[sdiy] Prophet 5 -15v rail is shorting... Need advice

[Gil W.]

Emberrasing to admit, but I think I don't have the
ground wired either to the wall outlet nor to the
synth body... Could the lack of such grounding both 
defect the tantalum filtering the -15v rail of the
main board, and defect some parts on the voice board ?

I think might be doing wrong by trying to build a
power supply unit with no oscilloscope tests....

Does anyone have a pre-built Prophet 5 power supply
for sale ??






--- "Roy J. Tellason" <rtellason at verizon.net> wrote:

> On Friday 09 November 2007 23:01, Gil W. wrote:
> > NEWS:
> >
> > I finally managed to locate a heating MC14016
> chip,
> > took it out and got stable +14.80v for five
> minutes.
> >
> > Then, suddenly to voltage dropped again !!
> >
> > Am I doing any wrong ? I'm currently running the
> voice
> > board without the CEM and CA chips, to avoid
> ruining
> > them. Is that safe ?
> >
> > I can't see why ICs will get defected so easily. I
> > first thought that the 14016 sponteneouly went
> bad,
> > but now I have the feeling that something knocks
> them
> > up !!
> 
> Overvoltage will kill those,  if the previous power
> supply had gone bad that 
> way...
> 
> I sure hope for your sake that a lot of that stuff
> is socketed!  :-)
> 
> -- 
> Member of the toughest, meanest, deadliest, most
> unrelenting -- and
> ablest -- form of life in this section of space,  a
> critter that can
> be killed but can't be tamed.  --Robert A. Heinlein,
> "The Puppet Masters"
> -
> Information is more dangerous than cannon to a
> society ruled by lies. --James 
> M Dakin
> 
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> 


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