How do I build a 24v 8-10amp power supply?
Now I have to choose between 2 ideas:
1) bridge 2 old PSUs like in this guide
to get 0 > +12 > +24 (that would be extremely good since the vibration engine takes just 12V) but I am not sure about the "theory" of putting PSUs in series and I am concerned about the risks of grandma (main user of the chair) being fried after failures of this configuration.
2) I have scavenged a big (and heavy) 220Vac to 12Vac and 24Vac transformer... but I am not sure how many amps I can get out of it and, with my "useful" backgroud as chemist, this time I have the theory of rectifiers but I miss practice... I don't know what I should exactly look/shop for...
(in this case it would be nice to take the 12Vdc from it too but if it gets hard/expensive I can go with a "secondary" power adapter refurbished from a dead cellphone charger)