I have two 9 V, 300 mA wallwarts and would like to connect them in series to produce +9 V, 0 V and -9 V. This can be done with two 9 V batteries (as seen below), but can I do this with two non-identical wallwarts?
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being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from a...
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