[sdiy] Verniers for Patch Recording

[James Patchell]

But my panels are densely packed...on a given panel, the number of jacks 
and pots are finite, so compromises are the order of the day.  Seems like I 
can always come up with things to put on a panel...finding space for them 
is a problem.

At 12:00 AM 10/1/2003 -0400, harrybissell wrote:
>OTOH... 10 turn pots means slow changes.  Its like the difference between
>the ARP Odyssey and the MiniMoog... the Minimoog excels in quick changes
>because of the octave switch... but the Ody will allow slow fades over large
>intervals with the sliders.
>
>IMHO I like to have both.  How about Coarse, Fine, AND an octave switch.
>
>I've SEEN your panels (at least photos) Jim... its not like they are densely
>packed or anything :^P
>
>H^) harry
>
>James Patchell wrote:
>
> > At 06:15 PM 9/30/2003 +0200, Czech Martin wrote:
> > >That's why some analog computers have 10 turn pots.
> > >Together with the counter knobs this will cost
> > >20$ per dial, ouch!
> >
> > You know, even at $20 each for the 10 turn pots and counter knobs, I feel
> > that is money well spent.  It sure makes setting the VCO pitch a lot
> > easier, even easier than say a coarse and fine pot, although, probably
> > using a rotary switch to select the octave, and a fine pot to set the pitch
> > in that octave would not be too bad, but, that all takes up valuable panel
> > space.  For the time being, I am sticking with the ten turn pots until I
> > come up with something I like better.
> >
> > >OTOH, for critical applications it is the only way:
> > >Concentric dual pots would be cool, but they are not available.
> > >Old measurement gear has often a coarse pot/switch plus
> > >a "vernier" pot.
> > >I used a 12 step switch "coarse" with 1% resistors
> > >plus vernier pot for some purpose. The steps are not equal,
> > >to my dismay.
> > >
> > >
> > >Another source of error: some people have a couple
> > >of modules of the same type. Resistors have 1%,
> > >but the usual pots have a loose correlation between
> > >angle and resistance. A 1/10 ratio could mean 1.0
> > >on one module, but maybe 1.2 on the other.
> > >
> > >So, not only the type of module and all dials
> > >have to be noted, but also the actual "number"
> > >of the module that was used.
> > >
> > >But you are right, this unacuracy is the reason why
> > >finding an old patch is near to impossible.
> > >
> > >m.c.
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Ian Fritz [mailto:ijfritz at earthlink.net]
> > > > Sent: Dienstag, 30. September 2003 15:52
> > > > To: Czech Martin; synth-diy at dropmix.xs4all.nl
> > > > Subject: RE: [sdiy] Verniers for Patch Recording
> > > >
> > > >
> > > > Hi Martin --
> > > >
> > > > At 05:21 AM 9/30/2003, Czech Martin wrote:
> > > >
> > > > >Depends on how good your eyes are.
> > > >
> > > > True.  Mine are just so-so. It also depends on how large the
> > > > knob is.  I
> > > > made a linear vernier about 5 cm long (corresponding to a
> > > > typical small
> > > > synth knob) and I can easily set and read the vernier at my
> > > > normal reading
> > > > distance.  It has a much coarser scale than I've seen on the
> > > > old radio
> > > > verniers. I did it that way to make it fairly easy to
> > > > construct.  You could
> > > > copy the image I posted into a graphics program and reduce it
> > > > to different
> > > > sizes to see how it works for your eyes.
> > > >
> > > > >I guess some control voltage pathes are more
> > > > >sensitive than others.
> > > >
> > > > Right.  But I think If you have a complex patch you may still
> > > > want to get
> > > > all the parameters quite accurately to avoid accumulated error.
> > > >
> > > > >What about a range switch together with the pot?
> > > > >This will virtually increase the resolution of the pot.
> > > > >It can be a 2 position, a 3 postion, or the usual
> > > > >12 position switches depending on application.
> > > >
> > > > Well, I did mention that at the end of the post.  Myself, I wouldn't
> > > > consider that practical for every single control, but for
> > > > some controls it
> > > > would probably be necessary.  For example if you need to
> > > > reproduce an FM
> > > > patch, the frequency ratio needs to be very accurate.  The modulation
> > > > amplitude I'm not sure about.  That could get tricky.
> > > >
> > > >    Ian
> > > >
> > > >
> >
> >          -Jim
> > ***************************************************
> > I'm a man
> > But I can change
> > If I have to
> > I guess.
> >
> > Man's Prayer
> > Red Green
> >
> > ***************************************************
> > http://www.oldcrows.net/~patchell
> >
> > http://members.cox.net/patchell
> >
> > ***************************************************

         -Jim
***************************************************
I'm a man
But I can change
If I have to
I guess.

Man's Prayer
Red Green

***************************************************
http://www.oldcrows.net/~patchell

http://members.cox.net/patchell

***************************************************