On Dec 20, 5:11*pm, Lemon Tree wrote:
I have posted a Negative Dynamic Resistance circuit collection along
with some other things hehttp://code.google.com/p/lemontree/downloads/list
I am no Alan Yates however maybe you will find some things of
interest.
Sean O'Connor

Others that a search of your document didn't find:
--Tunnel diode
--Back diode
--Unijunction transistor
--Gas discharges (e.g., neon light bulbs and even arcs in air)

Historical note: the negative resistance of an arc was used to excite
an LC resonator in _arc_ (as opposed to spark) transmitters from a
century or so ago. I'm often amazed at what early radio engineers
were able to accomplish...

I guess there was a hint (at least, maybe more) in the text about
trigger diodes, commonly used to trigger SCRs and triacs.

Cheers,
Tom