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.

Mini-Me phono preamp
Mini-Me phono preamp
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 24th September 2013, 09:56 AM   #11
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
I did some more measurements.
But i do not know with one is good according the noisefloor.
Graf 1 = -78db
Graf 2 = -97db

There is also a graf with harmonics.
2nd harmonic = -50db
3nd harmonic = -60db

Graf 1
Attached Images
File Type: jpg image.jpg (189.9 KB, 862 views)

Last edited by Koifarm; 24th September 2013 at 10:00 AM.
  Reply With Quote
Old 24th September 2013, 09:57 AM   #12
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
Graf 2
Attached Images
File Type: jpg image.jpg (193.5 KB, 810 views)
  Reply With Quote
Old 24th September 2013, 09:58 AM   #13
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
Harmonics
Attached Images
File Type: jpg image.jpg (201.6 KB, 781 views)
  Reply With Quote
Old 24th September 2013, 11:18 AM   #14
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
Here the specs according to the measurements at the MM stage,

Amplication = 350x
RIAA curve = +/- 0,5db
SNR = -78db
THD+N = 0,0135%
Channel separation = 47,3db

Total cost for the project, about 100,-.

Next i will test the MC pre-pre.
  Reply With Quote
Old 25th September 2013, 09:19 AM   #15
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
I'm waiting your test the MC pre-pre.
  Reply With Quote
Old 25th September 2013, 01:23 PM   #16
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
Today i build one MC stage for testing purpose.
I discovered a fault in the PCB at the MC pre input, i shall correct that a.s.a.p.

I am very happy about the 6N16 tube. This tube has in the MC pre very little hiss, no humm, very little microphonics.

Here the specs i measured for the compleet Mini-Me with MC pre-pre.

Measurements with 100 Ohm at the input.

Amplication = 3000x
RiAA curve = +/- 0.5db
SNR = -77db
THD+N = 0.0244%
Channel separation = 47db

I did not use the Zener in the MC pre because there was no humm at all. I shall modify the schematic a.s.a.p.. For the heatersupply i used an extra LM7806.

I am very pleased
Attached Images
File Type: jpg image.jpg (271.5 KB, 803 views)
  Reply With Quote
Old 25th September 2013, 04:40 PM   #17
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
All schematic and PCB design are up to date ( As build).
  Reply With Quote
Old 25th September 2013, 04:58 PM   #18
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Where is the last MC schematic?
  Reply With Quote
Old 25th September 2013, 05:11 PM   #19
Koifarm is offline Koifarm  Netherlands
diyAudio Member
 
Koifarm's Avatar
 
Join Date: Aug 2005
It is in the thread start, the first reply.
Just use the refresh button in your browser.

Ronny
  Reply With Quote
Old 25th September 2013, 05:15 PM   #20
merlin el mago is offline merlin el mago
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
OK thank you Ronny.

Cheers
Felipe
  Reply With Quote

Reply


Mini-Me phono preampHide 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
Phono Preamp PCB wanted - Transcendental Sound Grounded Grid Phono Preamp nathanjh13 Analogue Source 0 14th June 2012 10:19 AM
6112 and 6111 Mini-preamp TV7 Tubes / Valves 25 22nd December 2011 10:58 PM
FS: Mini headamp/preamp/buffer boards theAnonymous1 Swap Meet 1 26th November 2008 12:39 AM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 07:32 AM


New To Site? Need Help?

All times are GMT. The time now is 11:50 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