 2sa1837/2sc4793 or the MJE15032/33 would be more than enough to do the job as well as offer more gain and speed. The circuit would work as is , but be careful. Ps - you forgot the output inductor.
OS
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper
  Reply With Quote
Old 20th August 2010, 07:52 AM   #3
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
THERE is a lot of thread about very high power amps in our forum & many have been given a try..... i would like u experienced diyers to give this amp a thought cause I think this amp is stable and has good sound I made this very amp but with a lot lesser supply voltage and it is still rocking at my frnds house for over than 6months . .....


regards
sekhar
  Reply With Quote
Old 20th August 2010, 09:53 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
+-80Vdc will not get you an output of 77.5Vpk on a sinewave signal.
Expect no better than 1230W into 2r0.
15Pair will probably make for excellent reliability into 4ohm speaker. Expect just under 700W into 4ohm.

I see I misread the supply voltage. You show +-85Vdc
__________________
regards Andrew T.

Last edited by AndrewT; 20th August 2010 at 10:15 AM.
  Reply With Quote
Old 20th August 2010, 09:58 AM   #5
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by ostripper View Post

(ESP project 115)

OS
project 115 is gain clone design
__________________
sometimes we know very little, and sometimes we know too much
  Reply With Quote
Old 20th August 2010, 10:09 AM   #6
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
how many fets r needed in the o/p stage so that this amp becomes virtually indestructible at any load ...????????????//


regards
sekhar
  Reply With Quote
Old 20th August 2010, 10:12 AM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
as a starter, change the Zener across the gate and source resistor.
__________________
regards Andrew T.
  Reply With Quote
Old 20th August 2010, 02:50 PM   #8
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Albany , NY (smallbany)
Quote:
Originally Posted by tinitus View Post
project 115 is gain clone design
Off by 2 .. project 117. Project 117

My point is that
Quote:
how many fets r needed in the o/p stage so that this amp becomes virtually indestructible at any load ...????????????//
This is a DREAM , give me your 50 pairs and it will not be indestructable. The layout , circuit topology , and device choices are more important than how many parts you throw at it. Then there is safety , I just spent 3 hours making a power supply that will do 100000uF , uses a 50A bridge , and can run at 100V and my greatest problem was not how many parts I could stuff it with .. but the spacing between traces for both the AC and DC to keep my safety margins to spec. Even added red and blue LED's to the rails for alert to VERY DEADLY VOLTAGE !!

My biggest amp(the ones the power supply above will power) are 250w/8r with 400+ watt peaks .... they can nearly throw every and any 15" or 18" woofer cone right out of the basket.(bounces right across the floor) That is why I have not built a 500w unit.

WHAT are you powering , and for what a 1000w analog amp costs, I can buy 5-10 500w class D amps. Another factor with many pairs is sound quality. A 2-4 pair BJT will sound better and be more reliable than a 15 pair monster.
If I had 4 inefficient 15" subwoofers rated at 300w - each , it would be cheaper, safer, and more reliable to build 4 - 250w amps than 1 big 1KW "arc welder" to power those 4 speakers.
OS
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper
  Reply With Quote
Old 20th August 2010, 05:03 PM   #9
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
this is just a dream that I am following .............. It does nt matter how many parts go into it cause its a one time build .... its nt for professional PA build .... i just wanna make large and robust ..... may be some thing that I can contribute to this great community ....

Come on guys I know its INSANE but lets make this happen ..... cause there r a lot of power fanatics who like the idea of a monstrous amp .... And with buying stuff from the market I am strictly against it ... this is whole reason I came to diy ... So that I can make my own stuff .....

regards
sekhar
  Reply With Quote
Old 20th August 2010, 05:04 PM   #10
sekhar is offline sekhar  India
diyAudio Member
 
Join Date: Jul 2009
Location: West bengal/siliguri
to andrew T
What should be zener rating for this given amp??????????

regards
sekhar

Last edited by sekhar; 20th August 2010 at 05:08 PM.
  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
Linn "LINTO" MC Preamp Schematic without SMPS - Schematic for SMPS wanted tiefbassuebertr Analogue Source 40 14th July 2014 08:10 AM
Help with schematic bzfcocon Solid State 12 24th November 2009 01:47 PM
Help with Schematic Rob11966 Tubes / Valves 11 5th December 2007 01:15 PM
Schematic Tubesin Tubes / Valves 23 23rd January 2006 01:00 AM


New To Site? Need Help?

All times are GMT. The time now is 04:53 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