This circuit was designed with the purpose of feeding a particular circuit from the USB port, of course feed the circuit did not require much current, it was utilized by the voltage doubler and no other inducers . The circuit is very basic, consists of an oscillator based on the timer 555, and a voltage doubler designed based on the multiplier voltage diodes and capacitors. the same due to its low frequency requires high-capacity capacitors also going to provide a current of about 15mA, of course you can change, but the 555 should be replaced by a two-transistor oscillator power or a power oscillator and capacitors should be changed. While this circuit doubles the voltage bone the doubles, it is possible to triple or multiply by higher values, just keep adding stages of multiplication (Didos / capacitors). The circuit is as follows.
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