Destroyer x Amplifier...Dx amp...my amplifier - Page 112 - 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 2nd May 2007, 12:33 PM   #1111
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Those heatsinks will be a good inclusion Nordic.


Mine is not using, and temperature there is 37 celsius as i publish the image measuring that temperature...not a problem.

But using heatsinks you will work with lower temperature..this will make your amplifier work till year 2300 than the 2200 life expectations.

Well...will not be working, as speakers will be substituted by sensors in your skin.... behind the ear.... power will be microwatts.

hehe...future will be very interesting....you will control emotions.... try to imagine not to laugh when your receive the informs your damn boss died!....in the future you will have a button to turn you sad... very convenient..adequated.. a nice
behavior....hehe

And yes...you are rigth Nordic...i have suggested the use of heatsinks...see the image i have posted monthes ago.

Carlos
Attached Images
File Type: jpg l shape heatsink.jpg (57.3 KB, 605 views)
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 2nd May 2007, 02:02 PM   #1112
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default The nice Dx amplifier, using the final boards, is beeing tested in Australia.


A couple of weeks will be used during those testings.

A laboratory tests will be performed...all needed instruments will be used into a research of distortions.

Listening A to B blind testing will be performed too.

regards,

Carlos
Attached Images
File Type: jpg under testing.jpg (68.4 KB, 500 views)
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 2nd May 2007, 02:06 PM   #1113
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Greg made perfect boards.


I am very proud about it...and happy with Greg too.

regards,

Carlos
Attached Images
File Type: jpg img_2556.jpg (77.5 KB, 474 views)
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 2nd May 2007, 03:40 PM   #1114
HOEK is offline HOEK  Netherlands
diyAudio Member
 
Join Date: Apr 2005
Location: Burgum
Hello

What amps will be used with blindtesting ?
  Reply With Quote
Old 2nd May 2007, 04:26 PM   #1115
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Dag Hoek, I assume he means the 3 biasing options etc...
  Reply With Quote
Old 2nd May 2007, 04:51 PM   #1116
HOEK is offline HOEK  Netherlands
diyAudio Member
 
Join Date: Apr 2005
Location: Burgum
I understand



groet hoek
  Reply With Quote
Old 2nd May 2007, 05:13 PM   #1117
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Greg has many amplifiers in his home.


Also he knows how to compare, the blind testing method.

For sure he will compare, to check if really, using this board, the amplifier can perform so good as more expensive units...as the idea was to make something simple and cheap that could not be ashamed by other amplifiers.

Even to loose in something is reasonable, as we have to pay the price by the simplicity and the low diy home production cost.

Many famous amplifiers are there in Greg's home...and many of them in the same power ratio...some are Kits and others are industrial made units from the seventies and eigthties..

He may check the quality of audio reproduction not to be fooled, as designers and partners use to be a litlle biased....and A to B, beeing blind, is the tool we have to obtain more precision in the judgement made.

But do not wait the publicity alike "Dx amplifier smashed Thatone"...this is something we do not like....i dislike this behavior...a dirty action, and also Greg will never do that.

To cut designer heads is not our dream...just to publish real words....all we need is to check is:

"Dx amplifier, even beeing simple, and also cheap, can be compared to expensive and famous without be ashamed...can even lost...but never by a big difference"

This is the idea...to respect all others, as they are very good units, made by respectable folks and I did not made an amplifier to be candidate to forum bad guy, to be the Bandit.... the opposite, my real dream is to see all bad guys banished from this nice forum.

All them forming a strip, not a long one, as they are not too many...and having in their hands one way ticket to hell.

regards,

Carlos
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 2nd May 2007, 06:16 PM   #1118
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
How important is hFE on drivers? I think my tip42s are fake...

Will order replacements from RS components to double check, but all mine measure hFE several times higer than max in datasheet.
  Reply With Quote
Old 2nd May 2007, 06:22 PM   #1119
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Not too much sensitive to those hfe differences.

But of course, the amplifier will work better ballanced if complementary ones (drivers and output) are matched in gain.

Of course differential is the most sensitive to gain unballances.

Voltage amplifier needs the highest possible gain...select them by gain to the voltage amplifier position.

PNP transistors use to have bigger gain related NPN.....i have some TIP42 with 142 of gain...and also some TIP41 with only 70.

Off course this is not good...but i have tested them, and sounded nice anyway...do not ask me how this could happens because i cannot tell you the reasons of that.

regards,

Carlos
__________________
This Sunday assemble a toy amplifier....a good fun to your weekend; https://www.youtube.com/watch?v=yk0qvkwsAOY
  Reply With Quote
Old 3rd May 2007, 08:02 AM   #1120
diyAudio Member
 
Graham Maynard's Avatar
 
Join Date: Dec 2003
Location: UK
Hi Nordic,

High gain at low current is a characteristic of TIP devices.

Cheers ...... Graham.
  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



New To Site? Need Help?

All times are GMT. The time now is 07:15 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