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+1 on Isolation transformer. Any of the voltage multiplier would the entire circuit "hot". i.e. touch 1 terminal would be sufficient to cause current flow to earth ground.
Since OP is on a budget (at least from previous thread), the cheap way for doing that is look for 2 similar sized AC transformers with similar specs. The bigger/heavier you can find, the better. We all have tons of those from old stuff lying around from old AC adapters to old electronics. Some old voice or fax modems have AC outputs. New switch mode power supplies are not suitable for this.
Connect the two such that the first one gives you 12V AC for example, then feed the 12V AC into the secondary side of the 2nd transformer so that you'll get 120V back out the primary side. 120V :12V -> 12V:120V
If one is bigger than the other, use the bigger one for the AC outlet.
What this buy you is that this 120V from the 2nd transformer is now isolated (twice!) from the wall.
Con: This is not the most efficient and the transformer will run a bit hot. This also means that it is low duty cycle and not suitable for permanent attaching to the wall. The sizes of the transformer limits the amount of power you can have.
Pro: This also limits the charging current as a side effect. If you are using an unmodified power adapter with proper safety certification to connect to the AC outlet, this arrangement won't void your home insurance unlike other uncertified home made circuits that you connect to 120V directly.
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
If you are using a half wave voltage doubler, which is what I would recomend having used it extensively to charge caps, you don't need to have non polarized capacitors. The capacitors are never subjected to a negative voltage so there is no need for them to be non polarized. This is the circuit I am talking about: The positive terminal is the one on top, the negative is the one on the bottom. The positive leg of the top capacitor goes to positive, the negative leg of the bottom capacitor goes to negative. Pretty simple.
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Best circuit for getting 300ish VDC from 120VAC (wall outlet)?
