Douglas Self PreAmp 2012 - 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 14th March 2014, 11:12 AM   #1
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Default Douglas Self PreAmp 2012

Hi,

This is my first 'proper' posting on this forum. Apologies if this is in the wrong section.

Here's my latest build...

I'll post more photos as the build proceeds. Sorry about the blurriness - I'll post some better photos later.

Dave.
Attached Images
File Type: jpg IMG_20140313_210014.jpg (706.4 KB, 1115 views)
File Type: jpg IMG_20140313_210027.jpg (648.0 KB, 1043 views)
  Reply With Quote
Old 14th March 2014, 11:28 AM   #2
diyAudio Member
 
Join Date: May 2011
Location: Clifton, Maine
Nice! I like the chassis.

I have been studying this pre-amplifier with the possibility of building it. So I look forward to following your build.
  Reply With Quote
Old 14th March 2014, 11:32 AM   #3
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Default More info...

Hi,

Forgot to mention: I'm building this preamp for my father-in-law who is Chinese, so all the engravings have to be in Chinese. I am using Front Panel Designer to do the panels and I am trying to achieve a screwless look. The tiny toggle switch on the front panel is the tone defeat and I re-made the rotary switch PCB to introduce some cool lighting effects. The long acrylic panel show the control ledgends. The knobs will have illumination around them. The red LLLL LED is not lit - it's just the desk light illuminating it from behind

Dave.
Attached Images
File Type: jpg IMG_20140313_210104.jpg (500.8 KB, 941 views)
File Type: jpg IMG_20140313_210113.jpg (669.7 KB, 854 views)
  Reply With Quote
Old 14th March 2014, 11:34 AM   #4
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Quote:
Originally Posted by dennismiller55 View Post
Nice! I like the chassis.

I have been studying this pre-amplifier with the possibility of building it. So I look forward to following your build.
Hi Dennis,

I'm quite happy to explain further how the chassis goes together. But, be warned - it's expensive. The panels you see in these photos cost about €700!

Dave.
  Reply With Quote
Old 14th March 2014, 12:13 PM   #5
Mooly is online now Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
That's very nice

(I've moved this to the line level forum as it seems more appropriate)
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced. Click here to take the low impedance challenge
  Reply With Quote
Old 14th March 2014, 12:43 PM   #6
diyAudio Member
 
Join Date: May 2011
Location: Clifton, Maine
Quote:
Originally Posted by HeliMan View Post
Hi Dennis,

But, be warned - it's expensive. The panels you see in these photos cost about €700!

Dave.
Wow! That is expensive. Fortunately, I am thinking of a DIY chassis. It really is the internals that has my focus. I have bought the 3 part online Elector articles. I also have the last edition of the authors book. The cost of the PCB's seem reasonable.

I find following others projects gives me confidence and motivation. Thanks for posting this.
  Reply With Quote
Old 14th March 2014, 12:51 PM   #7
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Quote:
Originally Posted by dennismiller55 View Post
Wow! That is expensive. Fortunately, I am thinking of a DIY chassis. It really is the internals that has my focus. I have bought the 3 part online Elector articles. I also have the last edition of the authors book. The cost of the PCB's seem reasonable.

I find following others projects gives me confidence and motivation. Thanks for posting this.
If you'd like, I have made the rotary switch PCB better - the switch alingment now makes sense and I added provision for LED illumination for each selection. All selections will light, but the selected one will be brighter. (Tried it out on breadboard, I haven't powered the real thing yet ). I have the gerber files for the new PCB...

I will post more photos this weekend as I have to disassemble the amp to do some fine filing - ha ha!

Dave.
  Reply With Quote
Old 17th March 2014, 12:15 PM   #8
HeliMan is offline HeliMan  United Kingdom
diyAudio Member
 
HeliMan's Avatar
 
Join Date: Sep 2013
Location: Somerset, UK
Default PCBs

Hi,

Here are the photos I promised (I will have to load them slowly across more posts)...

I started the build back in September last year with the boards from Elektor and decided on a layout. It took some time to populate the boards and design the panels.

More to come...
Attached Images
File Type: jpg 006 Initial Layout.JPG (737.5 KB, 729 views)
File Type: jpg 018 Phono PCB.JPG (701.4 KB, 348 views)
File Type: jpg 023 Phono PCB Resistors.JPG (698.2 KB, 311 views)
File Type: jpg 026 Phono PCB Soldering.JPG (770.2 KB, 214 views)
File Type: jpg 029 Line-In PCB Pots.JPG (672.8 KB, 261 views)
File Type: jpg 028 Line-In PCB Close-Up.JPG (670.3 KB, 272 views)
File Type: jpg 030 Line-In PCB.JPG (654.6 KB, 240 views)
File Type: jpg 031 Re-Designed Rotary Switch PCB.JPG (797.3 KB, 257 views)
  Reply With Quote
Old 17th March 2014, 12:40 PM   #9
Bonsai is offline Bonsai  Taiwan
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Taipei, Taiwan
Very nice indeed!

I've got to finish my line preamp off - just the housing to do now!

Great piece of work - thanks for sharing.
__________________
bonsai
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote
Old 17th March 2014, 12:48 PM   #10
diyAudio Member
 
Join Date: Aug 2012
Location: Northern Kentucky
Your build is a work of art! I built this when it first appeared in Elektor and was very impressed. (got me hooked on DIY audio) I was a bit surprised though, that more people did build this as it is a first rate piece of equipment.

Me
__________________
Used, abused, and confused husband of....
  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
Elektor Preamp 2012 (Douglas Self) Mini, low budget borderman Solid State 21 7th June 2013 08:52 PM
SEC DIY 2012 Speaker Show - Mobile, AL - November 10th, 2012 Tieftoener Clubs & Events 2 7th November 2012 10:56 PM
New Douglas Self Book blmn Solid State 7 22nd July 2009 06:00 PM
Douglas wavewinder Cloth Ears Parts 1 9th March 2008 08:20 PM


New To Site? Need Help?

All times are GMT. The time now is 09:57 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