25kV shunt regulator? Snicker, don't they know 6BK4s are cheaper? ;-)
If used at ground, the heater only consumes a "little" more power than their
50mA LED does, although you still need the -100V grid bias from somewhere. Hrm.Tim
25kV shunt regulator? Snicker, don't they know 6BK4s are cheaper? ;-)
If used at ground, the heater only consumes a "little" more power than their
50mA LED does, although you still need the -100V grid bias from somewhere. Hrm.Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
manufacturers)
(1Mbits/s)
so under half of what digikey wants for something similar
we normally use a bulkhead version so we can get it bolted to the front plate
I'm a bit reluctant to buy cheap sma stuff, I tried it once, it was very cheap but it was crap, center wasn't properly centered, isolation wasn't teflon so it tended to melt when soldered
-Lasse
Maybe they don't trust the Russkys :-) ... Because AFAICT they are the only ones making new ballast tubes, if they still do:
-- Regards, Joerg http://www.analogconsultants.com/
A HV rectifier, 1B3 types, make great regulators and amplifiers and controlled rectifiers, if you put the control signal into the filament voltage. Bandwidth is a tad low.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
You're an idiot. I rigid one.
In showing us how dumb you can be.
OPTO-isolator.
Hard wired forms would not be easy.
"Rigidity"????? What is that?
Incwww.highlandtechnology.com jlarkin at highlandtechnology dot com
*NOW* that you have defined what you meant, there is space for reasonable discussion. May i suggest the use of Kapton as part of the insulating solution; rated at 3,900 volts per mil. Now IF Mylar does not absorb moisture, then use 3 layers of tape: Kapton, Mylar, Kapton OR Mylar, Kapton, Mylar.
The earliest Theremins were controlled that way (using a contemporary filament triode). Clara Rockmore complained that it was still too slow, so electronic gain control was developed.
The 6BK4 is probably a lot faster than the photodiode stack -- I'm willing to bet it has far lower capacitance, and having more current, you can certainly slew it faster. It's not going to have that nasty tempco either -- apparently, above 100C the diode doesn't turn on any more than it leaks. Unfortunately they didn't specify 6BK4 and similar tubes for cutoff current; typical data only gives regulator service, which suggests plate current goes down to at least 45uA (out of a 1-1.5mA max), probably much lower in cutoff.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Interesting. I often need connectors without teflon, because teflon is awful when exposed to radioactivity. But I always have a world of trouble finding any, and they often end up being more expensive than the teflon stuff, despite the tendency to melt.
Jeroen Belleman
Why would anyone want to bring kilovolts to a PCB ?
My guess is that the simplest would be using multimode optical fiber between boards.
After all, due to the widespread use of Ethernet, such multimode fiber transceivers are quite cheap.
Be careful, teflon/conductor contact can exhibit triboelectric effects and make the noise floor of your cable higher than your electronics noise floor!
ability to resist something?, it doesn't take much imagination to guess that dielectric rigidity is probably what an english speaker would call dielectric strength
-Lasse
Le 18/05/2012 17:42, John Larkin a écrit :
Hello John !
Apart Joerg it's strange that the word "rigidity" is something not well understood in this group in fact of dielectrics, i apologies on my English syntax.
Not talking about the other "contributors" who think they have license to insult me.
H
Yes, but it is very important to distiguish between the occasional exposure and continuous exposure to a high voltage. You can have an isolation path that is designed to withstand several kilovolt but when testing it on a Hipot tester for too long of a time period the performance of that barrier can begin to deteriorate.
-- Regards, Joerg http://www.analogconsultants.com/
The syntax (arrangement of words) is not that hard to parse, it's the term "rigidity", which would normally be "dielectric strength" or "breakdown voltage".
Rigidity is a synonym for stiffness, so I thought maybe you're asking about the field dependency of the permittivity matrix, not just where it "breaks"!
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
10kV isolation at the "chip" level?
Yeah, good luck with that having zero experience.
Usenet attracts abusive people. In their real lives, they have probably discovered that people avoid them when they rant insults.
Do you have a PC board that has regions that are 10KV apart? Or do you want to send a signal between separated boards or assemblies that are
10KV apart?A light pipe with a LED on one end and a photodiode on the other would probably be the cheapest way to do this. Data could be async/uart, NRZ, or Manchester, any of the single-wire protocols.
There may be some 10KV optoisolators, maybe even ones that work at 1 MBPS, but as Joerg says, the insulation ratings are often short-term.
Fiber optics would take less mechanical design, but would be expensive in production. Maybe $10 or so for an LED-based link with cheap plastic fiber.
Hey, you could use one of the commercial right-angle light pipes that we discussed in another thread recently. The LED would be surface mount shooting up into the pipe; the other end could dump the light into a TO92 photodiode. Vaguely like this:
Or just a plastic rod with TO92 optos on both ends.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
IOW, just like the local saloon. Generally a nice place but once in a while there will be a guy who wants to play bully, let off a major rant or is looking to pick a saloon fight :-)
What ever happened to TOSLink? I just took a look. Their parts are prohibitively expensive and, no surprise there, very low to zero stock levels. That would probably have been a good system for Habib to use.
[...]-- Regards, Joerg http://www.analogconsultants.com/
In a saloon, the physical proximity inhibits most people who aren't really loaded.
HP/Agilent used to make cheap plastic fiber links, and had sample kits, TTL in and our. Avago probably still does them.
The optos+plastic rod could get close to $1 in production.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.