Mpp - Page 352 - 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 13th December 2011, 07:04 PM   #3511
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
I have adjusted the gain wit a fixed resistor to 55 dB...

The input voltage is 1 mV. Which is more than most high-end cartridges put out...frequency is 1k KHz.
  Reply With Quote
Old 13th December 2011, 07:04 PM   #3512
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Frans, Michael was asking about a PSU but you have already posted it i think. When you see the latest circuit would you make any adjustments ? Anyway, could you please post your solution again please ?
  Reply With Quote
Old 13th December 2011, 07:04 PM   #3513
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
Frans I better get in on the buy as well....
  Reply With Quote
Old 13th December 2011, 07:07 PM   #3514
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I would prefer 60dB. My Titan i gives out 0,5mV 5cm sec so we have 0,5V out. That is even not enough for some Ortofons and others.
  Reply With Quote
Old 13th December 2011, 07:11 PM   #3515
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
I'll adjust the RIAA values to fit that, We lost 4-5 dB's in the degeration of the input...
a little scaling will do.....

M
  Reply With Quote
Old 13th December 2011, 07:11 PM   #3516
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by Joachim Gerhard View Post
Have you already simulated that whole schebang ?
I think Frans is our PSU man and he has drawn up something before.
Please Frans, jump in if you like when your read this.
Still working on the final version (there is a (small) one wire change). I will publish in the next hour.

About the servo, normally I would use a somewhat bigger capacitor (1u poly) and smaller resistors 1Meg or even 100K. My opamp of choice for servos is the OPA134 (like D.Self )
  Reply With Quote
Old 13th December 2011, 07:12 PM   #3517
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I use the OPA134 too. No problem with sound or function and easy to get.
  Reply With Quote
Old 13th December 2011, 07:17 PM   #3518
MiiB is offline MiiB  Denmark
diyAudio Member
 
Join Date: May 2005
Location: Denmark
the cap is 1u and the input resistor is 1 Meg and the output is 2x2meg in parallel..
  Reply With Quote
Old 13th December 2011, 07:18 PM   #3519
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Sorry Joachim one small change to make, the capacitor that was placed between the transistor base and ground has been moved to (between) transistor base and output. This gives a much improved load response.

Attached are may (currently final) research and power supply schemas with annotations. Also attached are the LTspice source files. Next thing for me (is build the real thing).

There are a positive and a negative supply and one variation that uses (almost) the same components for the negative supply as for the positive.

Also note that BC327 and BC337 transistors can be used to replace the BC550 and BC560.

And finaly, if you want more than 100 mA you should replace the single transistor (in the gyrator) with a Sziklai pair having a Rcb of about 100 Ohm. (more usage for your BC327 and BC337 transistors).
Attached Images
File Type: jpg Shunt Vreg PSRR.JPG (301.7 KB, 205 views)
File Type: jpg Shunt Vreg 24V.JPG (351.7 KB, 196 views)
Attached Files
File Type: txt Shunt Vreg PSRR.asc.txt (8.2 KB, 15 views)
File Type: txt Shunt Vreg 24V.asc.txt (22.4 KB, 12 views)
  Reply With Quote
Old 13th December 2011, 07:20 PM   #3520
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Sure, Michael. You gain in lower distortion and you loose in gain. That`s life.
  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 01:08 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