Lt115 Based Phono Amp (With Pics!!!) - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, 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 21st May 2007, 03:09 PM   #1
diyAudio Member
 
Join Date: Jun 2006
Default Lt115 Based Phono Amp (With Pics!!!)

Hi,

Just completed my very first MC based phono amp. Am very new at this thus just "copied" the design as shown in the Linear Technology datasheet. I am using the Denon DL-103 with the phono amp

To my surprise, it sounds pretty decent! The guitars and mids on the records just sounds so much better!

I have attached some pictures for all your comments, please. Any suggestions to further improved the design would be greatly appreciated.

Thanks,
Stevie

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 19th October 2008, 02:36 PM   #2
diyAudio Member
 
Join Date: Jun 2006
Thought I post an update on what I have been doing since the very 1st post...way overdue man...

Basically, I decide to power the design from lithium batteries and thus built a custom lithium battery charger system. Some general information as follows:

1. I use 2 x 4 cell pack lithium battery pack to provide +/- 15Volts
2. A customise battery charger system with micro chip controller to controll the charging process.

Listening conclusion is that the amp is very quiet and clean. Sometimes too clean for the LPs...hearing too much "unwanted" elements on very old records!

Her are some pictures. Enjoy!



Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 20th October 2008, 02:18 AM   #3
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Looks very nice, well done. I was going to build this phono stage but then decided to try the elcheapo and ended up doing both the old and the new version. I found the given schematic sort of cold, clinical, and the highs a bit too edgy so I added a mosfet buffer. What's your impression about the tonal quality of your preamp?

BTW, did you have the pcb professionally made? They look nice.

I'm torn now between designing a balanced input phono stage based on the ina630 or a tube based one.
  Reply With Quote
Old 20th October 2008, 02:54 PM   #4
diyAudio Member
 
Join Date: Jun 2006
Thanks. It was really fun building the amp.

"Clean, Quiet and Fast" would be how I would describe the tonal quality. It would bring out the worst if your LP or turn table are not up to scratch. You can heard literally "everything". It is that "clean".

The imaging is also very good. Using decent components, the left right response and phase are literally identical, as far as measurement are concern, as validated by listening test.

So I guess the sound depends very much on the entire setup and the individual. My uncle did not like it because it was just too "clean" for his liking. He reckon that the tone would be much better (to his liking), if it was matched to tube amplifiers.

The PCBs are indeed professionally made.

Go for balanced tube based design. It would be a blast to design and built.
  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
Decoupling for OPA627, LT115 and AD8610 Sheriff Solid State 22 22nd February 2012 06:58 PM
2nd LM4780 BASED AMP COMPLETED-PICS* Dominick22 Chip Amps 15 15th July 2006 11:22 PM
Transformer based phono stage biovizier Solid State 7 31st October 2005 09:12 PM
Pearl Phono up and running (pics) nate Pass Labs 29 23rd June 2005 07:57 PM
PICS: GainClone Monoblock pics Rarkov Chip Amps 19 17th April 2003 07:37 AM


New To Site? Need Help?

All times are GMT. The time now is 10:57 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