[sdiy] c&k on-on-on switches

[Scott Stites]

Hi all,

Yup, I got my switches yesterday.  They're just what the doctor ordered for
my current project.

And the mysterious section N has been found - thanks!

These switches are just what the doc ordered for my current project - a dual
Rene Schmitz MS-20 filter.  I'm actually using three of them - two of them
switch between the HP, BP and LP modes of each filter (filter A and Filter
B), and one is for selecting tuning modes for each filter:

Position 1:  Enables each freq control of each filter to be tuned
independently.

Position 2:  Enables 'tandem' tuning.  The control for filter A tunes both
filters in tandem, and the control for filter B tunes filter B for an offset
from the filter A control, so an offset can be set for each filter with one
control, and the other control tunes them both up and down while preserving
the offset.

Position 3:  Enables 'tandem/spread' tuning.  Like position 2, except the
filter B control will tune filter A in the opposite direction as filter B,
while the filter A control will still tune them both in tandem.  This is
handy for setting the bandwidth of the composite BP filter both filters will
make when in the cascade mode.  In this case, control B sets the bandwidth
and control A sets the center frequency.

This switch, an extra TL074 and a few resistors made all that possible.  I'm
thinking it would be an interesting setup for other control circuits as
well.  Thanks again to Harry for pointing these out!

Cheers,
Scott


----- Original Message -----
From: "Tim Parkhurst" <tparkhurst at siliconbandwidth.com>
To: "'gregory zifcak'" <zifcak at hotmail.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, October 14, 2004 4:00 PM
Subject: RE: [sdiy] c&k on-on-on switches


> AHA!!! I found it!
>
> I noticed that the data sheet in Greg's first link had the rather cryptic
> note "for three way switch wiring, refer to Section N." Okay, where the
heck
> is Section N? Well, after some hunting around on the ITT Cannon web site,
I
> found the PDF of their full line switch catalog, and low and behold,
almost
> at the very end, was the elusive Section N. Here's a link:
>
>
http://www.ittcannon.com/media/pdf/catalogs/full/SW_ProductCatalog_Section_N
> .pdf
>
> As always, watch out if that link word wraps.
>
> You need to go to the bottom of the very last page of Section N, and
you'll
> see a handy little diagram. It shows that if you add a jumper between pins
3
> and 5, you now have a SP3T switch with the following sequence (forgive the
> ACSII switch diagram, but I think you get the idea):
>
> 6   --3
>    |
> 5--   2
>
> 4     1
>
> Position 1 = 2 connects to 1
>
> Position 2 = 2 connects to 4
>
> Position 3 = 2 connects to 6
>
> As a reminder, the keyway on the switch threads is used as a reference to
> show which position is where on the switch. This setup is exactly what I
was
> looking for, although some of you might need both sets of poles, in which
> case you'll need a different switch.
>
> Cheers!!
>
>
> Tim (Section 8) Servo
>
> "Imagination is more important than knowledge." - Albert Einstein
>
> ********************************************************
> > -----Original Message-----
> > From: gregory zifcak [mailto:zifcak at hotmail.com]
> > Sent: Thursday, October 14, 2004 3:00 PM
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: [sdiy] c&k on-on-on switches
> >
> > so,
> >
> > i got my on-on-on switches from goldmine today, does anyone know which
> pins
> > are which? i'm used to standard on-off-on dpdt switches. if these are
> > similar, which are the two contacts for the center on position? if it's
> dpdt
> > and on-on-on, wouldn't it need 2 poles + 3 more pairs of throws? i found
> > this, but it didn't seem to help:
> >
> > http://www.ittcannon.com/media/pdf/catalogs/Leaf/SW_toggle_7000.pdf
> >
> > thanks for any clues,
> > greg
> >
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