My 12V wall adapter blew up last week in a power surge and have been rather reluctant to buy a new one since they cost a bit of money that I don't have. After digging through my draw of infinite cables, mainly consisting of cheap and partially cracked <200ma 12/6/9V adapters I came across a nice 9V AC adapter that offered 1A... Two problems:
1) Its an AC-AC adapter, but nothing a bridge rectifier can't fix, so not much of a problem.
2) Unfortuantely it doesn't output enough voltage (I need 12), anybody got a circuit to beef up the voltage to 12V?
I want to use this to power a small bench power supply with 5 and 12V and don't want to play around with a 240/12V transformer or extremely weak <200ma 12V wall plugs, the 5Vs is easy to acheive but I'm not sure how to get 12V from 9V.