Slew Rate (Part IV) and the Tale of the three Source Followers

Some of you may be a bit fed up already with these slew rate posts, however I find this fascinating as is taking me through different routes of experimentation.

On my last tests, I abused the DN2540 to an extent which meant the dead of it. So I ended up adding the appropriate back to back protection zeners on the gate:

Depletion FEET with protection zeners
Depletion FET with protection zeners

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