On 31 Oct 2010, at 22:11, Tony Rolando wrote:

>
> On 10/31/10 2:32 PM, Florian Anwander wrote:
> >
> > Hi Guy
> >
> > > the first things to go are the electrolytic (or tantalum) caps
> > > near the power connector.
> > Doepfer uses 25V caps ... it doubt they would be destroyed by wrong
> >
>

I agree that electrolytes don't blow as fast as tantalums.
The latter ones I've seen blowing skyhigh with reversed power.
Still, if there's burn markings, chances are it's from a cap.

Personally I use 35V or 50V electro's on a -/+12V rail.
25V is a bit too close for comfort for me.
My rule of thumb is twice the rail plus 2 or 3V minimum.

To be on the safe side, I'd prefer checking the area around
the power connector first, before starting to swap IC's at random.
Or at least, remove the IC's from their sockets, and measure
the power pins of those first.

_g

> I second other recommendations to swap those IC, esp. if socketed, it is
> really easy and fast. 25V cap would not likely be destroyed by reverse
> power.
>
> Tony
>
> [Non-text portions of this message have been removed]
>
>