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Rajah,
sorry I did not explain properly. I did not mean piggy-backing the plugpacks I meant the regulators. Connect them together and it will double the current.
The 2.5V above the regulated voltage you state is correct. I have however managed to use a 7812 reg on a car battery before and still recieve around 12V. It may not be exactly 12V, but it is better than 14.4 on sensitive equipment. Obviously not ideal.
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