The fact that open and short are only two possible states misses real loads.
That the load can if reactive cause a shift in the operating point of the BS170s.
The way to set other states is fairly simple, a good old 365p capactitor
across the load.
I have posted about this before, and it fell into the bit bucket.
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Allison
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Post online only,?
direct email will go to a bit bucket.
