ROG splitter blend blown cap on 18v?

[any]

Hi all,

I just completed a ROG splitter blend and it was working just fine...
But when I tried it with a 18v wallwart I blew the 47uF cap wich was rated 35 volt.
Is there a good explanation for this happening? are more components potentially damaged?
All caps I used were above 18 volt rating, so I'm kind of confused...
Help or explanation would be greatly apprieciated!

ANY

[Gringo]

Unregulated wallwarts tend to put out quite higher voltages than specified. That would explain your cap frying.

[any]

So is there a good chance I fried my TL072 IC's as well?
I'll replace the cap this evening, but is there a possibility other components are shot?
I could clearly see the cap blown off, but I hope thats the only thing that needs to be replaced...

[Paul Perry (Frostwave)]

Well, the TL072 has a max supply range of 36 volts.
Incidentally, if the input was 18v AC exactly, that gives 18 times 1.4 = 25 V rectified. Less a volt for the diode say. But as Gringo says, it might be putting out a lot more than 18.
just in case, check whether the blown cap was the right way around. (well, I know that I've had a reversed filter cap hold up for a day or so... and then... )

[any]

I've put in a new cap and it runs like it did before on 9 volts, the IC's were fine.
I put a Dunlop 18v DC power supply on it for testing, but I guess I should have measured the output first.
Especially becuase my other 18 volt wart put out 24 volts when I measured it.
The cap was orientated correctly, still don't see how a 35v rated cap would blow in that circuit... even running at 24 volts.

Would their be any advantage in running it at 18 volts anyway?
I intend to use it for bass guitar, so I thought it would give a bit more headroom.
I allready used TL072IP's so maybe 9 volts will do just fine...