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Old 11th September 2003, 02:19 PM   #61
Werner is offline Werner  Europe
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Indeed. Variations on this theme ...
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Old 11th September 2003, 04:12 PM   #62
peufeu is offline peufeu  France
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Quote:
Originally posted by Pedja

Werner,

If you add one NPN here, you might have linear output impedance till the MHz range.

Pedja
But it would no longer be a shunt reg ? It depends on how you wire it...
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Old 11th September 2003, 05:46 PM   #63
Pedja is offline Pedja  Serbia
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Quote:
Originally posted by peufeu
But it would no longer be a shunt reg ? It depends on how you wire it...
It would. Nothing is in series. But in fact 431 will be used as a voltage reference only (instead of zener in Werner’s schematic).

Pedja
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Old 11th September 2003, 10:37 PM   #64
Bricolo is offline Bricolo  France
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Why is the TL431 the only IC shunt reg used ?

For series IC regulators, there is a little diversity (317, 1085, 7815...) but for shunt regs, the only one I see here is the 431.
What about the 1431, this one looks better than the 431
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Old 18th September 2003, 07:17 PM   #65
Bricolo is offline Bricolo  France
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Quote:
Originally posted by Bricolo
Why is the TL431 the only IC shunt reg used ?

For series IC regulators, there is a little diversity (317, 1085, 7815...) but for shunt regs, the only one I see here is the 431.
What about the 1431, this one looks better than the 431

no answear?
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Old 20th September 2003, 12:13 AM   #66
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Default Opa660 I/V

I was just reading this thread and noticed someone ask about OPA660.

As far as I know I'm the only one who has tested this I/V. The circuit is based on Thorsten suggestions.

I can't compare with all these stages on the thread but is my guess that is very competitive.

I did some monitoring of the drift at the output of the OPA and it was not more than 3 mv with the lid on top of the CDP so I decided to get rid of the output cap. The circuit uses current injection at the DACs output

Soudwise is realy outstanding.

See the OPA660 I/V thread
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Old 15th December 2005, 11:53 PM   #67
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I'm sorry about digging this old thread up...

Currently I'm trying to implement a version of peufeu's I/V stage for my Monica 2. The only problem is that there is no way to get workable voltages out of what's feeding the monica for the OPAMP and the CCS, so I have to get an external dual PSU to do the job.

My question is where do I stab the ground of the dual PSU? The ground on peufeu's circuit looks like it should lead back to Monica's analog ground, and not all the current is flowing into V-.... so does that mean I would end up tying the ground of my dual PSU to the Monica's, just by implementing this circuit? This might cause some ground loop issues in my situation...
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Old 16th December 2005, 03:28 PM   #68
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no takers?
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