Ping Jim Thompson

I don't mean to be a pest but I am having trouble wrapping my head around t his circuit, as depicted at :

It seems pretty much useless. What exactly does the thing do ? Act like a S cmitt trigger or something ? On that page the output is coming out of like

Does it have to do with transmission line impedance or something ?

I scanned the text on that page and I see pretty much what it does. And dow n a ways is a integrator, I see what that does. What I don't see if why. Th is can be done so many ways, how did it warrant a name ?

I simply used an additional output resistor. My loads were balanced anyway (an audio hybrid) so errors were minimal. If you need a four-quadrant current source, I think you're going to pretty much going to need two opamps, if not duplicate the whole thing.

The idea is to maintain a constant current at Zl.

Remove Zl and the circuit acts like a schmitt trigger because the load R is beyound what voltage can be supplied to balance it.

With the x2 gain network at the - input and V-divider at the + input, it should maintain balanced (I) at the ZL as Zl R value changes, which of course will change voltage at that node to maintain the disired (I).

Screwing with the input voltages at the input nodes can also allow you to adjust (I) or play with the feed back loop values. You are limited by what the op-amp can hand out. If you have Ltspice drop it in there and see for yourself.

Jamie

When you're so ignorant of circuit design you can't do loop and nodal analysis by hand everything looks useless >:-} ...Jim Thompson

I still don't know what you're trying to accomplish... please describe a gozinta/gozouta relationship you're trying to accomplish. ...Jim Thompson

That seems reasonable.

It is better to light a single candle than to curse the darkness.

Baaaah! Humbug >:-}

Learn some electronics/math and cut the crap. If you can't understand it, you have no business commenting. ...Jim Thompson

Or..... if you can't say anything nice.... I'm just sayin'! Crankpot! ;)