Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Isomagic w transformers in amplifier
Isomagic w transformers in amplifier
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
Thread Tools Search this Thread
Old 26th February 2008, 08:43 PM   #1
TomasF is offline TomasF  Sweden
diyAudio Member
Join Date: Apr 2006
Location: Stockholm
Default Isomagic w transformers in amplifier

my next project might give extrordinary results, please help me identify the pitfalls!

At home I run a modified Cambridge Isomagic (S700) feeding a power amplifier. Toslink. Clock Lock. Passive volume control.

My idea for next project is to integrate the Isomagic DAC board into the power amplifier. In the amplifier I have only DC (fed from separate box power supply) so there will not be much 50 Hz AC disturbing the DAC operation. I can in the amp easily obtain +5V that I need for Isomagic digital section (or keep todays solution with batteries). The DAC chip will feed into a Lundahl transformer (1:10 or so, I live near their factory) and connect to the volume control. Connection for digital in and Clock Lock would be optical directly into the power amp.

Two opamps less to travel.
No signal cable to travel.
One capacitor less to travel (Isomagic have after mod a lot DC on output).
No power supply needed to opamps (+-15 V supply weak spot in Isomagic)

What specifications do I need for the transformer?
Do I need a resistor to ground as some is using or do I just connect the transformer to two outputs on the DAC?
If I power Isomagic with only +5V (or rather low noise +12 V regulated down to +5V) will the whole digital section inkl HDCD work?

All comments are appreciated. / BR Tomas Fridstrom
  Reply With Quote


Isomagic w transformers in amplifierHide 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
Wanted: Cambridge Audio IsoMagic S700 DAC johnm Swap Meet 0 30th May 2009 04:10 PM
Isomagic ground loop - Should PSU be earthed?? jamesd256 Digital Line Level 4 19th September 2008 07:10 AM
Isomagic clock link to RME Soundcard SimonInd Digital Source 0 24th December 2007 04:03 PM
Isomagic schematics and mod hints TomasF Digital Source 4 11th March 2007 07:36 AM
Isomagic modifications Bennyboyph Digital Source 1 7th April 2005 11:08 AM

New To Site? Need Help?

All times are GMT. The time now is 07:30 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio