zener shunt stabiliser

[Roff]

Re: negative resistance

Anyone remember tunnel diodes? They were a little before my time. This guy has some interesting experiments on his page using homemade negative resistance materials:

**broken link removed**

The VI curve of the tunnel diode was sort of what I started out trying to emulate when I designed the circuit above.
I remember back in about 1966, I lived in a duplex, and tinkered with electronics in my garage. I was making a triggered sweep for my EICO 460 scope, and I had a tunnel diode in the trigger comparator. I quit working on it when my neighbor finally realized that his TV interference coincided with me being in my garage.
I have also seen the link you posted. That guy does some interesting stuff!

 

[Russlk]

Did you know that the peak of the tunnel diode curve is an almost perfect perabola, you can double the frequency of a sinewave by biasing at the peak. I published a circuit for that many years ago.

 

[pike]

here is the progammer i'm talking about:

https://www.siliconchip.com.au/cms/A_30668/article.html

It says in "main features" that it has built-in polarity reversal. I'll try and dig up the shematic.