Yes, they are just random power supplies. At the moment, I have the following:

5 x 12V 500mA
1 x 9V 300mA
1 x 6V 100 mA
1 x Futaba RC TX/RX battery charger (9.6v 70mA + 4.8v 100mA with the correct connectors)

There may be a couple more kicking around somewhere, but they haven't turned up yet.

pca
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Experience is what you get just after it would have helped...