Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

AKSA Builders of market proven kits and modules at sound quality to rival the best in high end

Reply
 
Thread Tools Search this Thread
Old 25th November 2009, 09:34 PM   #1031
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Many thanks, HM,

I have followed JLH for more years than I am prepared to admit. I remember first hearing his 1969 10W Class A in 1971, a good friend, now an accomplished engineer, built it into a small shoebox, and I vividly recall Paul Desmond playing 'Summertime' through it. It was largely responsible for drawing me into high end, to be frank, and I enjoy his writing style.

I will read this article immediately, thank you!

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 25th November 2009, 09:56 PM   #1032
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
Aspen Headphone Amp
Thanks - I haven't seen this one before. I do like reading his articles. I'm working on a JLH variant as part of my current DIY design activities and always marvel at how we reinvent what has gone before and already been done so well.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 26th November 2009, 06:17 AM   #1033
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Okay, I've trying to figure out how much power a 1mW/100db transducer would need.

Even 1mW produces hearing damage, but what we want is somewhere around 60db, about as loud as normal speech. That would be less than 1mW.

1V into 60 ohms gives 16mW, more than we will ever need, unless I'm wrong. Do we really need to be able to push 150mA on demand?

And is the relationship between mW and db linear? As in, to get 60db do we simply put in .6mW?

- keantoken
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 26th November 2009, 09:06 AM   #1034
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Kean,

The 122mA chosen is largely the result of wanting to throw power into high and low z cans, from 24R all the way up to 2K.

If you do the sums on 2K phones, you have 1Vrms (2.828Vpp, or 1.414Vp) producing just 0.5mW of power, which would be 97dBA if they are 100dB/watt.

OTOH, for 24R headphones, 1Vrms would give us 20.8mW of power with a 10R series resistor as per convention. This would be 109dBA (unless my math is wrong).

As you can see, we have wild, carefree overkill here...... a nicely over-engineered component which should keep deaf trolls into heavy metal for centuries....

And you call yourself American, let alone a TEXAN, where EVERYTHING IS BIG???

Hunker down, buddy, y'all......

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 27th November 2009, 01:32 AM   #1035
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
I was about to suggest using the JLH output stage when I realized that then we'd have a carbon copy of the JLH itself...

- keantoken
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 27th November 2009, 01:35 AM   #1036
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
Aspen Headphone Amp
Quote:
Originally Posted by keantoken View Post
I was about to suggest using the JLH output stage when I realized that then we'd have a carbon copy of the JLH itself...

- keantoken
The JLH is a very elegant design isn't it. I'm in the process of building one. But it wouldn't be a HAKSA....
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 8th December 2009, 09:27 PM   #1037
kimbo is offline kimbo  Australia
diyAudio Member
 
kimbo's Avatar
 
Join Date: Mar 2004
Location: Melbourne
Hi Guys,

it's been pretty quiet in this post for the last couple of weeks.
Has anybody gotten around to breadboarding a version yet......or are we all spooked by that runaway train called Christmas that is rushing towards us (I am!)

How's the JHL going Bigun?
Cheers, Kim
  Reply With Quote
Old 9th December 2009, 05:12 AM   #1038
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Quiet, not dead however, and yes, Xmas is spooking us all.......

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 9th December 2009, 12:14 PM   #1039
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
Aspen Headphone Amp
Don't worry HAKSA is alive and well, but now that the design is 'done' there will be a quiet time whilst the board gets sorted out and I know Hugh is very busy.

The JLH hasn't started yet, I won't have time til after Christmas. But I've now simulated it to get a better feel for how it works.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 23rd August 2010, 08:22 PM   #1040
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Aspen Headphone Amp
Anything?
__________________
/Per-Anders (my first name) or P-A as my friends call me.
My group buys Super Regulator group buy. 39 pcb's in interest. DCT03 group buy. 32 pcb's in interest.
  Reply With Quote

Reply


Aspen Headphone AmpHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another DAC + Headphone amp ghetto Digital Source 14 10th July 2008 04:02 PM
ESL Headphone X-former bjackson Planars & Exotics 5 19th September 2005 03:45 AM
Headphone amp audioPT Headphone Systems 5 28th September 2004 08:03 PM
Zen v4 headphone amp Rob M Headphone Systems 11 21st May 2003 12:58 AM
Aspen Amplifiers - the ASKA 100 WATT griff Solid State 25 13th April 2002 03:15 PM


New To Site? Need Help?

All times are GMT. The time now is 08:42 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki