[sdiy] tongue stuck to skipole @20v

[Anthony Bisset]

Bert or Marc of synton suggested I run my fenix at 20v.. yeazzz that's
right, 20v.  I was surprised.  I know 18v is max for a lot of ic's so I
only barely pushed it over at 18.7v. Was fine.  Felt like I was taking a
risk.  Anyway, guess you can run a fenix on 20v.

I do have a Gentle Electric P/V in the serge and I'm probably most worried
about that having trouble with 15v.  Anyway the reason I'm considering
this is that A, it might increase the signal levels slightly across the
system and B, I wouldn't have to mess with a second power supply for the
Driscoll that resides in this portable setup.

-a

On Mon, 9 Apr 2007, Ken Stone wrote:

> Quite frankly, I cannot see any reason why it would not work, though for
> modules like the WAD, or that PEF with potted parts, I'd do as Cynthia
> suggests and check that those hard to get chips are capable of running at
> the higher voltage, or in the case of the latter, stay with +/-12V.
>
> CD40XX, CD45XX, MC140XX etc. CMOS chips will be fine. Op amps will be fine.
> The most "delicate" of the op-amps is the MC3401 which is only rated for
> +18V, but as it is only ever run across the positive supply, it wouldn't be
> a problem. I'm not sure they were even used in the later versions.
>
> Still, you do so AT YOUR OWN RISK.
>
> Ken
>
> >I've had success doing this on a limited basis, "up-voting" selected
> >vintage Serge PCBs,
> >but I've never done this with a whole panel before.
> >
> >I suggest that you examine each and every integrated circuit on the
> >specific Serge panel boards
> >and do diligent research by actually looking-up the spec sheet of the
> >chips that you have installed
> >to makes sure that they can handle the extra voltage.  (Each chip
> >species often has several variations
> >coded after the part number with alphabet letters and I would look at
> >these carefully to be sure.
> >
> >Instead of simply reading "TL072", you would examine the entire
> >"TL072BCD"  for example.
> >(You will probably have better luck with this with newer panels than
> >with old, do you think?)
> >
> >Also, many "15 Volt" supplies have a pair of trim pots for precise
> >adjustment and it may be
> >quite possible for you to attached a simple voltmeter to the outputs and
> >then trim them down
> >from +/-15 volts to +/-12, (thus rendering the afore mentioned question
> >rather moot).
> >
> >BTW, the Mark Godfry update/replacement for the defunct but oh so lovely
> >Gentle Electric
> >Pitch to Voltage Converter module looks pretty niffy in it's own right,
> >thanks Aaron!
> >
> >peace
> >
> >
> >Cyn
> >
> >
> >http://www.cyndustries.com/
> >
> >
> >
> >Anthony Bisset wrote:
> >> Before this happens to me, I figured I'd ask:
> >>
> >> Is there any reason I couldn't run serge at +/-15v?
> >>
> >> I'm not concerned with 1v/octave tracking.  (i prefer to tune each CV as
> >> i'm playing, it affords more interesting scales so i actually pulled all
> >> the fixed 1v/octave inputs off the front panel and tied them together at a
> >> single input for a sort of pol-pot attack, ie, when i get bored
> >> i can modulate all modules).
> >>
> >> There was some discussion of this recently indicating i might need to
> >> amplify this MEGAMULT signal, but because i'm living on the un-impeded
> >> lifestyle, does it really matter?
> >>
> >> unorthodox cheers, feet kicking mud at sky.
> >> -anthony
> >>
> >>
> >>
> >>  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
> >>
> >>
> >>> On Sat, 7 Apr 2007, bill bigrig wrote:
> >>>
> >>>
> >>>> If you are going for a pitch to control voltage
> >>>> module, go to mark.godfrey at gatech.edu. Ask for
> >>>> "ECE4803 final project". I am holding in my hand his
> >>>> design that uses a LM2917N and a quad TL084, and a
> >>>> CA3046 along with some odds and ends to make one. It
> >>>>
> >>> You can find that here
> >>>
> >>> http://users.ece.gatech.edu/~lanterma/studentprojects/
> >>>
> >>> One of these days I'll get around to posting the projects from the Fall
> >>> 2006 offering...
> >>>
> >>> - Aaron
> >>> _______________________________________________
> >>> Synth-diy mailing list
> >>> Synth-diy at dropmix.xs4all.nl
> >>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >>
> >
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>