Sjöström Audio DIY forum

Projects => Preamps, buffers => Topic started by: pidesd on March 20, 2010, 03:50:22 PM

Title: ssb01 as dac output stage?
Post by: pidesd on March 20, 2010, 03:50:22 PM
heaveno,

wondering how i could use the buffers as an output stage for V out dac. can i just put an input cap and that s it?
Title: Re: ssb01 as dac output stage?
Post by: peranders on March 20, 2010, 04:04:07 PM
You may check how your DAC out is right now. Does it need a buffer?
Title: Re: ssb01 as dac output stage?
Post by: pidesd on March 20, 2010, 04:11:37 PM
not sure what you mean ...but i want to replace the output stage  in my dac. i would tap the signal from the dac chip output directly.
Title: Re: ssb01 as dac output stage?
Post by: peranders on March 20, 2010, 04:55:52 PM
Is the output from the DAC a voltage or a current output? You must know this. Have you checked the schematics?
Title: Re: ssb01 as dac output stage?
Post by: pidesd on March 20, 2010, 05:05:24 PM
it s for a voltage out dac as stated in my first post :-)

either ad1852 or sabre dac. is it easy and desirable to put your buffer as an output stage?
Title: Re: ssb01 as dac output stage?
Post by: peranders on March 20, 2010, 05:30:29 PM
The DAC needs an output filter, do you have that?
Title: Re: ssb01 as dac output stage?
Post by: pidesd on March 20, 2010, 05:44:52 PM
errrr...no but i have a couple of inductors 10k mh at hand...

didnt think i needed anything else...

if i ever end up not seeing a use for the buffers you just sent me i ll give them to someone i guess

would it be easy to make a filter?
Title: Re: ssb01 as dac output stage?
Post by: peranders on March 20, 2010, 07:18:32 PM
You could have them in an active filter.

Curious, but how do you handle the out of band noise from the DAC if you don't have a serious filter? The datasheet suggests a third order Bessel filter.
Title: Re: ssb01 as dac output stage?
Post by: pidesd on March 20, 2010, 07:34:57 PM
well the thruth is that i didnt adress this problem yet. i thought i didnt need a filter.

any clue about where to start on this?

dont want you to make all the work for me. maybe i m getting into something too complicated for my not so expert skills.
Title: Re: ssb01 as dac output stage?
Post by: peranders on March 20, 2010, 10:15:16 PM
You should consult the datasheet for the DAC and also available application notes. Those documents are for commercial designs. It's a very good start.