Audio amplifier - Page 3 - 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 16th January 2006, 04:10 PM   #21
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
This is the reason you should always
8 Ohm non-inductive non-capacitance LOAD Resistor
when you produce your simulations, graphs and specifications.

Amplifier will plain and simple work much better and
you will get good results and specs in your design
if you avoid loudspeakers.

Should be told in user manual of amplifier:
'Loudspeakers are not recommended,
because this amplifier was created without.
Best performance you get from using our highgrade 8 Ohm LOAD Power Resistors.'

Quote:
Original signature by lineup

When you can tell sound from FFT Analyse Graph ... go sell your loudspeakers
__________________
lineup
  Reply With Quote
Old 16th January 2006, 05:10 PM   #22
Darksog is offline Darksog  Finland
diyAudio Member
 
Join Date: Jan 2006
Location: Kajaani
ok well i decide to use irfp250 200V 0.073 OHM 33A
and drop voltage + - 70v... and 6 fets and i think this is 2 ohm stabel i gointo bridge this amp and speager is 4ohm...
  Reply With Quote
Old 16th January 2006, 05:10 PM   #23
Darksog is offline Darksog  Finland
diyAudio Member
 
Join Date: Jan 2006
Location: Kajaani
now its lockked i use irfp250 Because i get it those from junked electroniks i have now 29 x irfp250 =)
  Reply With Quote
Old 16th January 2006, 10:59 PM   #24
quasi is offline quasi  Australia
diyAudio Member
 
quasi's Avatar
 
Join Date: Sep 2004
Location: Adelaide, Australia
Hi Darksog,

Please look at the chart here http://www.diyaudio.com/forums/showt...32#post794932. With 70v rails and a 2 ohm load 6 x IRFP250 (3 per rail) will quickly die.

Cheers
  Reply With Quote
Old 17th January 2006, 03:41 PM   #25
Darksog is offline Darksog  Finland
diyAudio Member
 
Join Date: Jan 2006
Location: Kajaani
Hi quasi
do you mean that i should use 4 fets per rail or drop voltage?
thanks
  Reply With Quote
Old 18th January 2006, 02:43 AM   #26
diyAudio Member
 
Workhorse's Avatar
 
Join Date: Dec 2004
You need at least 12 IRFP250 Fets to Play Safe.........

K a n w a r
  Reply With Quote
Old 18th January 2006, 03:17 AM   #27
quasi is offline quasi  Australia
diyAudio Member
 
quasi's Avatar
 
Join Date: Sep 2004
Location: Adelaide, Australia
Hi Darksog,

You can choose whether to drop the rails or increase the FETS. The chart I posted can guide you. The chart shows you that for this amp PCB, 70 volt rails and 2 ohms is not recommended. If you can make them fit, go by Kanwar's suggestion and use 12.

Cheers
  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
Schematic: Audio Innovations, The first audio amplifier maartentje Tubes / Valves 22 25th February 2010 07:34 AM
Audio Amplifier wkahc Introductions 1 31st August 2007 07:01 PM
Car audio Amplifier willo Car Audio 12 26th October 2005 04:58 PM
Audio Amplifier Help pls silverferro Everything Else 0 26th August 2004 11:15 AM
audio amplifier mephisto Car Audio 2 21st January 2004 05:52 AM


New To Site? Need Help?

All times are GMT. The time now is 02:57 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