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I also use the Jaycar DC-DC adapter and it works well
One interesting fact
I use a HP lappie, and the std 240V adapter puts out 18.5V
I looked at their DC converters ( very expensive ), but what i found in the process was the lappie will also run off 15V :-)
If you run at 18.5V, the lappie tries to recharge its batteries as well as run.
At 15V, the internal battery charger aparrently cuts out, so you dont waste energy recharging yr batteries from a battery.
Dunno how other lappies work tho
Andrew
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