[sdiy] tongue stuck to skipole @20v

Mon Apr 9 17:45:26 CEST 2007

The Gentle Electric P/V CAN
run on +/-15V with no problems.
Just be sure of the polarity !!!

I had to repair a Gentle Electric that
I bought to study... including repair of the
potted modules. I used 15V with no ill effects.

H^) harry
>
>
>---- Original Message ----
>From: abisset at dspaudio.com
>To: sasami at hotkey.net.au
>Subject: Re: [sdiy] tongue stuck to skipole @20v
>Date: Mon, 9 Apr 2007 04:50:04 -0700 (PDT)
>
>>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
>>> >>> _______________________________________________
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>>> >
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>_____________________________________________________________________
>__
>>> 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/>
>>>
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