What caps for Analog PS of R2R DAC?

quantran · 30th August 2005, 02:09 AM

People usually use Sanyo OSCON for digital components. However I think such cap may not be suitable for the analog PS pin of R2R DAC chips. Any recommendations?

Black Heart · 30th August 2005, 02:46 AM

Guess it depends a lot on your audio philosophy and preferences. On my PCM1704 based DAC I only use polypropylene and paper/epoxy caps for all the power in the analog section, and that includes all power and reference conections to the D/A convertors. Tried a lot of combinations including the data sheet suggestions of big value electrolytics, but they just gave it a harsh sound. So I went back to bare bones with just the minimum amount of high quality caps needed for good performance. The power supply is detailed in the shunt reg thread at http://www.diyaudio.com/forums/showt...873#post711873

Get rid of al the electrolytics and you'll be happier

quantran · 30th August 2005, 03:28 AM

I agree with your point on electrolytic cap. I tried a few electrolytic caps inlcuding ELNA cerafine in the I/V stage (OPA2134). All of them make the sound grainy so I only use 0.1 uF WIMA MKP10 as bypass caps. Surprise, the bass is still full.

I will try some larger film caps at the Va+ and Va- pin of the DAC chip (AD1865N). Only problem is that they are physically quite big to fit.

30th August 2005, 02:09 AM	#1
quantran diyAudio Member Join Date: Apr 2004 Location: Hanoi	What caps for Analog PS of R2R DAC? People usually use Sanyo OSCON for digital components. However I think such cap may not be suitable for the analog PS pin of R2R DAC chips. Any recommendations? __________________ Quan Tran

30th August 2005, 03:28 AM	#3
quantran diyAudio Member Join Date: Apr 2004 Location: Hanoi	I agree with your point on electrolytic cap. I tried a few electrolytic caps inlcuding ELNA cerafine in the I/V stage (OPA2134). All of them make the sound grainy so I only use 0.1 uF WIMA MKP10 as bypass caps. Surprise, the bass is still full. I will try some larger film caps at the Va+ and Va- pin of the DAC chip (AD1865N). Only problem is that they are physically quite big to fit. __________________ Quan Tran

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30th August 2005, 02:46 AM	#2
Black Heart diyAudio Member Join Date: Aug 2005	Guess it depends a lot on your audio philosophy and preferences. On my PCM1704 based DAC I only use polypropylene and paper/epoxy caps for all the power in the analog section, and that includes all power and reference conections to the D/A convertors. Tried a lot of combinations including the data sheet suggestions of big value electrolytics, but they just gave it a harsh sound. So I went back to bare bones with just the minimum amount of high quality caps needed for good performance. The power supply is detailed in the shunt reg thread at http://www.diyaudio.com/forums/showt...873#post711873 Get rid of al the electrolytics and you'll be happier

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