Low cost pure sine inverter and drill charger.

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I bought a 150w Aim Pure Sine Wave 12v/115v inverter to see if it would
run my Sears 19.2v electric drill charger without the LPF I needed with
my modified sine wave inverter. It doesn't and I will return it. The
problem seems to be that the drill charger also uses a switch mode
inverter and the two inverters interact without the LPF.
I originally posted on this topic in December under "60Hz Inductor
design".
Dick