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. Many decades ago there were unijuction transistors, you can't get those anymore. 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.
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