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

[ASSI]

On Mittwoch 07 November 2007, Gil W. wrote:
> Could the -15 regulator partially go defective, in a
> way that it blows tantalums but works fine using
> electrolytes ?

Possible, but unlikely.  If the tantalum was a 10V type, it had a 
snowflakes chance of surviving hell on a 15V regulated output.  If you 
now use a modern electrolyte with low ESR, the reason for having a 
tantalum has gone away, otherwise just additionally bypass the supply 
just after the regulator with a 100nF ceramic cap.  The rule for 
tantalums is to use them at max. 2/3 their rated voltage or even less 
than that.


Achim.
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