Phatboy PSU polarity

[Low]

Got a couple of psu's lying around to power a Phatboy, but they are both different. One is + inside/ - negative outside, the other is - inside/ + outside.
Can someone confirm the correct polarity for me please, thanks.

 

[altitude909]

if it's an ac to ac then it wont matter, look on the back and it will tell you (i.e. 115 input/ 12 vac out)

 

[Low]

It's DC not AC.

Input - 9v DC, but on the Phatboy it doesn't show the polarity.

 

[altitude909]

i would try the tip positive. U can always crack it open and look

 

[Low]

i would try the tip positive. U can always crack it open and look

Opened it up about a month ago and it's not obvious, no board markings - can't remember what the two components are that the + and - inputs go into first.

 

[altitude909]

just look at which one connects to the ground plane, that will be the -

 

[Low]

Cheers, I'll take a look.