Hello, new here, I'll try and contribute where I can but not sure how much help I can be!
I very recently bought a cheap Chinese-made bench power supply on eBay, a CC/CV 10A 30V unit with analog voltage and amperage meters
http://www.ebay.com.au/itm/191667486490There's a very good reason for how this happened, but all you need to know is that I've been trying to revive a dead SLA battery and this evening connected up the polarity wrong, providing the supply with about 11.8V with reversed polarity.
Without even turning the power supply on, the dials lit up and the supply started smoking.
Surprisingly, it seems like the power supply still works!
But if I've broken or damaged something I'd really like to replace it.
The smoke seemed to be coming from the front-right corner around the voltage/current controls, power button and possibly the relays towards the rear but the only diode there I can find seems okay, the potentiometer seems okay, no signs of exploded capacitors or leaking or burn marks or anything.
Ideas?
https://imgur.com/a/GRpdj