Cgs synth

Looking forward to handy extra modulation with this module!

How fast or how slow would the LFO go with just the 47n cap and no mods?

I'd love to have it at least from around 30 seconds to almost audio. Will this go without mod?

Curious for other cap speeds too.

I'll only use the vari outs for now.
This way all the knobs (speed, shape, vari) will affect the lfo, no?

And is it still possible to trigger the cgs programmer/sequencer while running the LFO on 12V (80%) with a very narrow pulse/square?

Hi.

On 16 Oct 2012, at 07:54, sirolffoonav wrote:
> Looking forward to handy extra modulation with this module! How fast
> or how slow would the LFO go with just the 47n cap and no mods?
> I'd love to have it at least from around 30 seconds to almost audio.
> Will this go without mod? Curious for other cap speeds too.

Have a look on the muffwiggler.com DIY forum, and on electro-music.com
DIY forum - there's a wealth of information in there about modding the
CGS LFO.
Do a search - (you need to be logged into Muff's to do this) and all
sorts of goodies will turn up.

Short answer, wire a DPDT switch with an extra cap(s) across the timing
cap, and you can go reeeeaaallllllyyyy sssslllllloooooooowwwww.
You can get non-polarized 3.3uF caps quite cheap nowadays.....

>
> I'll only use the vari outs for now. This way all the knobs (speed,
> shape, vari) will affect the lfo, no?
> And is it still possible to trigger the cgs programmer/sequencer
> while running the LFO on 12V (80%) with a very narrow pulse/square?

Most CGS modules have comparators on their CLOCK and TRIGGER inputs, so
the answer is very probably yes :-)

cheers,
Dave

>
>
>

Great it will clock too.
Haven't found timing info on electro-music.com and muffwiggler search function seems to be out. any wild guess is welcome too. I'll have to install a resonant gate first tonight.

OK - from memory, the trick is to connect a higher value cap in
Parallel with the 47nF cap, so;
* Connect a wire from each side of the 47nF cap to each centre lug of a
DPDT toggle switch.
* Connect a larger value non polarised cap across one pair of outer
lugs. Try a 1uF or bigger.
* Leave the other outer lugs unconnected.
* OR: If you have a centre-off type DPDT switch, try connecting a
different value cap across the other outer pair, for even greater range
changes. If doing this, you might want to experiment with decreasing
the 47nF a bit for faster MAX speeds.

The 10K resistor between the wiper of the 500K SHAPE pot and pin 2 of
the TLO74 can also be increased to lower the MINIMUM speed.
For some very slow sweeps, I increased the 10K up to as much as 1M2,
and used a 1uF cap. There is a relationship between the two which can
affect the waveshape at extremes of speed - again, this is from
memory....

Lastly, changing the 4K7 to GND from the SPEED pot has an effect on MAX
speed.

Hope this helps. :-)


cheers,
Dave

That's some great info! Thanks Dave!

On 16 Oct 2012, at 22:16, Dave Kendall wrote:

> OK - from memory, the trick is to connect a higher value cap in
> Parallel with the 47nF cap, so;
> * Connect a wire from each side of the 47nF cap to each centre lug of a
> DPDT toggle switch.
> * Connect a larger value non polarised cap across one pair of outer
> lugs. Try a 1uF or bigger.
> * Leave the other outer lugs unconnected.
> * OR: If you have a centre-off type DPDT switch, try connecting a
> different value cap across the other outer pair, for even greater range
> changes. If doing this, you might want to experiment with decreasing
> the 47nF a bit for faster MAX speeds.
>
> The 10K resistor between the wiper of the 500K SHAPE pot and pin 2 of
> the TLO74 can also be increased to lower the MINIMUM speed.
> For some very slow sweeps, I increased the 10K up to as much as 1M2,
> and used a 1uF cap. There is a relationship between the two which can
> affect the waveshape at extremes of speed - again, this is from
> memory....
>
> Lastly, changing the 4K7 to GND from the SPEED pot has an effect on MAX
> speed.
>
> Hope this helps. :-)
>
>
> cheers,
> Dave
>
>
>
>
> On 16 Oct 2012, at 20:51, sirolffoonav wrote:
>
>> Great it will clock too.
>> Haven't found timing info on electro-music.com and muffwiggler search
>> function seems to be out. any wild guess is welcome too. I'll have to
>> install a resonant gate first tonight.
>>
>> --- In cgs_synth@yahoogroups.com, Dave Kendall <davekendall@...>
>> wrote:
>>>
>>> Hi.
>>>
>>> On 16 Oct 2012, at 07:54, sirolffoonav wrote:
>>>> Looking forward to handy extra modulation with this module! How
>> fast
>>>> or how slow would the LFO go with just the 47n cap and no mods?
>>>> I'd love to have it at least from around 30 seconds to almost
>> audio.
>>>> Will this go without mod? Curious for other cap speeds too.
>>>
>>> Have a look on the muffwiggler.com DIY forum, and on
>> electro-music.com
>>> DIY forum - there's a wealth of information in there about modding
>> the
>>> CGS LFO.
>>> Do a search - (you need to be logged into Muff's to do this) and all
>>> sorts of goodies will turn up.
>>>
>>> Short answer, wire a DPDT switch with an extra cap(s) across the
>> timing
>>> cap, and you can go reeeeaaallllllyyyy sssslllllloooooooowwwww.
>>> You can get non-polarized 3.3uF caps quite cheap nowadays.....
>>>
>>>>
>>>> I'll only use the vari outs for now. This way all the knobs
>> (speed,
>>>> shape, vari) will affect the lfo, no?
>>>> And is it still possible to trigger the cgs programmer/sequencer
>>>> while running the LFO on 12V (80%) with a very narrow
>> pulse/square?
>>>
>>> Most CGS modules have comparators on their CLOCK and TRIGGER
>> inputs, so
>>> the answer is very probably yes :-)
>>>
>>> cheers,
>>> Dave
>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>
>
>
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