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see above comment also there are buck converter that apply pretty much the same principles with a cap and a coil to get the same effect using DC.
The Voltage DoublerAs its name suggests, a Voltage Doubler is a voltage multiplier circuit which has a voltage multiplication factor of two. The circuit consists of only two diodes, two capacitors and an oscillating AC input voltage (a PWM waveform could also be used). This simple diode-capacitor pump circuit gives a DC output voltage equal to the peak-to-peak value of the sinusoidal input. In other words, double the peak voltage value because the diodes and the capacitors work together to effectively double the voltage.DC Voltage Doubler Circuit
Clip Indicator (LED) for any power amp
How To Build a Small Dresser
No solder nylon wrapped phone cable!
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