Mpp - Page 760 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

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

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 14th October 2012, 03:36 PM   #7591
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I have some autistic tendencies.
  Reply With Quote
Old 14th October 2012, 04:42 PM   #7592
pdul is offline pdul  Denmark
diyAudio Member
 
Join Date: Jan 2009
Location: Copenhagen
.
  Reply With Quote
Old 14th October 2012, 11:30 PM   #7593
diyAudio Member
 
Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917
I have some Suicidal Tendencies.
__________________
hoping to pick up some things.
  Reply With Quote
Old 14th October 2012, 11:41 PM   #7594
brianco is offline brianco  Ireland
diyAudio Member
 
brianco's Avatar
 
Join Date: Aug 2005
Location: Scottish Borders - Kelso; on the famous Tweed River!
Quote:
Originally Posted by Joachim Gerhard View Post
I have some autistic tendencies.
What surprises me is that you do not have murderous tendencies!
  Reply With Quote
Old 14th October 2012, 11:52 PM   #7595
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
That surprises me too but i feel piece full inside.
  Reply With Quote
Old 15th October 2012, 03:51 AM   #7596
diyAudio Member
 
Stefanoo's Avatar
 
Join Date: Apr 2006
Location: italia - ora USA -WI
Quote:
Originally Posted by RCruz View Post
The values I got from simulating helped by my riaa calculator (spreadsheet).

There are variables that I am not totally sure about and that I believe can be different from build to build... Namely first stage output impedance and buffer input impedance.

So it is difficult to predict "exact values", but mine are very near yours.
I always measure the components and do adjustments to reach a "probable" precision.

I mainly use a listening panel to evaluate the results and compare with other builds.

Anyway, based on the reports from other builders that used "stock" riaa and caps values, it sounds very good also so I believe it might be system dependent.

Regarding the EL caps, after discussing the subject with JG, I used lower values because I did not have the indicated values, so I do not have the means to compare... but in my case it works wonderfully.... Paradise bass is outstanding IMO.

I am really glad this turned out to be a very flexible design that responds well to tuning.... We will learn a lot from the numerous builders subjective input to come soon
so the graph was from simulation.
Anyhow, like I said the bass with a lower elcap won't loose any grip as you are experiencing, but, the mid and high will be much more transparent.
I am glad you like it so far.
Also, the precision I gave along with the values I suggested is actually extracted by bench measurements.
Therefore using the values I quoted will yeald to a very, very tight precision and I am glad because this matches really close simulation.

Yes, design respondes pretty well to tweaking like I anticipated.
The biggest improvement will come from the custom teflon caps for the RIAA but it's too early to talk about this.

enjoy your build and thanks Joachim for this slick design.
__________________
Stefano
  Reply With Quote
Old 18th October 2012, 09:44 PM   #7597
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Hi. I think there may be an error in the Regulator R3 schematic. See the included schematics. In the R3 version schematic the +Side of C103/C203 is connected to the VPLUS/VMINUS line on top (circled in red). In the previous R1 and R2 version of the schematic, the same capacitor is connected to R105/R205 to act as a filter for the led bank voltage reference. It think this is the correct way of connecting C103/C203 but I may be wrong.

Which schematic is the correct one?
Attached Images
File Type: jpg Reg_R2_Detail.jpg (26.9 KB, 300 views)
File Type: jpg Reg_R3_Detail.jpg (20.2 KB, 272 views)
  Reply With Quote
Old 18th October 2012, 10:11 PM   #7598
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Hesener has the official schematic so he should commend here.
  Reply With Quote
Old 19th October 2012, 10:33 AM   #7599
hesener is offline hesener  Germany
diyAudio Member
 
Join Date: Mar 2005
Location: Munich, Germany
Thanks for spotting this, I reviewed the versions and we decided to change this connection to VPLUS/VMINUS in version 2. So version 2 and also version 3 have the caps connected there, only version 1 had it connected at the resistor / LED junction.

Everything OK.....
  Reply With Quote
Old 19th October 2012, 08:30 PM   #7600
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Thanks. But my PCB is wrong then I'll do a quick mods
  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 03:10 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