[sdiy] Dual power supply solution?

[Jonathan Lutz]

Gotcha.. thanks. I am sure I will have many more questions soon :)

JON

On 6/13/05, harrybissell <harrybissell at prodigy.net> wrote:
> 
> Hi Jonathan
> 
> Yes that supply would be fine.
> 
> You can find data sheets via Google for the 7812 (try uA7812, LM7812
> etc)
> and the 7912 from manufacturers. Probably everyone has one (National
> Semi,
> ST Mircoelectronics, etc)
> 
> The esteemed Mr. Fritz makes a good point. If the designs rely on the
> power supply
> for reference voltages, you will have troubles. IMHO you will have
> troubles even
> if you use a good, stable +/-15V supply. The best thing to do is to
> hack those designs
> to eliminate the dependance on the power supply.
> 
> You will notice that designs using the power supply for references will
> interact. Turn
> up the resonance on the VCF and watch the VCOs go out of tune. This
> SHOULD not
> happen but it might. If you get screwed with this, drop a line with
> the schematic
> and we can advise you on how to improve it.
> 
> A number of the simple 'kits' have this problem. The designers must have
> a better
> supply than I do.... or I'm just too fussy... :^P
> 
> H^) harry
> 
> Jonathan Lutz wrote:
> 
> > Would a dual-output supply like this one (Power-one HBB15-1.5-A) do
> > the trick?
> > http://www.alliedelec.com/Cart/ProductDetail.asp?SKU=218-3006
> >
> > JON
> > On 6/13/05, Ian Fritz <ijfritz at earthlink.net> wrote:
> >
> > At 11:41 PM 6/12/05, Peter Grenader wrote:
> >
> >
> > >Most *will* work with a lower supply, the question is how
> > well and how much
> > >spec hack you're willing to tolerate. Critical adjustments
> > such as 1v/oct
> > >tracking, overall frequency ranges, etc will be
> > compromised.
> >
> >
> > Those *may* be compromised. Good designs use local
> > subregulation for those
> > critical voltages, so they will often work with different
> > supply voltages.
> >
> >
> 
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20050613/444adaaf/attachment.htm>