Cgs synth

I'm building my SuperPsycho, but having trouble finding 1meg pots that fit
my form factor (i want all 6 of the individual speed controls vertically in
a fracRack format). Could i use 100k pots, if i upped the 2 caps by a
factor of 10 (from 220nf/2.2uf to 2.2 uf/22uf)? And what abt the 4.7k
resistor in series w/ the speed pot?

BTW, pictures of my rig & various others from the Analog Heaven MidWest
gathering now available at:

http://www.ph.k12.in.us/~drew/ahmw/pics/2004/index.html

Lots of CGS modules in attendance!


thanks,

>I'm building my SuperPsycho, but having trouble finding 1meg pots that fit
>my form factor (i want all 6 of the individual speed controls vertically in
>a fracRack format). Could i use 100k pots, if i upped the 2 caps by a
>factor of 10 (from 220nf/2.2uf to 2.2 uf/22uf)? And what abt the 4.7k
>resistor in series w/ the speed pot?

You could. You would need to reduce the 4k7 to 470 ohms too.

Ken
_______________________________________________________________________
Ken Stone sasami@... or ken@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Hi all.

Easy one I hope. If using 47k LIN pots for the 6 speed controls,
would changing the caps around the speed pot to 4.7uF/47uF,
and the series resistor to 220 or 240 ohms work OK?

Also, has anyone found any magic combinations of speed
settings for the 6 lfos, or ratios between them?

TIA

Dave.


In cgs_synth@yahoogroups.com, sasami@h... wrote:

>Easy one I hope. If using 47k LIN pots for the 6 speed controls,
>would changing the caps around the speed pot to 4.7uF/47uF,
>and the series resistor to 220 or 240 ohms work OK?

Keeping the ratio whould keep the time constants the same - however as the
caps get larger, the charging load on the chip output will increase. The
chips maximum output max be exceeded, resulting in delays being longer than
expected/frequencies lower than expected. That said, it should probably work
okay, though I wouldn't want to see a lower resistance than 220R in series.

Ken

>Also, has anyone found any magic combinations of speed
>settings for the 6 lfos, or ratios between them?
>
>TIA
>
>Dave.
>
>
>In cgs_synth@yahoogroups.com, sasami@h... wrote:
>> >I'm building my SuperPsycho, but having trouble finding 1meg
>pots that fit
>> >my form factor (i want all 6 of the individual speed controls
>vertically in
>> >a fracRack format). Could i use 100k pots, if i upped the 2
>caps by a
>> >factor of 10 (from 220nf/2.2uf to 2.2 uf/22uf)? And what abt the
>4.7k
>> >resistor in series w/ the speed pot?
>>
>> You could. You would need to reduce the 4k7 to 470 ohms too.
>>
>> Ken
>>
>__________________________________________________
>_____________________
>> Ken Stone sasami@h... or ken@c...
>> Modular Synth PCBs for sale
><http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies
><http://www.blaze.net.au/~sasami/>
>
>
>
>
>
>
>See the following URLS for the CGS Modular Synth home page:
>Main: http://www.cgs.synth.net/
>Secondary: http://otherunicorn.0catch.com/synth/
>Yahoo! Groups Links
>
>
>
>
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Hi all,
Can anyone recommend a good +-15v psu similar to the motm / blacet units
available in Australia at a decent price?
I'd like to exhaust local options before ordering one from the US, and
don't feel confident building my own.

cheers,
Skye.



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Hi Skye,

I am in Australia and can supply a suitable power supply (www.elby-designs.com/power/asm2-powersupplies.pdf) built around the LM723. This comes as a kit and requires a transformer but as long as you apply some common-sense safety rules when wiring up the mains connections then it is an easy task to build yourself. If still not keen on that then I can build it for you and house it in a suitable case.
Best Regards
(Mr) Laurie Biddulph


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Software and hardware design for the Psion and Palm family of palmtop computers

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