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Old 3rd November 2009, 12:45 AM   #1
yzriver is offline yzriver  United States
diyAudio Member
Join Date: Aug 2008
Location: Boston, MA
Default DAC Headphoneamp COMBO

After 2 months slow work, I just finished my DAC-Headamp combo.
The headamp is SOHA II. the DAC board works with DIR9001 and PCM1793.
Click the image to open in full size.

Here it is my case prototype of the SOHA-DAC combo. I know the cutting and wiring is shameful, but they are work well now. Next step is to find some good board for a nice box and redo the wire.
There are two LED that indicate the source is coaxial-DAC or RCA line in. Now the source is DAC.
Click the image to open in full size.

On the top the metal net is a piece of officedepot's card holder.
Click the image to open in full size.

The DAC board used 12DC single rail input, and splited it into +-6V and virtual ground by LM1875. I removed the LM1875, and made a DC source on the yellow board, +-9V to the OPAMP, +6V to DAC, -6V for source switching and LED. Since the OPAMP is using the seperated DC source from DAC, I put the OPAMP, decoupling cap into another board. The opamp board is connected to the socket with pins. The two relays are for coaxial or RCA switching, and LED controling.
Click the image to open in full size.

Click the image to open in full size.
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