> and don't want to start doing major surgery just yet.

Probably a wise precaution.

> Any suggestions for a power supply

Could be a large number of answers to that question. And in the past I've used many different types. But these days, it's almost exclusively the little 5v "Switching" power supplies left over from dead routers, USB hubs etc that seem to only last about 3-5 years. The equipment dies, but the power supplies last forever.

Not all of them are switching, and not all are 5V. But the ones that are, work perfect for everything I've needed.

They have excelent isolation, fairly good regulation (4.8-5.2V), and usually a fairly high current output compared to a Transformer type "Wall Wart" that's twice the size.

Only rule is ... Measure the voltage and polarity BEFORE connecting to anything.