Post your Solid State pics here. - Page 256 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 29th June 2012, 05:51 PM   #2551
osscar is online now osscar  Latvia
diyAudio Member
 
osscar's Avatar
 
Join Date: May 2009
Location: Riga, LV
well done Professor - nice wooden enclosure!

My JLH boards is still waiting when i solder them
__________________
If time is money then I'm out of time
  Reply With Quote
Old 30th June 2012, 05:20 AM   #2552
amc184 is offline amc184  New Zealand
diyAudio Member
 
amc184's Avatar
 
Join Date: May 2007
Location: Christchurch
My new phono preamplifier design. The case and controller PCB (the one at the front) are temporary while I finish the design.
Attached Images
File Type: jpg APP front quarter.jpg (170.0 KB, 1288 views)
File Type: jpg APP rear quarter.jpg (171.9 KB, 1241 views)
File Type: jpg APP signal PCB.jpg (206.6 KB, 1217 views)
File Type: jpg APP power PCB.jpg (179.5 KB, 1157 views)
File Type: jpg APP top.jpg (182.2 KB, 1077 views)
__________________
Inside Classic Audio, my blog on repairs, modifications and anything else to do with audio.
  Reply With Quote
Old 30th June 2012, 06:58 AM   #2553
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by kees52 View Post
here the sound, as a idea, youtube is not so well sounding........
thanks
best sound clip yet
but pics of amp not so good
  Reply With Quote
Old 30th June 2012, 08:08 AM   #2554
rfj5106 is offline rfj5106  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Richmond, B.C CANADA
Hello amc184. That is the most complicated phono section I have ever seen. Any chance you could explain what is going on in each board and what design philosophy you were using?
__________________
Richard Jenkins
  Reply With Quote
Old 30th June 2012, 09:56 AM   #2555
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by tinitus View Post
best sound clip yet
the sound reminds me, you have shown it before
reminded by the sound of a you tube clip
hehe, thats kind of funny
  Reply With Quote
Old 30th June 2012, 10:06 AM   #2556
amc184 is offline amc184  New Zealand
diyAudio Member
 
amc184's Avatar
 
Join Date: May 2007
Location: Christchurch
The two stacked boards at the rear are the signal PCBs, each is one channel and has an MC amp, an EQ amp and a positive and a negative discrete regulator. The EQ stage has an adjustable filter, and can equalise LPs using the RIAA, AES, FFRR and NAB curves. Four of the reed relays are used to switch the filter, the other three select or bypass the MC stage. The 8-way DIP switch selects the cartridge loading and gain. The MC amp uses a LT1115, the EQ stage uses an OPA134 and BUF634 (I might change the OPA134).

The middle board is the power supply, and outputs four isolated 0-21VDC rails. They're connected on the signal boards to provide an isolated +/- 21VDC supply for each.

When finished, there will be a control PCB and a switch / display PCB at the front with an independent transformer and supply based on an Arduino Nano. I've not finished it though, so at the moment there's just a DIP switch, a regulator and a 9V battery to allow me to power the relays.

It sounds really good, especially with Deutsche Grammophon LPs using the AES curve. I gave it a good test last weekend using a Pro-Ject RPM9 with an Ortofon MC Rohmann cartridge.
__________________
Inside Classic Audio, my blog on repairs, modifications and anything else to do with audio.
  Reply With Quote
Old 30th June 2012, 03:29 PM   #2557
diyAudio Member
 
Join Date: Feb 2008
AMC184 thats an excellent job you have made of that phono

Did you design and build the PCBs yourself?

Alan
  Reply With Quote
Old 30th June 2012, 09:40 PM   #2558
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by amc184 View Post
My new phono preamplifier design. The case and controller PCB (the one at the front) are temporary while I finish the design.
Excellent! Looks great. It's obvious the attention to detail paid to your build. I'm sure it sounds as great as it looks.
  Reply With Quote
Old 30th June 2012, 10:01 PM   #2559
diyAudio Member
 
Join Date: Mar 2010
Location: Santiago, RS/ Brasil
Send a message via MSN to smartx21 Send a message via Skype™ to smartx21
Quote:
Originally Posted by tinitus View Post
best sound clip yet
but pics of amp not so good
Quality of pics doesn't matter!
Indeed, a very impressive sound!
Congrats, Kees!
__________________
Regards,
Andres
  Reply With Quote
Old 30th June 2012, 11:23 PM   #2560
amc184 is offline amc184  New Zealand
diyAudio Member
 
amc184's Avatar
 
Join Date: May 2007
Location: Christchurch
Quote:
Did you design and build the PCBs yourself?
I did both the circuit and PCB design. I had the PCBs made by Seeed Studio ($65 for 10 each of all the PCBs in the photos) and assembled them myself. The case I had lasercut and bent by a local sheetmetal shop.
__________________
Inside Classic Audio, my blog on repairs, modifications and anything else to do with audio.
  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



New To Site? Need Help?

All times are GMT. The time now is 02:57 PM.


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