On Monday, April 16, 2012 09:22:01 PM Jon Elson did opine: > gene heskett wrote: > > On Monday, April 16, 2012 12:05:22 AM Jon Elson did opine: > >> It was described earlier that the charge pump input to the G540 is > >> capacitively > >> coupled, and apparently has a large coupling cap. If it is driving > >> the base of a > >> BJT with the cap, that would require a pretty big one. > >> > >> Jon > > > > Gee Jon, its been yonks, as in 2+ decades since I last played with a > > BJT. Do I properly recall that the triggering voltage is more than a > > normal NPN transistor would have? > > BJT is shorthand for Bipolar Junction Transistor, and they can be either > PNP or NPN.
Seems I need to go wash the egg off my face. :) > Many decades ago there were unijuction transistors, you can't get those > anymore. Which is precisely what I was thinking of. :( > Perhaps that is what you were thinking of. But, I was thinking of a > generic PNP or NPN > transistor, but the person who described the circuit a few days ago did > not say > whether it was junction transistor or a FET. > > Jon And there is a rather large diff between them. Not to mention there are quite a variety of FET's available, each of which takes its own biasing setup in order to function correctly. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Time is an illusion, lunchtime doubly so. -- The Hitchhiker's Guide to the Galaxy ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
