Variable capacitors?

[zachary vex]

hmm.  is that a magazine limited to your part of the world?

[puretube]

what? where? who got the schem?
need to revenge-ineer it, to see if it too can go from neg to pos...
:lol:
(the best region is around "0" - for de-millerization purposes) (aka: neutralize)

[Paul Perry (Frostwave)]

hmm.  is that a magazine limited to your part of the world?

You can subscribe either hard copy, or on-line.
http://www.siliconchip.com.au/

Here's somewhere else to buy odd copies from:
http://www.futurlec.com/

[Joe Kramer]

Mr.Vex: already put it in the MoJo-thread:
http://diystompboxes.com/sboxforum/viewtopic.php?t=25039&start=270
(after you hinted that in a recent thread)

Oops.  I get the feeling I stepped in a pile of something smelly on the sidewalk here.  Would anyone accept the possible distinction between fake mojo and real mojo?  If so, I meant the latter. . . .

Joe

PS: I tend to think the 4558 belongs to the former, with apologies to STM if he wasn't speaking ironically.

[triskadecaepyon]

I've tried making variable caps before out of old potentiometers.  I could only get about .0047 uf and smaller out of them.  VERY difficult.

[puretube]

well, 4n7 isn`t that bad, for a mechanical "rotocap"...

[Joe Davisson]

I posted a couple circuits for using small caps for emitter-bypass:
http://www.diystompboxes.com/analogalchemy/pedals/gyrators.html

The inductive version is wah-ish. Otherwise it acts like a standard gain stage.

[puretube]

hey, that`s interesting Joe: I only ever used the 1-Q-gyrator in powersupply filtering before...