[Boatanchors] ongoing Johnson adventure

[Rob Atkinson]

Okay Bob, tnx vy much.  I'll have to look at the drive pot on the
HT-20.  I'm curious as to what sort of value and power rating they
used.  No probs with it yet.

73
Rob
K5UJ


> Hi Rob,
>
> I got to thinking about using a power FET instead and found that someone
> has already done that, and since FETs are more akin to vacuum tubes I
> like this method better.   The STM part shown is overkill, with an 800V
> 11A rating,  but it's $5.57 from Digikey. Cheaper N-channel Power
> MOSFETs with sufficient voltage and current ratings should be fine.
>
> Here is a snippet showing the driver pot replacement from the Johnson
> Ranger redesign by WA4DSP:
>
>   http://i.imgur.com/gVP91ui.png
>