[sdiy] Prophet 5 power supply issues solved - fuse resistorfrying now

[Gil W.]

Thanks,

the power supply is new (I just built it) so I believe
this is not the problem. I did use 6800uf gilter caps
instead of the 6300uf the original used though. Could
that cause the problem you mentioned ?


 
--- Mike <profpep at hotmail.com> wrote:

> >
> > So what seemed to solve the crazy voltage problems
> and
> > tantalum shorts, was simply using higher voltage
> > tantalum caps !
> >
> > Although the ones I initially used are rated 25v,
> > it seems they still could not hold the 15v rails
> > efficiently, and simply got fried !
> >
> I haven't re-read the whole  thread, but have you
> checked the ripple level
> on these supplies. Excessive ripple will blow many
> tantalums. The prime
> cause of this could be the initial power supplt
> electrolytics having dried
> out. A ats check is to fit a known good new cap in
> parallel. If the problem
> goes away, change them out.
> 
> I have a quite nifty capacitor ESR meter from Peak
> Electronics. It will try
> and read ESR in circuit, (power off!), and is useful
> for checking suspect
> caps from the parts bin.
> 
> http://www.peakelec.co.uk/
> 
> Their other little test instruments are good too.
> 
> HTH
> 
> Mike
> 
> 
> 



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