gene heskett wrote: > Looking at the scope traces, either the probe is way out of calibration > against the scopes own test square wave, or the 540 has a low value series > resistor, 33-120 ohm range, with several hundred pf on the other side of > the resistor as a noise filter on that input, and likely on all inputs > since engineers have a tendency to 'step & repeat' for that stuff. > 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.
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