Modular Synth Panels

Can please somene tell me were did this come out? or simply maybe it is also called in a different way?
Thanks Enrico

oops -- vibrato : )
uses same board as interp. scanner


Scott Deyo
The Bridechamber
contact@...
http://www.bridechamber.com
Jealous Edison Record Kompany
http://www.jealousedison.com

On Mar 20, 2009, at 9:48 AM, edibennardo wrote:

> Can please somene tell me were did this come out? or simply maybe it
> is also called in a different way?
> Thanks Enrico
>
>

I believe you can combine the interpolating scanner and vibrato into
one as Dave Brown has done:

http://modularsynthesis.com/jhaible/scanner/jhscanner.htm

Then you don't have to provide two panels for this one PCB. I was
going to assemble mine in a similar way, but probably without the LED
inside the pot shaft. I figured this would probably require a 3U
panel; Dave's is a bit tight at 2U, imho.

>
> oops -- vibrato : )
> uses same board as interp. scanner

Will and I were discussing this just last night and have decided to do a combined unit. A 3U panel would be fine - or four. I occurred to us that a panel similar to the elliptical Klee could probably be implemented in four units. And we'd be fine with that too. In fact, there are particular advantages to that implementation... one being that it would graphically represent the rotary nature of the original Hammond scanner. FWIW. Bill (and Will)

--- In ModularSynthPanels@yahoogroups.com, Scott Juskiw <scott@...> wrote:
>
> I believe you can combine the interpolating scanner and vibrato into
> one as Dave Brown has done:
>
> http://modularsynthesis.com/jhaible/scanner/jhscanner.htm
>
> Then you don't have to provide two panels for this one PCB. I was
> going to assemble mine in a similar way, but probably without the LED
> inside the pot shaft. I figured this would probably require a 3U
> panel; Dave's is a bit tight at 2U, imho.
>
>
>
> >
> > oops -- vibrato : )
> > uses same board as interp. scanner
>

I'm not sure a circular (or elliptical) pattern would be applicable to
this circuit because it does not scan in a circle, it scans up and
down. I think something more like Dave Brown's design would be better,
although it does necessitate small knobs for the 9 inputs. However,
the remainder of the panel could spread the controls out a bit more.

I haven't built my scanner/vibrato yet, but I have worked out a list
of elements that the panel will require. Anybody want to take this on
and try to design something?

Required:

1. Audio In/Out: 2 jacks (IN and OUT)
2. Interpolating Scanner Controls: 9 jacks (IN), 9 pots (LEVEL), 9 LEDs
3. LFO Rate Control: 1 jack (RATE CV IN), 2 pots (RATE, RATE CV)
4. LFO Depth Control: 1 jack (DEPTH CV IN), 2 pots (DEPTH, DEPTH CV)
5. Scan Control: 1 jack (SCAN CV IN), 2 pots (MANUAL, SCAN CV)
6. Lag Control: 1 switch
7. Chorus/Vibrato control: 1 switch (see *note 1)
8. Function control: 9 pin 4 pole rotary switch

Optional:

1. Input attenuator (for Vibrato/Chorus): 1 pot
2. Lowpass filter (for Vibrato/Chorus): 1 pot
3. Celeste control (for Vibrato/Chorus): 1 switch (see *note 2)

*Note 1
There are several possibilities for the Chorus/Vibrato control:
a. 1 switch (as shown in the schematics)
b. 1 pot (as Dave Brown did)
c. 1 switch and 1 pot (as JH did)

*Note 2
Here's what JH had to say about the Celeste switch:

"Celeste is an option for which no on-board connector is provided,
namely removing the termination resistor of the delay line, R104, from
the circuit and thus causing reflections of the delayed signal back
towards the input of the delay line. If you want to implement this,
lift one side of R104 from the PCB, and re-connect it via a switch."

Here's what Dave Brown had to say about the Celeste switch:

"The Celeste switch adds a 0.01 uF and 2K resistor in series with R104
to mis-terminate the delay line causing reflections. I selected these
values empirically."

Sounds like there is some room for experimenting with the Celeste
option. It's possible that a pot could be used to control the level of
mis-termination, but someone would need to verify whether or not this
is worthy of taking up panel space. Having a Celeste switch is
probably worthwhile.

>
> Will and I were discussing this just last night and have decided to
> do a combined unit. A 3U panel would be fine - or four. I occurred
> to us that a panel similar to the elliptical Klee could probably be
> implemented in four units. And we'd be fine with that too. In
> fact, there are particular advantages to that implementation... one
> being that it would graphically represent the rotary nature of the
> original Hammond scanner. FWIW. Bill (and Will)

Of course you're right about that, Scott. We'd forgotten that entirely - so kind-of focused on our recently acquired Hammond C1 tone generator and looking at its rotary "scanner" thing. Yup - you're right linear makes much more sense for this. <shrug> Bill and Will

--- In ModularSynthPanels@yahoogroups.com, Scott Juskiw <scott@...> wrote:
>
> I'm not sure a circular (or elliptical) pattern would be applicable to
> this circuit because it does not scan in a circle, it scans up and
> down. I think something more like Dave Brown's design would be better,
> although it does necessitate small knobs for the 9 inputs. However,
> the remainder of the panel could spread the controls out a bit more.
>
> I haven't built my scanner/vibrato yet, but I have worked out a list
> of elements that the panel will require. Anybody want to take this on
> and try to design something?
>
> Required:
>
> 1. Audio In/Out: 2 jacks (IN and OUT)
> 2. Interpolating Scanner Controls: 9 jacks (IN), 9 pots (LEVEL), 9 LEDs
> 3. LFO Rate Control: 1 jack (RATE CV IN), 2 pots (RATE, RATE CV)
> 4. LFO Depth Control: 1 jack (DEPTH CV IN), 2 pots (DEPTH, DEPTH CV)
> 5. Scan Control: 1 jack (SCAN CV IN), 2 pots (MANUAL, SCAN CV)
> 6. Lag Control: 1 switch
> 7. Chorus/Vibrato control: 1 switch (see *note 1)
> 8. Function control: 9 pin 4 pole rotary switch
>
> Optional:
>
> 1. Input attenuator (for Vibrato/Chorus): 1 pot
> 2. Lowpass filter (for Vibrato/Chorus): 1 pot
> 3. Celeste control (for Vibrato/Chorus): 1 switch (see *note 2)
>
> *Note 1
> There are several possibilities for the Chorus/Vibrato control:
> a. 1 switch (as shown in the schematics)
> b. 1 pot (as Dave Brown did)
> c. 1 switch and 1 pot (as JH did)
>
> *Note 2
> Here's what JH had to say about the Celeste switch:
>
> "Celeste is an option for which no on-board connector is provided,
> namely removing the termination resistor of the delay line, R104, from
> the circuit and thus causing reflections of the delayed signal back
> towards the input of the delay line. If you want to implement this,
> lift one side of R104 from the PCB, and re-connect it via a switch."
>
> Here's what Dave Brown had to say about the Celeste switch:
>
> "The Celeste switch adds a 0.01 uF and 2K resistor in series with R104
> to mis-terminate the delay line causing reflections. I selected these
> values empirically."
>
> Sounds like there is some room for experimenting with the Celeste
> option. It's possible that a pot could be used to control the level of
> mis-termination, but someone would need to verify whether or not this
> is worthy of taking up panel space. Having a Celeste switch is
> probably worthwhile.
>
>
> >
> > Will and I were discussing this just last night and have decided to
> > do a combined unit. A 3U panel would be fine - or four. I occurred
> > to us that a panel similar to the elliptical Klee could probably be
> > implemented in four units. And we'd be fine with that too. In
> > fact, there are particular advantages to that implementation... one
> > being that it would graphically represent the rotary nature of the
> > original Hammond scanner. FWIW. Bill (and Will)
>

I've posted an image of my proposal for a combined chorus/vibrato/
scanner panel:

http://www.tellun.com/scanner_panel_1.gif

I wanted to get this to fit into 3U so I had to use small knobs and
non-standard spacing, sorry. It's very similar to Dave Brown's panel;
the 9 jacks/LEDs/pots along the left edge are on the same spacing as
the UEG. I used a switch for the Celeste function, and both a switch
and pot for Chorus/Vibrato control. The switch turns chorus on, and
the pot sets the chorus depth. There was no room to add pots for the
input level and lowpass filter.

On 20-Mar-09, at 2:19 PM, Scott Juskiw wrote:

> I haven't built my scanner/vibrato yet, but I have worked out a list
> of elements that the panel will require. Anybody want to take this on
> and try to design something?
>
> Required:
>
> 1. Audio In/Out: 2 jacks (IN and OUT)
> 2. Interpolating Scanner Controls: 9 jacks (IN), 9 pots (LEVEL), 9
> LEDs
> 3. LFO Rate Control: 1 jack (RATE CV IN), 2 pots (RATE, RATE CV)
> 4. LFO Depth Control: 1 jack (DEPTH CV IN), 2 pots (DEPTH, DEPTH CV)
> 5. Scan Control: 1 jack (SCAN CV IN), 2 pots (MANUAL, SCAN CV)
> 6. Lag Control: 1 switch
> 7. Chorus/Vibrato control: 1 switch (see *note 1)
> 8. Function control: 9 pin 4 pole rotary switch
>
> Optional:
>
> 1. Input attenuator (for Vibrato/Chorus): 1 pot
> 2. Lowpass filter (for Vibrato/Chorus): 1 pot
> 3. Celeste control (for Vibrato/Chorus): 1 switch (see *note 2)
>
> *Note 1
> There are several possibilities for the Chorus/Vibrato control:
> a. 1 switch (as shown in the schematics)
> b. 1 pot (as Dave Brown did)
> c. 1 switch and 1 pot (as JH did)
>
> *Note 2
> Here's what JH had to say about the Celeste switch:
>
> "Celeste is an option for which no on-board connector is provided,
> namely removing the termination resistor of the delay line, R104, from
> the circuit and thus causing reflections of the delayed signal back
> towards the input of the delay line. If you want to implement this,
> lift one side of R104 from the PCB, and re-connect it via a switch."
>
> Here's what Dave Brown had to say about the Celeste switch:
>
> "The Celeste switch adds a 0.01 uF and 2K resistor in series with R104
> to mis-terminate the delay line causing reflections. I selected these
> values empirically."
>
> Sounds like there is some room for experimenting with the Celeste
> option. It's possible that a pot could be used to control the level of
> mis-termination, but someone would need to verify whether or not this
> is worthy of taking up panel space. Having a Celeste switch is
> probably worthwhile.
>

----- Original Message -----

From: Scott Juskiw

To: ModularSynthPanels@yahoogroups.com

Sent: Thursday, March 26, 2009 4:44 PM

Subject: [ModularSynthPanels] JH Chorus/Vibrato/Scanner panel

I've posted an image of my proposal for a combined chorus/vibrato/
scanner panel:

http://www.tellun. com/scanner_ panel_1.gif

I wanted to get this to fit into 3U so I had to use small knobs and
non-standard spacing, sorry. It's very similar to Dave Brown's panel;
the 9 jacks/LEDs/pots along the left edge are on the same spacing as
the UEG. I used a switch for the Celeste function, and both a switch
and pot for Chorus/Vibrato control. The switch turns chorus on, and
the pot sets the chorus depth. There was no room to add pots for the
input level and lowpass filter.

On 20-Mar-09, at 2:19 PM, Scott Juskiw wrote:

> I haven't built my scanner/vibrato yet, but I have worked out a list
> of elements that the panel will require. Anybody want to take this on
> and try to design something?
>
> Required:
>
> 1. Audio In/Out: 2 jacks (IN and OUT)
> 2. Interpolating Scanner Controls: 9 jacks (IN), 9 pots (LEVEL), 9
> LEDs
> 3. LFO Rate Control: 1 jack (RATE CV IN), 2 pots (RATE, RATE CV)
> 4. LFO Depth Control: 1 jack (DEPTH CV IN), 2 pots (DEPTH, DEPTH CV)
> 5. Scan Control: 1 jack (SCAN CV IN), 2 pots (MANUAL, SCAN CV)
> 6. Lag Control: 1 switch
> 7. Chorus/Vibrato control: 1 switch (see *note 1)
> 8. Function control: 9 pin 4 pole rotary switch
>
> Optional:
>
> 1. Input attenuator (for Vibrato/Chorus) : 1 pot
> 2. Lowpass filter (for Vibrato/Chorus) : 1 pot
> 3. Celeste control (for Vibrato/Chorus) : 1 switch (see *note 2)
>
> *Note 1
> There are several possibilities for the Chorus/Vibrato control:
> a. 1 switch (as shown in the schematics)
> b. 1 pot (as Dave Brown did)
> c. 1 switch and 1 pot (as JH did)
>
> *Note 2
> Here's what JH had to say about the Celeste switch:
>
> "Celeste is an option for which no on-board connector is provided,
> namely removing the termination resistor of the delay line, R104, from
> the circuit and thus causing reflections of the delayed signal back
> towards the input of the delay line. If you want to implement this,
> lift one side of R104 from the PCB, and re-connect it via a switch."
>
> Here's what Dave Brown had to say about the Celeste switch:
>
> "The Celeste switch adds a 0.01 uF and 2K resistor in series with R104
> to mis-terminate the delay line causing reflections. I selected these
> values empirically. "
>
> Sounds like there is some room for experimenting with the Celeste
> option. It's possible that a pot could be used to control the level of
> mis-termination, but someone would need to verify whether or not this
> is worthy of taking up panel space. Having a Celeste switch is
> probably worthwhile.
>

Select your rotary switch and make sure there is both panel
room for it and amounting scheme. With my tight spacing I
had to mount mine on a bracket. I don't know if you have
sufficient room for the switch to mount to the front panel.
If not (and I don't think there is clearance) make sure you
have some convenient mounting scheme. For eample, you could
do a horizontal bracket between the potentiometers. If you
go vertical then the bracket would have to mount via the
switch. That would work if you gave up the rear nut.

Just something to think about.

Dave

--- In ModularSynthPanels@yahoogroups.com, Scott Juskiw <scott@...> wrote:
>
> I've posted an image of my proposal for a combined chorus/vibrato/
> scanner panel:
>
> http://www.tellun.com/scanner_panel_1.gif
>
> I wanted to get this to fit into 3U so I had to use small knobs and
> non-standard spacing, sorry. It's very similar to Dave Brown's panel;
> the 9 jacks/LEDs/pots along the left edge are on the same spacing as
> the UEG. I used a switch for the Celeste function, and both a switch
> and pot for Chorus/Vibrato control. The switch turns chorus on, and
> the pot sets the chorus depth. There was no room to add pots for the
> input level and lowpass filter.
>

Good point, thanks. I made sure not to put the rotary switch near the
top and bottom edges of the panel because I know that can interfere
with mounting the module in a cabinet. I will source parts for this
module in the next few weeks to make sure everything fits before
committing to a panel layout.

>
> Select your rotary switch and make sure there is both panel
> room for it and amounting scheme. With my tight spacing I
> had to mount mine on a bracket. I don't know if you have
> sufficient room for the switch to mount to the front panel.
> If not (and I don't think there is clearance) make sure you
> have some convenient mounting scheme. For eample, you could
> do a horizontal bracket between the potentiometers. If you
> go vertical then the bracket would have to mount via the
> switch. That would work if you gave up the rear nut.
>
> Just something to think about.