Hi there.
OK - I'm sure someone smarter will chip in soon, but here goes..
The CGS 37 has 8 voltage followers in the diagram on the right hand
side. If the 10K resistors were omitted, they will act as active
(non-inverting) buffers.
Wire a pair of them with the same input, and you will have two buffered
outputs from a single source - a splitter. The 47pF cap in each may not
be needed - if omitting it, then use a wire link in its place,
effectively joining the output to the inverting input.
As far as the INPUT and switch to EXP 2 (which I guess means expression
pedal) this can be done with a DPDT changeover switch easily.
For the tap tempo side of your diagram, you could try using the
dual-inverting opamps that make up the BASE CV input.
OMIT the 100k resistor joining IC1C pin 9 to IC1D pin 14.
OMIT the 100K resistor joining IC1B pin 6 to IC1A pin 1
The BASE CV circuit now replaces the SPLITTER and POLARITY chip for Tap
tempo and the TOGGLE.
The hole nearest IC1A pin 1 that used to have one end of a 100K
resistor joining it to IC1B pin 6 is now an INVERTING (reverse
POLARITY) output from the BASE CV input.
Point "A" is now a buffered non-inverting output.
To get the toggle and tap tempo inputs connected via a switch, remember
that IC1A and IC1C are connected in a dual inverting configuration,
which means that any input to the circuit must have a 100K resistor
between the jack input and the inverting input of the opamp ... sooo...
To get more than one input to the INVERTING output, use BASE CV in as
one input, and add a second input to IC1A pin 2 via a series 100K
resistor. This will then provide a mix of both sources, with a regular
non inverting output at point "A" and an inverted output from the empty
resistor hole nearest ICIA pin 1.
Use switches to disable one or both inputs (you'll have to work that
bit out yourself....)
You get a bonus mixer too for SPLITTER D1 and D2. The main input to it
is now the SPREAD CV input. Add extra inputs via series 100K resistors
to IC1D pin 13. The output of this mixer will now be where the 330R and
100K resistors meet, which is also point K. This joins neatly to the
input of The Splitter D1 and D2
If this is not needed, simply cut the trace between the join of the
330R and 100K resistors and the input to IC2A pin 3.
I hope that's clear enough! Bottom line, with a bit of experimenting,
you should be able to do it all with a CGS37 - good luck!
cheers,
Dave
OK - I'm sure someone smarter will chip in soon, but here goes..
The CGS 37 has 8 voltage followers in the diagram on the right hand
side. If the 10K resistors were omitted, they will act as active
(non-inverting) buffers.
Wire a pair of them with the same input, and you will have two buffered
outputs from a single source - a splitter. The 47pF cap in each may not
be needed - if omitting it, then use a wire link in its place,
effectively joining the output to the inverting input.
As far as the INPUT and switch to EXP 2 (which I guess means expression
pedal) this can be done with a DPDT changeover switch easily.
For the tap tempo side of your diagram, you could try using the
dual-inverting opamps that make up the BASE CV input.
OMIT the 100k resistor joining IC1C pin 9 to IC1D pin 14.
OMIT the 100K resistor joining IC1B pin 6 to IC1A pin 1
The BASE CV circuit now replaces the SPLITTER and POLARITY chip for Tap
tempo and the TOGGLE.
The hole nearest IC1A pin 1 that used to have one end of a 100K
resistor joining it to IC1B pin 6 is now an INVERTING (reverse
POLARITY) output from the BASE CV input.
Point "A" is now a buffered non-inverting output.
To get the toggle and tap tempo inputs connected via a switch, remember
that IC1A and IC1C are connected in a dual inverting configuration,
which means that any input to the circuit must have a 100K resistor
between the jack input and the inverting input of the opamp ... sooo...
To get more than one input to the INVERTING output, use BASE CV in as
one input, and add a second input to IC1A pin 2 via a series 100K
resistor. This will then provide a mix of both sources, with a regular
non inverting output at point "A" and an inverted output from the empty
resistor hole nearest ICIA pin 1.
Use switches to disable one or both inputs (you'll have to work that
bit out yourself....)
You get a bonus mixer too for SPLITTER D1 and D2. The main input to it
is now the SPREAD CV input. Add extra inputs via series 100K resistors
to IC1D pin 13. The output of this mixer will now be where the 330R and
100K resistors meet, which is also point K. This joins neatly to the
input of The Splitter D1 and D2
If this is not needed, simply cut the trace between the join of the
330R and 100K resistors and the input to IC2A pin 3.
I hope that's clear enough! Bottom line, with a bit of experimenting,
you should be able to do it all with a CGS37 - good luck!
cheers,
Dave
On Jan 25, 2012, at 19:50, grayz4sure wrote:
>
>
> --- In cgs_synth@yahoogroups.com, "grayz4sure" <grayz4sure@...> wrote:
> >
> > CV Mega Mixer?
> >
> > I notice it is out of stock, but would it work?
> >
> or CV Cluster?
>
>
>