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Current source in DDAC1543 to do I to V conversion?
Current source in DDAC1543 to do I to V conversion?
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Old 16th February 2004, 05:44 PM   #1
Bas Horneman is offline Bas Horneman  Netherlands
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Default 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?

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Old 16th February 2004, 06:12 PM   #2
Andypairo is offline Andypairo  Italy
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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.


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