In message om, Dave
Liquorice writes
On Sat, 28 Aug 2004 22:46:26 GMT, raden wrote:

CPC do an excellent little power supply which comes complete with 8
or 16 connectors which plug into another connector either way around
to give you about every possible permutation

That's that problem solved for the OP'r

Until he takes the device from a device needing 12v tip +ve to a
device needing 3v tip -ve without remembering to change the connector
round...

Ah, the human interface problem

If he does this, he has nobody to blame but himself

--
geoff