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.

LC Audio Dual Mono RIAA - Light MC Headamp
LC Audio Dual Mono RIAA - Light MC Headamp
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 16th April 2012, 12:52 AM   #11
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
It is worth putting it into a nice enclosure, with separate power supply for even lower noise.
Look at it in the night, gorgeous sight with all these lights. Just singing
Attached Images
File Type: jpg Proto_in_the_night.JPG (111.4 KB, 565 views)
  Reply With Quote
Old 17th April 2012, 12:07 AM   #12
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
Anyone knows these kind of smd resistors? They are the same kind as used into the original LC Phono. Thanks.
Attached Images
File Type: jpg Resistor.jpg (6.2 KB, 565 views)
  Reply With Quote
Old 17th April 2012, 12:36 AM   #13
srh is offline srh  New Zealand
diyAudio Member
 
Join Date: Mar 2004
Location: Whangarei. NZ
LC Audio Dual Mono RIAA - Light MC Headamp
Hi Algar_emi, The resistors are known as MELF.
Regards,
Steve.
__________________
The older I get, the more simplicity appeals.
  Reply With Quote
Old 17th April 2012, 12:45 AM   #14
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: Northern Iliinois
LC Audio Dual Mono RIAA - Light MC Headamp
algar_emi:

that's beautiful work! i always liked that design with the clever use of the AD844.
nice to hear that it sounds good, too!

mlloyd1
  Reply With Quote
Old 17th April 2012, 11:08 PM   #15
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
Thanks for the resistor info. Do you think they are carbon resistor, or MELF is merely a SMD format? Tx
  Reply With Quote
Old 17th April 2012, 11:14 PM   #16
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
go to distrelec there you finf vishay metal film melf they are never carbon
  Reply With Quote
Old 17th April 2012, 11:16 PM   #17
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
This are 1W. they come in lower wattage too.https://www.distrelec.de:443/metallf...mmb0207/710057
  Reply With Quote
Old 18th April 2012, 01:29 AM   #18
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
I guest Distrelec doesn't sell to North America. Too bad I would I like to try the same type of resistor as LC uses.
  Reply With Quote
Old 31st August 2012, 11:21 PM   #19
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
Hi. I thought I'll share with you step by step how it is a lot of work to build an enclosure for your project. I know that for me that the longest step of any project. I love my LC Audio phono preamp that I decided to install it into a nice enclosure.

As some of you may know I try to recycle old enclosures when I can. In this case it is a satellite TV received that had been collecting dust for so years now.

What is nice about commercial or industrial enclosures is that they are well built, even the cheap commercial ones. They are a strong, squared (important when trying to align metal parts), well designed, and well finished, all for free. With a little work (well a lot...) they can make the foundation of a nice enclosure.

The one I choose had a ventilated top, all steel construction (important for phono preamp shielding) and was just the right size. It has a switching power supply already mounted. I removed it, studied the circuit, cut the board, removed the unneeded parts and modified it to suit my needs. This way I was able to keep the AC entry connector and nice PCB fit. I also modified the bottom, removed the unneeded pcb standoff, and keep the ones I can reused. What is also great about the particular enclosure is that I can remove the rear panel with just two screws.

The top panel fits into a plastic front panel. I discarded the cheap front panel since I was planning the replace it with a nice brushed aluminum one. I had to cut some of the top metal tongue that inserts into the plastic front. The top is steel but still pretty thin, so I could still use my none ferrous bench saw blade using cutting oil. Check the picture, the end result is not bad.
Attached Images
File Type: jpg 1.jpg (116.0 KB, 463 views)
File Type: jpg 2.jpg (83.2 KB, 409 views)

Last edited by Algar_emi; 31st August 2012 at 11:23 PM.
  Reply With Quote
Old 31st August 2012, 11:31 PM   #20
Algar_emi is offline Algar_emi  Canada
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
LC Audio Dual Mono RIAA - Light MC Headamp
One good way of mounting PCB and parts is to use a sub plate mounted on the bottom with just a few screws. This way you spare the bottom of numerous holes and screw heads. It makes for an easier assembly job too. I like it in particular with a used enclosure. The sub plate matches the weird original mounting pattern then you can mount your own parts where you need it. I installed all my standoff for the PCB on the sub plate. As you can see this is a lot of drilled holes.

Since it is a phono preamp, I planned to have the ac power section shielded from the sensitive phono section. In order to do so I'll have all the big power transformers separated by a steel dividing wall (see in the middle of the case). The further increase the shielding I put mu-metal plate on the transformer sides. This mu-metal, self-adhesive material from 3M is just great. It is used in my Air Tight preamp as well. I know that a separate power supply is even better for noise rejection, but I hate all those little supplies that I have in my racks. If I can have all the parts in one enclosure I'll do it. This preamp was dead silent on the prototype with the transformers mounted close to the PCB. I expect no problem on the final product. We'll see.
Attached Images
File Type: jpg 3.jpg (119.9 KB, 392 views)
File Type: jpg 4.jpg (118.8 KB, 70 views)
  Reply With Quote

Reply


LC Audio Dual Mono RIAA - Light MC HeadampHide 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
Leach MC Headamp tmblack Analogue Source 25 3rd June 2015 06:36 AM
Audio-gd C-39MK3 fully balanced dual mono pre-amp Electro3000 Swap Meet 0 9th March 2011 02:45 PM
Rossiter Headamp for MC Cartridges pozo1992 Analogue Source 9 4th February 2008 11:25 AM
MC headamp with opa PTSOUNDLAB Analog Line Level 1 11th January 2008 09:56 PM
LC Clock XO II from LC-Audio ManUtd Swap Meet 11 6th October 2003 01:47 PM


New To Site? Need Help?

All times are GMT. The time now is 01:39 AM.


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