I have two wall wart 240 - 12 V power supplies rated at 1.3 amps and 1.2 amps. My project uses a couple of solenoid valves, relays, a 12 V pump and some fans. All these will bring peak consumption to around 1.5 amps (and the pump may pull this a little higher if working hard).
My plan was to take these two power supplies and hook them up to an LM2596 buck regulator circuit in order to increase the available current. I say LM2596 because it's the only regulator IC I have at the moment, and it seems they can be run at 'unity' 12-12 V according to the datasheet here. Considering my circuit will be well within the total final current output, are there pitfalls to this approach? I actually will have some buck/boost regulator ICs soon, so would this be preferable? Thanks!