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-   -   Re: 1 million amp gone astray? (http://www.velocityreviews.com/forums/t739243-re-1-million-amp-gone-astray.html)

 Baron 12-01-2010 11:09 AM

Re: 1 million amp gone astray?

Robert Baer Inscribed thus:

> This is what i just made and measured.
> What the heck is going on?
> Where did the current go?
> Input section is OK; current from voltage source X shows as an
> analog
> voltage at point Y and computes correctly.
> But the summing junction Z value implies a specific current from Y
> to
> Z that is not equal to that from Z to the -15V rail.
> Have a capacitor from Z to ground to prevent oscillation.
>
> +------------------------------------------
> | 100K |
> | +---/\/\--+ |
> | 150K | 2(\ | Y |
> X--+--/\/\---+--( \ ---+---+ |
> +--( / 1 | |
> | 3(/ \ |
> G 100K / 100K |
> \ 6(\ |
> | G--/\/---( \ -+
> Z +-----------( / 7
> | 5(/
> OPA2277 \
> / 150K
> \ Meas: X = 3.0V
> | Y = 2.0V (so far so
> | good)
> V Z = 0.0V (nonsequitor)
> +15

OC 100K between Y & Z ?

--
Best Regards:
Baron.

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