difference between these two amplifiers - 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 25th August 2011, 09:44 AM   #1
diyAudio Member
 
Join Date: Aug 2011
Location: London
Post difference between these two amplifiers

Hi fellas

could anyone tell me that is there any difference in these two amps???
between this 400W amp:

Click the image to open in full size.


and this 250W amp:

http://www.free-circuit.com/300-watt...wer-amplifier/

is there noticeable difference between the power of these two amp because I already built that 250W amp and I like to build the 400W amp because I want more power and more windows shaking (this amp as sub amp)
my sub RMS power is 400W and maximum power is 1200W

Last edited by badcompany2all; 25th August 2011 at 10:06 AM.
  Reply With Quote
Old 25th August 2011, 10:28 AM   #2
diyAudio Member
 
Join Date: Apr 2011
Location: Pretoria
Uhm, the APEX drawing says 240W in the top left corner....

Upgrading from 250W to 400W will give you a system that plays about 2dB louder.

Punch this into your calculator to verify
10*log10(400/250)

Hardly worth the trouble.

Last edited by ingenieus; 25th August 2011 at 10:50 AM.
  Reply With Quote
Old 25th August 2011, 10:58 AM   #3
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
As above...
So how much power do you really need for domestic listening ?
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 25th August 2011, 01:01 PM   #4
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Quote:
Originally Posted by badcompany2all View Post
That's a nice amp but far, far away from 250W. With PS of +/-55V and only 2 pairs of k1058/j162 you can have about 100W RMS at 8Ohms speaker and a bit more at 4 Ohms.

OTOH, HV23 by Apex will do what is says.
  Reply With Quote
Old 25th August 2011, 01:32 PM   #5
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
The second one is essentially a type of goldmund clone...
  Reply With Quote
Old 25th August 2011, 01:39 PM   #6
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Goldmund came much later. That schematic originates in Hitachi's application note for lateral MOSFETs (1977 or 1978)
  Reply With Quote
Old 25th August 2011, 01:46 PM   #7
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
Then the goldmund is essentially a clone...)

anyway the devil is in the details...and so is the sound of a given schematic...
  Reply With Quote
Old 25th August 2011, 02:52 PM   #8
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
How is thermal compensation achieved? In APEX design, those are HEXFETs?

Last edited by Nico Ras; 25th August 2011 at 03:19 PM.
  Reply With Quote
Old 25th August 2011, 03:04 PM   #9
a.wayne is offline a.wayne  United States
diyAudio Member
 
a.wayne's Avatar
 
Join Date: May 2008
Location: Front Row Center
Quote:
Originally Posted by ingenieus View Post
Uhm, the APEX drawing says 240W in the top left corner....

Upgrading from 250W to 400W will give you a system that plays about 2dB louder.

Punch this into your calculator to verify
10*log10(400/250)

Hardly worth the trouble.
While correct, it's very misleading when discussing ( music) practical use. The 400 watt amp will have better dynamics and control ( all parameters being equal). Typically he will be using between 20-40 watts RMS for standard Din, the bigger amp will allow double the volume ( 10dB ) right up to 40 watts rms, much better dynamically with no compression vs the 250 watter, representing more than a 2 db difference when playing music.


Regards,

Last edited by a.wayne; 25th August 2011 at 03:07 PM.
  Reply With Quote
Old 25th August 2011, 03:12 PM   #10
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Hi badcompany2all,

The RAS300 is my design published around 1989 on my bulletin board at the time (before internet) and later on my web site. The schematic is based on the Hitachi app note at the time when L-MOSFETs became popular. That particular circuit and PCB layout was hi-jacked from my site some years ago. The the 300 is a number which means nothing, I give numbers to my designs, what you read into it is your business.

It is a very nice sounding amp and my later RAS-ELD and some other commercial amps that actually licensed it is based on that circuit with some refinements. Yeah, Goldmund could be a close clone, maybe they also hi-jacked the circuit.

It is good for about 250 watt peak into 8 ohms with 55VDC rails and and 300 watt peak into 4 Ohms with 42 watt rails. Even the text was badly copied on that site.

If you like the rest of the information e-mail me and I will send it to you.

Regards

Nico

Last edited by Nico Ras; 25th August 2011 at 03:22 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
Difference betweeen Class D and "Digital Amplifiers" percy Class D 105 13th March 2007 02:03 AM
pro amplifiers vs. home audio amplifiers bonsai171 Solid State 26 25th February 2004 08:24 PM
Many smaller amplifiers vs. bigger amplifiers. djdan Solid State 9 17th September 2002 04:40 PM


New To Site? Need Help?

All times are GMT. The time now is 12:46 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