"Jim Lesurf" wrote in message
...
In article , Mike Gilmour
wrote:


Don't forget the defunct Weathers FM cartridge as well.

Aha! I was just trying to recall the name and details of a cartridge that
IIRC used capacitance sensors and an AC signal to detect stylus movements.
Was that the "Weathers FM"? I can recall hearing mentions of this years
ago, but not any details.

Slainte,

Jim

--
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html


It was a very good sounding cartridge for its time (or now even?) Seem to
remember it had an external oscillator unit fed to some sort of capacitance
sensor which modulated the frequency according to stylus movement then was
returned to demod in the external unit with some sort of detector circuit,
perhaps a Foster Seeley discriminator but I don't know. I'll Google it as
I've forgotten a lot,! It could be made even better nowadays, there was
very little for the stylus to move so it had an extended FR. I would really
like to hear one nowadays :-)