Current source in DDAC1543 to do I to V conversion?

Bas Horneman · 16th February 2004, 04:44 PM

Forgive me for this question. It does not really belong in the digital forum I suppose and it is one that stems from utter ignorance.

But since it has to do with my DDDAC1543
I dared to ask it here.

A resistor is a current to voltage converter. In tube amps often a current source is used to replace a resistor for it's current to voltage job.

Often a simple little CCS is effective. And for this I use a DN2540. My question is: "Could a single depletion mode mosfet replace the resistors in Doede's DAC?" or is there simply not enough voltage to get it to work ? Or are there still other factors at work that would make this a misarable failure.
If it would work "Which I doubt" for what current would the CCS have to be set?

Regards,
Bas

Andypairo · 16th February 2004, 05:12 PM

Hello Bas,
a current source can help I/V conversion but cannot do all the job.

A good circuit for TDA1543 is Rbroer's simple I/V or, even better, his Super-Pair I/V , which have been posted in this section of the forum recently.

I'm going to try it out.

Cheers

Andrea

16th February 2004, 04:44 PM	#1
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	Current source in DDAC1543 to do I to V conversion? Forgive me for this question. It does not really belong in the digital forum I suppose and it is one that stems from utter ignorance. But since it has to do with my DDDAC1543 I dared to ask it here. A resistor is a current to voltage converter. In tube amps often a current source is used to replace a resistor for it's current to voltage job. Often a simple little CCS is effective. And for this I use a DN2540. My question is: "Could a single depletion mode mosfet replace the resistors in Doede's DAC?" or is there simply not enough voltage to get it to work ? Or are there still other factors at work that would make this a misarable failure. If it would work "Which I doubt" for what current would the CCS have to be set? Regards, Bas

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16th February 2004, 05:12 PM	#2
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	Hello Bas, a current source can help I/V conversion but cannot do all the job. A good circuit for TDA1543 is Rbroer's simple I/V or, even better, his Super-Pair I/V , which have been posted in this section of the forum recently. I'm going to try it out. Cheers Andrea

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