JFETs and Moog Ladder Filters

[The Dark force of dance]

Y-ellow Juergen & Malcolm 'n' ya'll.

At 08:55 PM 05/20/99 +0200, jh wrote:

>More on the serious side: You can use them as VC resistors in a
>non-ladder configuration (with somewhat limited range, I guess).

I once messed with a VCF made from the MOSFETS in a 4007 package. Might be
worth a mess with for some of you more intrepid experimenters. I remember
they were indeed limited in range but I also remember trimming them down
reasonably successfully. Mind you the cost in 20 turn cermet pots was more
than a bunch of JFETs would have cost. Was all a long time ago.

>How much are they ? Can't get enough of these if you want to select
>them for a certain threshold voltage, or use them as matched pair.
>Good BJTs are available in the 10 cents range, but it's hard to get
>JFETs for less than 30cents (at least from my sources).

You think that's bad. We're talking around AUD$1.20 for a 3819 here. And
you wonder why I'd even bother messing with a MOSFET from a 4007! Ouch!

Be absolutely Icebox.

 _ __        _                              
| "_ \      | |         batzman at all-electric.com / aek at all-electric.com
| |_)/  __ _| |_ ____           ALL ELECTRIC KITCHEN               
|  _ \ / _` | __|___ |  The Elementary Urban sanity CD
| |_) | (_| | |_  / /   out now on Transmission Communications
|_,__/ \__,_|\__|/ /    
                / ,__   http://www.all-electric.com
Goodfortune    |_____|