OPENAMP1 - MM phono preamp open project - Page 14 - 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 10th August 2013, 08:10 PM   #131
nezbleu is offline nezbleu  Canada
diyAudio Member
 
nezbleu's Avatar
 
Join Date: Dec 2009
Location: Halifax, Nova Scotia, Canada
Quote:
Originally Posted by PMA View Post
At what output current do you set your shunt regulator? Openamp board should consume about 70mA per rail.
Yes, this regulator could safely power 3 of those boards! Some folks say that when the shunt MOSFETs are passing a considerable amount of current, the output impedance is lower and it "sounds better". So I have the constant current source set at about 280mA per rail. The regulator circuit itself will consume a few tens of milliamps, I'm not sure how much. The rest is shunted to ground less whatever is used by the Openamp board. It runs a little warm, but not too bad. Certainly the Openamp isn't putting any strain on it!
  Reply With Quote
Old 11th August 2013, 05:55 PM   #132
PMA is offline PMA  Europe
Design engineer, consultant
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Default BOM, prices etc.

For those who are sending me requests to provide them with documentation, BOM, prices etc. - please consider that all this info is accessible from my webpage, Pavel Macura audiopage

Documentation and BOM is here:

Preamplifier for MM cartridge

prices:

http://web.telecom.cz/macura/pricelist.pdf

Thanks,
Pavel
__________________
Pavel Macura
http://web.telecom.cz/macura/audiopage.html
  Reply With Quote
Old 29th August 2013, 11:56 AM   #133
diyAudio Member
 
Benedetto's Avatar
 
Join Date: Nov 2007
Location: Knifetown-Germoney
Stupid question, but:
what does 1F CF3 mean ?

Thxalot
__________________
preregulatorpeterE-MAIL
  Reply With Quote
Old 29th August 2013, 12:18 PM   #134
PMA is offline PMA  Europe
Design engineer, consultant
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Labeling of this distributor:

CF3-1M0/J | GM electronic

You may use the caps as in the pdf attachment.
Attached Files
File Type: pdf Arcotronics r66.pdf (152.2 KB, 29 views)
__________________
Pavel Macura
http://web.telecom.cz/macura/audiopage.html
  Reply With Quote
Old 29th August 2013, 01:11 PM   #135
diyAudio Member
 
Benedetto's Avatar
 
Join Date: Nov 2007
Location: Knifetown-Germoney
Ok,
so it appears to be just a simple MKT.
thanx.
__________________
preregulatorpeterE-MAIL
  Reply With Quote
Old 29th August 2013, 01:18 PM   #136
PMA is offline PMA  Europe
Design engineer, consultant
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Quote:
Originally Posted by Benedetto View Post
so it appears to be just a simple MKT.
Exactly. Enough for DC servo.
__________________
Pavel Macura
http://web.telecom.cz/macura/audiopage.html
  Reply With Quote
Old 8th September 2013, 08:27 AM   #137
diyAudio Member
 
Join Date: Dec 2004
Hi Pavel, I had a quick look on the site and through the PDF but must have missed it, can you let me know the board dimensions please?
  Reply With Quote
Old 8th September 2013, 08:45 AM   #138
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
The boards measure 135mm x 100mm and are very good quality.

Last edited by Marra; 8th September 2013 at 09:08 AM. Reason: Added text
  Reply With Quote
Old 8th September 2013, 09:18 AM   #139
PMA is offline PMA  Europe
Design engineer, consultant
diyAudio Member
 
PMA's Avatar
 
Join Date: Apr 2002
Location: Prague
Hi all, sorry I probably have forgotten to mention board dimensions. They are 100 x 134 (135) mm. Thanks Marra for posting the information here.

The boards dimensions should be measurable from manual, page 9, if it is printed as 1 : 1 (no scale for printer).

Unfortunately, all boards are sold out at the moment. I hope to repeat the production and distribution sometimes in future, when I get some time to do it again.
__________________
Pavel Macura
http://web.telecom.cz/macura/audiopage.html
  Reply With Quote
Old 8th September 2013, 09:21 AM   #140
diyAudio Member
 
Join Date: Dec 2004
Ah that's a shame, thanks
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Best rbb transistor, for MM phono preamp claudio Solid State 27 31st January 2013 01:58 AM
MM phono preamp with accu and solarcells Koifarm Analogue Source 5 4th November 2012 10:32 AM
Swiss Physics model 5 preamp MM phono input Eric Tang Analogue Source 10 5th October 2010 02:53 PM
Phono preamp mm cartier20002000 Analogue Source 8 27th November 2007 04:17 AM
LT1028 mm phono preamp? miziq Analogue Source 9 27th April 2007 06:10 AM


New To Site? Need Help?

All times are GMT. The time now is 11:35 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