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In Reply to: RE: Lookiing to build or buy a DAC posted by Thorsten on January 15, 2015 at 20:15:07
Thorsten,
Again, thanks form your time and response.
The consensus seems the be to use a coupling cap so I will. Now! Would there be any benefit to using I/V transformers. Someone said there is enough gain using the resistors supplied for the I/V conversion. Or maybe this DAC isn't worth the expense. I just like playing but I need a reason.
I was going to build a 12VDC supply or just buy one already assembled in place of using a 12V battery. I know using a battery is pure DC but I don't like extra maintenance(making sure of a charge is always there). Thoughts? And believe me Thorsten, I do listen to and trust your judgment.
Follow Ups:
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.
Ciao T
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to untolerable pain. Really, what more could we need?
Thorsten,
I thought these were I/V transformers.
Hi,
> I thought these were I/V transformers.
If someone claims they are - they need to (re)take EE101.
Transformers are physically incapable of converting current to voltage.
They can only change the ratio between impedances/voltage/current.
The current to voltage conversion is still done in a resistor.
Generally I find it preferrable to keep transformers to a sensible minimum in a chain.
As with all things - great if applied in moderation - problems if overdone.
Ciao T
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to untolerable pain. Really, what more could we need?
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