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22nd February 2004, 10:23 AM
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#1 |
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diyAudio Member
Join Date: Apr 2002
Location: Munich
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I/V conversion idea
Hi,
just a very vague idea and maybe nothing new: How about connecting the DAC output to the output of an op amp ? The op amp output provides virtual ground, it's + input is tied to ground. Voltage swing is seen across resistors in the op amp rails. Bernhard |
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22nd February 2004, 11:16 AM
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#2 | |
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diyAudio Member
Join Date: Mar 2002
Location: Aveiro-Portugal
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Re: I/V conversion idea
Quote:
I think that it will work...try it!! Tell us about the sound quality  PS: The output is even balanced...i'm curius!... 
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Jorge |
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22nd February 2004, 12:40 PM
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#5 | |
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diyAudio Member
Join Date: Apr 2002
Location: Munich
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Quote:
A quick & dirty schematic, the 3,75k used to simulate the 4mA current. Again, maybe nothing new but as I am new to I/V, I don't know. Can be built discrete too and without output cap... Comments 
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22nd February 2004, 12:54 PM
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#6 | |
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diyAudio Member
Join Date: Mar 2002
Location: Aveiro-Portugal
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Quote:
I was thinking that that the current output of the dac was connected straight to the op amp output... that way no offset to care...and the output will be in resistors in series with supply pins of the op amp... 
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Jorge |
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22nd February 2004, 01:00 PM
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#7 |
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diyAudio Member
Join Date: Apr 2002
Location: Munich
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Yes, I was thinking like this too, but then the signal is cut in positive and negative halfs and has to be put together again somehow.
On a sine current input there will be only a positive halfwave on the positive rail resistor. And negative rail resistor respectively. |
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22nd February 2004, 01:03 PM
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#8 | |
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diyAudio Member
Join Date: Mar 2002
Location: Aveiro-Portugal
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Quote:
Not if you force the op amp to work in class A by a pull down resistor from the power rail ...
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Jorge |
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22nd February 2004, 01:18 PM
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#9 | |
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diyAudio Member
Join Date: May 2003
Location: England
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Quote:
mike just realised this will not be practical - tube dude's idea may be better |
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22nd February 2004, 01:20 PM
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#10 | |
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diyAudio Member
Join Date: Mar 2002
Location: Aveiro-Portugal
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Quote:
Yes...the CCS is even better than the resistor....and will inject much less suplly noise!
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Jorge |
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