Re: Q122/222 Jfet J300 subs for 2215A scope ?


Ed Breya
 

I don't know about the 2215A, but the other 2200s use an opamp. The opamp (JFET input type) provides the DC/LF path.It's overall DC-balanced by the feedback, so the JFET bias is taken care of. It has to be fast enough for the bandwidth required, and the DC conditions are not too critical, as long as the loop can keep it all balanced.

Ed

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