Modular Synth Panels

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
>
>

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

>
> 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)

>
> 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)
>

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.
>

>
> 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.
>

>
> 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.