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|26th February 2008, 09:43 PM||#1|
Join Date: Apr 2006
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
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