Hand machined mechanical pencils

Resonant charging equations (11/07/13)

Resonant charging is a neat way of efficiently charging a capacitor up to twice the supply voltage, with (theoretically) 100% efficiency (compare this with resistive charging, where the series resistor dissipates a lot of power, especially at high repetition rates). Here is a little PDF I prepared which derives the equations for charging time, peak inductor current, and peak inductor energy.