I use an old version of Agent. It works much better than GG.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
I think you want a 4 wire connection into the chamber, so there is no current flowing through the voltage sense wires. Put modest resistors outside between +sense and +supply, and -sense and -supply, so if any connection in the chamber is broken, it will not cause overvoltage. Something like 100 Ohms would be fine. When the 4 wire circuit is hooked up right, the resistors will become insignificant. This is the classic remote- sense power supply scheme.
For noise, you can use 4 wire shielded cable.
Jon
Oh, topics get 'derailed' all the time. With google groups if you click on the little triangle in the upper RH corner, there is an option for 'show original' and that lets you see the post in Currrier.. and thus the ascii art.
George H.
Yeah and get well shielded cable, copper mesh and Aluminum foil. And make it well bonded to ground everywhere you can.
What's the impedance of the load?
George H.
Thunderbird works as a traditional usenet reader. Google groups does rather more for you, so I tend use it, rather than Thunderbird.
-- Bill Sloman, Sydney
BFC superpowers to the rescue.
Cheers
Phil "use a bigger hammer" Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Thunderbird. Other folks like knode, Forte Agent, or one or two others.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Yep. I had to drive through a 300A load step without losing more than about a volt, IIRC.
Hey, Wikipedia's disambiguation page for "BFC" lists one possible meaning as "Engineering slang for a supercapacitor." :-)
Cheers, James Arthur
Yup. 300-kelvin resistors are a serious inconvenience when your active devices have 0.01-K noise temperatures. (BF862s are about that good in the flatband.)
Cheers
Phil Hobbs
I need a .4V supply and was going to do exactly this but the opamp is kinda expensive. I'm used to paying 1/3 of the cost of an opam for the entire regulator (above 1.1V).
The NMR amps needed PPM-flat current pulses, so we didn't want thermal tails in the current shunt amp. Hence the buffer inside the loop.
We made our own current shunts, too. That's a whole nother story.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
It must be French. Beaucoup Farads.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
Wouldn't that have to be Beau Farads Coup?
It was a monster computer-grade electrolytic, an absolute beast.
My task was helping a COTS Mean Well 24V supply weather a 300A peak impulse without losing voltage, and without modifying the Mean Well. That didn't leave many options, so out came the BFC.
I tested the impulse response and monitored the SMPS' switching--the Mean Well seemed to like it just fine.
Cheers, James Arthur
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