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

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Mpp
Mpp
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 30th December 2011, 02:35 PM   #3981
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Yes, Martina was the beta tester on many incarnations. Martina has very good technical knowledge of mechanical things. She has repaired my coffee machine, my telephone, debugged my computer, repaired my car and other things. It is only when it comes to electronics she can not follow each and every little detail but i think that is a blessing because she it not very biased in terms of topology. When it does not sound right to her she does not care about the underlying technology ( she cares actually, but i hope you understand what i mean). Martina has also a different way to listen to audio. For example Martina loves classical music and especially older recordings that are sometimes hard to reproduce. Instead of judging the technical excellence she compares the sound of reproduction to the sound of real life music.
She is an expert on the human voice and there was in the beginning where i failed. At first i simply restored to the old garbage in garbage out argument but then we found that the sound of voices can be improved by improving the phono stages. And so it goes..
  Reply With Quote
Old 30th December 2011, 02:51 PM   #3982
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Mpp
The BBC heritage of getting the voice right first had serious basis.
  Reply With Quote
Old 30th December 2011, 03:14 PM   #3983
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Sure, i worked at Essex University in the early 90th so i got a fair dose of that good poison. Actually the Pro AC Tablette was the speaker that impressed me so much that i founded Audio Physic. I fantasized when something so small can make so much music there must be a customer potential, and i was right.
  Reply With Quote
Old 30th December 2011, 04:26 PM   #3984
Audiofanatic is offline Audiofanatic  Netherlands
diyAudio Member
 
Audiofanatic's Avatar
 
Join Date: Oct 2002
Location: The Netherlands, Utrecht
Default Martina Danke !

Hi Martina & Joachim,

Now I understand why Joachim is so good in making music sound at it's best through his equipments; he fine tunes his products via Martina's ears
Well I actually do the same thing here, I ask my sweet partner to judge my work and if it's OK she will smile and close her eyes and keep on listening.

Danke Martina, danke Joachim and thanks to all of you who helped to make this thread a big success ! Happy new year to you all.


atb,


José

Audiofanatic
__________________
Be nice to animals.
  Reply With Quote
Old 30th December 2011, 05:00 PM   #3985
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
No cheaten, no eaten

Comander Crichton, Farscape
  Reply With Quote
Old 30th December 2011, 05:02 PM   #3986
Audiofanatic is offline Audiofanatic  Netherlands
diyAudio Member
 
Audiofanatic's Avatar
 
Join Date: Oct 2002
Location: The Netherlands, Utrecht
Default Mr G.




Audiofanatic
__________________
Be nice to animals.
  Reply With Quote
Old 30th December 2011, 08:49 PM   #3987
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Mpp
sorry I was offline a few days.... layout is proceeding, on the ground planes in the amplifier section now...

happy new year to everybody!
(repeating the nice and very true comments about this thread seem boring at this point, but I fully second...)
  Reply With Quote
Old 30th December 2011, 08:53 PM   #3988
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Mpp
Default Needs some explanation, I think.

Someone, in a private mail, called the Sziklai pair and capacitor in front of the LM317 current source an capacitor multiplier , and that it is not!

Actually the arrangement is a constant voltage source that supplies the current source, and the reference voltage for this voltage source is the output voltage of the shunt regulator.

This way the voltage supplied to the current source is as stable (about) as the voltage supplied by the shunt, and that voltage is very stable.

In effect this arrangement ‘degrades’ the LM317 to be a ‘mime’ of a resistor, the amount of work it has to do is minimal and the quality of the component is of minimal influence on the quality of the regulator.

Attached an comparison with a ‘standard’ shunt regulator and an enhanced version of the standard shunt regulator.

Anyway I hope you like it.
Attached Images
File Type: jpg VReg compared with standaard shunt.JPG (259.7 KB, 261 views)
  Reply With Quote
Old 30th December 2011, 09:17 PM   #3989
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Hello Hesener. Welcome back. I know you are busy.
Frans, thanks for clarifying this.
I asume that the red trace is yours or is it the green trace that has somewhat better hum rejection ?
  Reply With Quote
Old 30th December 2011, 09:23 PM   #3990
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
The standard solution with TL431 can be somewhat improved with 220uF over R3.
  Reply With Quote

Reply


MppHide 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


New To Site? Need Help?

All times are GMT. The time now is 01:20 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki