Field Effect Transistor Question

[J. Forster]

James W. Miller wrote:

> Hi Folks,
>
> Are there any Field Effect Transistor experts out there in Boat Anchor Land?
>
> I'm looking for a high voltage J FET. I''ve just constructed a common drain
> buffer using a 2N3819 JFET which provides a High Z interface between my
> frequency counter (low Z in) and old Boat Anchor rigs.
>
> It works fine, however, the problem is that I want to find a high voltage FET
> so that it can accept inputs of  at least +/- 100 volts.

Why do you want +/- 100 volts into your counter, especially at RF frequencies ??
How about using an AC coupled input followed by an RF attenuator and then your
buffer stage. Actually, the buffer amp might not even be necessary.-John

> Can anyone suggest the number of high voltage JFET that is available.  It
> should have a "Gate-Source Breakdown Voltage" of 100 volts or more.
>
> Thanks in advance.
> 73,
> Jim, WA2UMP
>
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