[sdiy] Dual power supply solution?

[harrybissell]

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.
>
>