Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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RE: Lookiing to build or buy a DAC

Posted by Thorsten (M) on January 16, 2015 at 11:24:19

In Reply to: RE: Lookiing to build or buy a DAC posted by xaudiomanx on January 16, 2015 at 09:56:31:

Hi,

> Now! Would there be any benefit to using I/V transformers.

There is no such thing as an I/V transformer.

> Someone said there is enough gain using the resistors supplied
> for the I/V conversion.

If I remember right (it has been a while), the output is around 0.7V for "digital full scale", substantially lower than common DAC's and/or CD-Players.

> Or maybe this DAC isn't worth the expense.

It can be quite good.

> I was going to build a 12VDC supply or just buy one already
> assembled in place of using a 12V battery.

Depending on the quality of this supply this may or may not work well.

A batter does give a known behaviour. If you have a battery rated at 6AH/12V you can run this DAC around 100 Hours with a Battery that is in top condition. Even one that is in a very bad state can do two days straight. The typical surplus jobs pulled out of fire alarm systems because of laws and regular maintenance I used to get where usually still worth > 80% capacity and cheap.

Make the Power switch so that when the DAC is off the battery is linked to the charger (one that trickle charges a full battery) and remember to turn the DAC off when not listening and I doubt you will even notice the battery.

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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